twomass_psc
The 2MASS Point Source catalogue of 470,992,970 sources.
ra
(ra) Right ascension (J2000)
deg
pos.eq.ra;meta.maindouble
decl
(dec) Declination (J2000)
deg
pos.eq.dec;meta.maindouble
err_maj
(err_maj) Major axis of position error ellipse
arcsec
stat.errordouble
err_min
(err_min) Minor axis of position error ellipse
arcsec
stat.errordouble
err_ang
[0,180] (err_ang) Position angle of error ellipse major axis (E of N)
deg
stat.errorint
designation
(designation) Source designation
char
meta.id;meta.mainchar
j_m
(j_m) J selected default magnitude
mag
phot.mag;em.IR.Jdouble
j_cmsig
(j_cmsig) J default magnitude uncertainty
mag
stat.error;phot.magdouble
j_msigcom
(j_msigcom) J total magnitude uncertainty
mag
stat.error;phot.mag;em.IR.Jdouble
j_snr
(j_snr) J Signal-to-noise ratio
mag
stat.snrdouble
h_m
(h_m) H selected default magnitude
mag
phot.mag;em.IR.Hdouble
h_cmsig
(h_cmsig) H default magnitude uncertainty
mag
stat.error;phot.magdouble
h_msigcom
(h_msigcom) H total magnitude uncertainty
mag
stat.error;phot.mag;em.IR.Hdouble
h_snr
(h_snr) H Signal-to-noise ratio
mag
stat.snrdouble
k_m
(k_m) K selected default magnitude
mag
phot.mag;em.IR.Kdouble
k_cmsig
(k_cmsig) K default magnitude uncertainty
mag
stat.error;phot.magdouble
k_msigcom
(k_msigcom) K total magnitude uncertainty
mag
stat.error;phot.mag;em.IR.Kdouble
k_snr
(k_snr) K Signal-to-noise ratio
mag
stat.snrdouble
ph_qual
(ph_qual) JHK Photometric quality flag
meta.code.qual;photchar
rd_flg
(rd_flg) Source of JHK default mag
meta.refchar
bl_flg
(bl_flg) JHK components fit to source
meta.codechar
cc_flg
(cc_flg) Artifact contamination, confusion
meta.codechar
ndet
[0-9] (ndet) Number of aperture measurements (jjhhkk)
meta.numberchar
prox
Distance between source and nearest neighbour
arcsec
pos.angDistancedouble
pxpa
(pxpa) Position angle of vector from source to nearest neighbour (E of N)
deg
pos.posAngint
pxcntr
(pxcntr) Sequence number of nearest neighbour
meta.numberint
gal_contam
[0,2] (gal_contam) Extended source contamination
meta.codeint
mp_flg
[0,1] (mp_flg) Association with asteroid or comet
meta.codeint
pts_key
(pts_key) Unique source identifier in catalogue
meta.id;meta.tableint
hemis
[ns] (hemis) Hemisphere of observation
obs.param;obschar
date
(date) Observation date
time.epoch;obschar
scan
(scan) Scan number (within date)
obs.fieldint
glon
(glon) Galactic longitude
deg
os.galactic.londouble
glat
(glat) Galactic latitude
deg
pos.galactic.latdouble
x_scan
(x_scan) Distance of source from focal plane centerline
arcsec
pos.cartesian;instr.detdouble
jdate
(jdate) Julian date of source measurement
Julian days
time.epochdouble
j_psfchi
(j_psfchi) J band reduced chi2 value of fit
mag
stat.fit.chi2;stat.valuedouble
h_psfchi
(h_psfchi) H band reduced chi2 value of fit
mag
stat.fit.chi2;stat.valuedouble
k_psfchi
(k_psfchi) K band reduced chi2 value of fit
mag
stat.fit.chi2;stat.valuedouble
j_m_stdap
(jmstdap) J standard aperture magnitude
mag
phot.mag;em.IR.Jdouble
j_msig_stdap
(jmsigstdap) error on Jstdap
mag
stat.errordouble
h_m_stdap
(hmstdap) H standard aperture magnitude
mag
phot.mag;em.IR.Hdouble
h_msig_stdap
(hmsigstdap) error on Hstdap
mag
stat.errordouble
k_m_stdap
(kmstdap) K standard aperture magnitude
mag
phot.mag;em.IR.Kdouble
k_msig_stdap
(kmsigstdap) error on Kstdap
mag
stat.errordouble
dist_edge_ns
(distedgens) Distance from the source to the nearest North or South scan edge
arcsec
pos;arith.diffint
dist_edge_ew
(distedgeew) Distance from the source to the nearest East or West scan edge
arcsec
pos;arith.diffint
dist_edge_flg
(distedgeflg) flag indicating to which edges the edgeNS and edgeEW values refer
pos.cartesian;instr.detchar
dup_src
(dup_src) Flag indicating duplicate source
meta.codeint
use_src
(use_src) Use source flag
meta.codeint
a
(a) Associated optical source
meta.id;meta.datasetchar
dist_opt
(dist_opt) Distance to associated optical source
arcsec
pos.angDistancedouble
phi_opt
[0,360] (phi_opt) position angle from optical source to the 2MASS source position
deg
pos.posAngint
b_m_opt
(bmopt) Blue magnitude of associated optical source
mag
phot.mag;em.opt.Bdouble
vr_m_opt
(vrmopt) Visual or red mag of associated optical source
mag
phot.mag;em.opt.Rdouble
nopt_mchs
(nopt_mchs) Number of optical sources within 5arcsec
meta.numberint
ext_key
(ext_key) Record Identifier in XSC
meta.id.crossint
scan_key
(scan_key) Record Identifier in the Scan Information Table
meta.idint
coadd_key
(coadd_key) Record Identifier in the Atlas Image Data Table
meta.id;meta.datasetint
coadd
(coadd) Sequence number of the Atlas Image
meta.numberint
twomass_xsc
The XSC contains 389 columns of information per source (most of which is
photometry.) Because extended sources are much more complicated than a
point source, it takes many more parameters to characterize them. Some
parameters are required to describe the spatial extent of a source, and
many more are required to characterize the photometry. In addition to a
number of standard measures of photometry, the xsc also reports the
magnitude as measured in a number of different fixed-size apertures.
The table is organized according to the broad function and utility
of the parameters: Name and Position Information, Standard Photometry
and Orientation, Large Aperture Photometry, and Miscellaneous Photometry
and Characterization.
jdate
Julian date of the source measurement accurate to +-3 minutes.
Julian days
double
designation
Source designation formed from sexigesimal coordinates.
char
ra
Right ascension (J2000 decimal deg) based on peak pixel.
deg
double
decl
Declination (J2000 decimal deg) based on peak pixel.
deg
double
sup_ra
Super-coadd centroid RA (J2000 decimal deg).
deg
double
sup_dec
Super-coadd centroid Dec (J2000 decimal deg).
deg
double
glon
Galactic longitude (decimal deg) based on peak pixel.
deg
double
glat
Galactic latitude (decimal deg) based on peak pixel.
deg
double
density
Coadd log(density) of stars with k lover 14 mag.
double
r_k20fe
20mag/sq." isophotal K fiducial ell. ap. semi-major axis.
arcsec
double
j_m_k20fe
J 20mag/sq." isophotal fiducial ell. ap. magnitude.
mag
double
j_msig_k20fe
J 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
mag
double
j_flg_k20fe
J confusion flag for 20mag/sq." iso. fid. ell. mag.
int
h_m_k20fe
H 20mag/sq." isophotal fiducial ell. ap. magnitude.
mag
double
h_msig_k20fe
H 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag.
mag
double
h_flg_k20fe
H confusion flag for 20mag/sq." iso. fid. ell. mag.
int
k_m_k20fe
K 20mag/sq." isophotal fiducial ell. ap. magnitude.
mag
double
k_msig_k20fe
K 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag
mag
double
k_flg_k20fe
K 1-sigma uncertainty in 20mag/sq." iso.fid.ell.mag
int
r_3sig
3-sigma K isophotal semi-major axis.
arcsec
double
j_ba
J minor/major axis ratio fit to the 3-sigma isophote.
double
j_phi
J angle to 3-sigma major axis (E of N).
int
h_ba
H minor/major axis ratio fit to the 3-sigma isophote.
double
h_phi
H angle to 3-sigma major axis (E of N).
int
k_ba
K minor/major axis ratio fit to the 3-sigma isophote.
double
k_phi
K angle to 3-sigma major axis (E of N).
int
sup_r_3sig
Super-coadd 3-sigma isophotal semi-major axis radius.
arcsec
double
sup_ba
Minor/major axis ratio fit to 3-sig. super-coadd isophote.
double
sup_phi
Super-coadd angle to major axis (E of N).
deg
int
r_fe
K fiducial Kron elliptical aperture semi-major axis.
arcsec
double
j_m_fe
J fiducial Kron ell. mag aperture magnitude.
mag
double
j_msig_fe
J 1-sigma uncertainty in fiducial Kron ell. mag.
mag
double
j_flg_fe
J confusion flag for fiducial Kron ell. mag.
int
h_m_fe
H fiducial Kron ell. mag aperture magnitude.
mag
double
h_msig_fe
H 1-sigma uncertainty in fiducial Kron ell. mag.
mag
double
h_flg_fe
H confusion flag for fiducial Kron ell. mag.
int
k_m_fe
K fiducial Kron ell. mag aperture magnitude.
mag
double
k_msig_fe
K 1-sigma uncertainty in fiducial Kron ell. mag.
mag
double
k_flg_fe
K confusion flag for fiducial Kron ell. mag.
int
r_ext
extrapolation/total radius.
arcsec
double
j_m_ext
J mag from fit extrapolation.
mag
double
j_msig_ext
J 1-sigma uncertainty in mag from fit extrapolation.
mag
double
j_pchi
J chi^2 of fit to rad. profile (LCSB: alpha scale len).
double
h_m_ext
H mag from fit extrapolation.
mag
double
h_msig_ext
H 1-sigma uncertainty in mag from fit extrapolation.
mag
double
h_pchi
H chi^2 of fit to rad. profile (LCSB: alpha scale len).
double
k_m_ext
K mag from fit extrapolation.
mag
double
k_msig_ext
K 1-sigma uncertainty in mag from fit extrapolation.
mag
double
k_pchi
K chi^2 of fit to rad. profile (LCSB: alpha scale len).
double
j_r_eff
J half-light (integrated half-flux point) radius.
arcsec
double
j_mnsurfb_eff
J mean surface brightness at the half-light radius.
mag
double
h_r_eff
H half-light (integrated half-flux point) radius.
arcsec
double
h_mnsurfb_eff
H mean surface brightness at the half-light radius.
mag
double
k_r_eff
K half-light (integrated half-flux point) radius.
arcsec
double
k_mnsurfb_eff
K mean surface brightness at the half-light radius.
mag
double
j_con_indx
J concentration index r_75%/r_25%.
double
h_con_indx
H concentration index r_75%/r_25%.
double
k_con_indx
K concentration index r_75%/r_25%.
double
j_peak
J peak pixel brightness.
mag
double
h_peak
H peak pixel brightness
mag
double
k_peak
K peak pixel brightness.
mag
double
j_5surf
J central surface brightness (r lover or =5).
mag
double
h_5surf
H central surface brightness (r lover or =5).
mag
double
k_5surf
K central surface brightness (r lover or =5).
mag
double
e_score
extended score: 1(extended) lover e_score and lover 2(point-like).
double
g_score
galaxy score: 1(extended) lover g_score and lover 2(point-like).
double
vc
visual verification score for source.
int
cc_flg
indicates artifact contamination and/or confusion.
char
im_nx
size of postage stamp image in pixels.
int
r_k20fc
20mag/sq." isophotal K fiducial circular ap. radius.
arcsec
double
j_m_k20fc
J 20mag/sq." isophotal fiducial circ. ap. mag.
mag
double
j_msig_k20fc
J 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
mag
double
j_flg_k20fc
J confusion flag for 20mag/sq." iso. fid. circ. mag.
int
h_m_k20fc
H 20mag/sq." isophotal fiducial circ. ap. mag.
mag
double
h_msig_k20fc
H 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
mag
double
h_flg_k20fc
H confusion flag for 20mag/sq." iso. fid. circ. mag.
int
k_m_k20fc
K 20mag/sq." isophotal fiducial circ. ap. mag.
mag
double
k_msig_k20fc
K 1-sigma uncertainty in 20mag/sq." iso.fid.circ. mag.
mag
double
k_flg_k20fc
K confusion flag for 20mag/sq." iso. fid. circ. mag.
int
j_r_e
J Kron elliptical aperture semi-major axis.
arcsec
double
j_m_e
J Kron elliptical aperture magnitude.
mag
double
j_msig_e
J 1-sigma uncertainty in Kron elliptical mag.
mag
double
j_flg_e
J confusion flag for Kron elliptical mag.
int
h_r_e
H Kron elliptical aperture semi-major axis.
arcsec
double
h_m_e
H Kron elliptical aperture magnitude.
mag
double
h_msig_e
H 1-sigma uncertainty in Kron elliptical mag.
mag
double
h_flg_e
H confusion flag for Kron elliptical mag.
int
k_r_e
K Kron elliptical aperture semi-major axis.
arcsec
double
k_m_e
K Kron elliptical aperture magnitude.
mag
double
k_msig_e
K 1-sigma uncertainty in Kron elliptical mag.
mag
double
k_flg_e
K confusion flag for Kron elliptical mag.
int
j_r_c
J Kron circular aperture radius.
arcsec
double
j_m_c
J Kron circular aperture magnitude.
mag
double
j_msig_c
J 1-sigma uncertainty in Kron circular mag.
mag
double
j_flg_c
J confusion flag for Kron circular mag.
int
h_r_c
H Kron circular aperture radius.
arcsec
double
h_m_c
H Kron circular aperture magnitude.
mag
double
h_msig_c
H 1-sigma uncertainty in Kron circular mag.
mag
double
h_flg_c
H confusion flag for Kron circular mag.
int
k_r_c
K Kron circular aperture radius.
arcsec
double
k_m_c
K Kron circular aperture magnitude.
mag
double
k_msig_c
K 1-sigma uncertainty in Kron circular mag.
mag
double
k_flg_c
K confusion flag for Kron circular mag.
int
r_fc
K fiducial Kron circular aperture radius.
arcsec
double
j_m_fc
J fiducial Kron circular magnitude.
mag
double
j_msig_fc
J 1-sigma uncertainty in fiducial Kron circ. mag.
mag
double
j_flg_fc
J confusion flag for fiducial Kron circ. mag.
int
h_m_fc
H fiducial Kron circular magnitude.
mag
double
h_msig_fc
H 1-sigma uncertainty in fiducial Kron circ. mag.
mag
double
h_flg_fc
H confusion flag for fiducial Kron circ. mag.
int
k_m_fc
K fiducial Kron circular magnitude.
mag
double
k_msig_fc
K 1-sigma uncertainty in fiducial Kron circ. mag.
mag
double
k_flg_fc
K confusion flag for fiducial Kron circ. mag.
int
j_r_i20e
J 20mag/sq." isophotal elliptical ap. semi-major axis.
arcsec
double
j_m_i20e
J 20mag/sq." isophotal elliptical ap. magnitude.
mag
double
j_msig_i20e
J 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
mag
double
j_flg_i20e
J confusion flag for 20mag/sq." iso. ell. mag.
int
h_r_i20e
H 20mag/sq." isophotal elliptical ap. semi-major axis.
arcsec
double
h_m_i20e
H 20mag/sq." isophotal elliptical ap. magnitude.
mag
double
h_msig_i20e
H 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
mag
double
h_flg_i20e
H confusion flag for 20mag/sq." iso. ell. mag.
int
k_r_i20e
K 20mag/sq." isophotal elliptical ap. semi-major axis.
arcsec
double
k_m_i20e
K 20mag/sq." isophotal elliptical ap. magnitude.
mag
double
k_msig_i20e
K 1-sigma uncertainty in 20mag/sq." iso. ell. mag.
mag
double
k_flg_i20e
K confusion flag for 20mag/sq." iso. ell. mag.
int
j_r_i20c
J 20mag/sq." isophotal circular aperture radius.
arcsec
double
j_m_i20c
J 20mag/sq." isophotal circular ap. magnitude.
mag
double
j_msig_i20c
J 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
mag
double
j_flg_i20c
J confusion flag for 20mag/sq." iso. circ. mag.
int
h_r_i20c
H 20mag/sq." isophotal circular aperture radius.
arcsec
double
h_m_i20c
H 20mag/sq." isophotal circular ap. magnitude.
mag
double
h_msig_i20c
H 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
mag
double
h_flg_i20c
H confusion flag for 20mag/sq." iso. circ. mag.
int
k_r_i20c
K 20mag/sq." isophotal circular aperture radius.
arcsec
double
k_m_i20c
K 20mag/sq." isophotal circular ap. magnitude.
mag
double
k_msig_i20c
K 1-sigma uncertainty in 20mag/sq." iso. circ. mag.
mag
double
k_flg_i20c
K confusion flag for 20mag/sq." iso. circ. mag.
int
j_r_i21e
J 21mag/sq." isophotal elliptical ap. semi-major axis.
arcsec
double
j_m_i21e
J 21mag/sq." isophotal elliptical ap. magnitude.
mag
double
j_msig_i21e
J 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
mag
double
j_flg_i21e
J confusion flag for 21mag/sq." iso. ell. mag.
int
h_r_i21e
H 21mag/sq." isophotal elliptical ap. semi-major axis.
arcsec
double
h_m_i21e
H 21mag/sq." isophotal elliptical ap. magnitude.
mag
double
h_msig_i21e
H 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
mag
double
h_flg_i21e
H confusion flag for 21mag/sq." iso. ell. mag.
int
k_r_i21e
K 21mag/sq." isophotal elliptical ap. semi-major axis.
arcsec
double
k_m_i21e
K 21mag/sq." isophotal elliptical ap. magnitude.
mag
double
k_msig_i21e
K 1-sigma uncertainty in 21mag/sq." iso. ell. mag.
mag
double
k_flg_i21e
K confusion flag for 21mag/sq." iso. ell. mag.
int
r_j21fe
21mag/sq." isophotal J fiducial ell. ap. semi-major axis.
arcsec
double
j_m_j21fe
J 21mag/sq." isophotal fiducial ell. ap. magnitude.
mag
double
j_msig_j21fe
J 21mag/sq." isophotal fiducial ell. ap. magnitude.
mag
double
j_flg_j21fe
J confusion flag for 21mag/sq." iso. fid. ell. mag.
int
h_m_j21fe
H 21mag/sq." isophotal fiducial ell. ap. magnitude.
mag
double
h_msig_j21fe
H 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
mag
double
h_flg_j21fe
H confusion flag for 21mag/sq." iso. fid. ell. mag.
int
k_m_j21fe
K 21mag/sq." isophotal fiducial ell. ap. magnitude.
mag
double
k_msig_j21fe
K 1-sigma uncertainty in 21mag/sq." iso.fid.ell.mag.
mag
double
k_flg_j21fe
K confusion flag for 21mag/sq." iso. fid. ell. mag.
int
j_r_i21c
J 21mag/sq." isophotal circular aperture radius.
arcsec
double
j_m_i21c
J 21mag/sq." isophotal circular ap. magnitude.
mag
double
j_msig_i21c
J 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
mag
double
j_flg_i21c
J confusion flag for 21mag/sq." iso. circ. mag.
int
h_r_i21c
H 21mag/sq." isophotal circular aperture radius.
arcsec
double
h_m_i21c
H 21mag/sq." isophotal circular ap. magnitude.
mag
double
h_msig_i21c
H 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
mag
double
h_flg_i21c
H confusion flag for 21mag/sq." iso. circ. mag.
int
k_r_i21c
K 21mag/sq." isophotal circular aperture radius.
arcsec
double
k_m_i21c
K 21mag/sq." isophotal circular ap. magnitude.
mag
double
k_msig_i21c
K 1-sigma uncertainty in 21mag/sq." iso. circ. mag.
mag
double
k_flg_i21c
K confusion flag for 21mag/sq." iso. circ. mag.
int
r_j21fc
21mag/sq." isophotal J fiducial circular ap. radius.
arcsec
double
j_m_j21fc
J 21mag/sq." isophotal fiducial circ. ap. mag.
mag
double
j_msig_j21fc
J 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
mag
double
j_flg_j21fc
J confusion flag for 21mag/sq." iso. fid. circ. mag.
int
h_m_j21fc
J confusion flag for 21mag/sq." iso. fid. circ. mag.
mag
double
h_msig_j21fc
H 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
mag
double
h_flg_j21fc
int
k_m_j21fc
H confusion flag for 21mag/sq." iso. fid. circ. mag.
mag
double
k_msig_j21fc
K 1-sigma uncertainty in 21mag/sq." iso.fid.circ.mag.
mag
double
k_flg_j21fc
K confusion flag for 21mag/sq." iso. fid. circ. mag.
int
j_m_5
J 5 arcsec radius circular aperture magnitude.
mag
double
j_msig_5
J 1-sigma uncertainty in 5 arcsec circular ap. mag.
mag
double
j_flg_5
J confusion flag for 5 arcsec circular ap. mag.
int
h_m_5
H 5 arcsec radius circular aperture magnitude.
mag
double
h_msig_5
H 1-sigma uncertainty in 5 arcsec circular ap. mag.
mag
double
h_flg_5
H confusion flag for 5 arcsec circular ap. mag.
int
k_m_5
K 5 arcsec radius circular aperture magnitude.
mag
double
k_msig_5
K 1-sigma uncertainty in 5 arcsec circular ap. mag.
mag
double
k_flg_5
K confusion flag for 5 arcsec circular ap. mag.
int
j_m_7
J 7 arcsec radius circular aperture magnitude.
mag
double
j_msig_7
J 1-sigma uncertainty in 7 arcsec circular ap. mag.
mag
double
j_flg_7
J confusion flag for 7 arcsec circular ap. mag.
int
h_m_7
H 7 arcsec radius circular aperture magnitude.
mag
double
h_msig_7
H 1-sigma uncertainty in 7 arcsec circular ap. mag.
mag
double
h_flg_7
H confusion flag for 7 arcsec circular ap. mag.
int
k_m_7
K 7 arcsec radius circular aperture magnitude.
mag
double
k_msig_7
K 1-sigma uncertainty in 7 arcsec circular ap. mag.
mag
double
k_flg_7
K confusion flag for 7 arcsec circular ap. mag.
int
j_m_10
J 10 arcsec radius circular aperture magnitude.
mag
double
j_msig_10
J 1-sigma uncertainty in 10 arcsec circular ap. mag.
mag
double
j_flg_10
J confusion flag for 10 arcsec circular ap. mag.
int
h_m_10
H 10 arcsec radius circular aperture magnitude.
mag
double
h_msig_10
H 1-sigma uncertainty in 10 arcsec circular ap. mag.
mag
double
h_flg_10
H confusion flag for 10 arcsec circular ap. mag.
int
k_m_10
K 10 arcsec radius circular aperture magnitude.
mag
double
k_msig_10
K 1-sigma uncertainty in 10 arcsec circular ap. mag.
mag
double
k_flg_10
K confusion flag for 10 arcsec circular ap. mag.
int
j_m_15
J 15 arcsec radius circular aperture magnitude.
mag
double
j_msig_15
J 15 arcsec radius circular aperture magnitude.
mag
double
j_flg_15
J confusion flag for 15 arcsec circular ap. mag.
int
h_m_15
H 15 arcsec radius circular aperture magnitude.
mag
double
h_msig_15
H 1-sigma uncertainty in 15 arcsec circular ap. mag.
mag
double
h_flg_15
H confusion flag for 15 arcsec circular ap. mag.
int
k_m_15
K 15 arcsec radius circular aperture magnitude.
mag
double
k_msig_15
K 1-sigma uncertainty in 15 arcsec circular ap. mag.
mag
double
k_flg_15
K confusion flag for 15 arcsec circular ap. mag.
int
j_m_20
J 20 arcsec radius circular aperture magnitude.
mag
double
j_msig_20
J 1-sigma uncertainty in 20 arcsec circular ap. mag.
mag
double
j_flg_20
J confusion flag for 20 arcsec circular ap. mag.
int
h_m_20
H 20 arcsec radius circular aperture magnitude.
mag
double
h_msig_20
H 1-sigma uncertainty in 20 arcsec circular ap. mag.
mag
double
h_flg_20
H confusion flag for 20 arcsec circular ap. mag.
int
k_m_20
K 20 arcsec radius circular aperture magnitude.
mag
double
k_msig_20
K 1-sigma uncertainty in 20 arcsec circular ap. mag.
mag
double
k_flg_20
K confusion flag for 20 arcsec circular ap. mag.
int
j_m_25
J 25 arcsec radius circular aperture magnitude.
mag
double
j_msig_25
J 1-sigma uncertainty in 25 arcsec circular ap. mag.
mag
double
j_flg_25
J confusion flag for 25 arcsec circular ap. mag.
int
h_m_25
H 25 arcsec radius circular aperture magnitude.
mag
double
h_msig_25
H 1-sigma uncertainty in 25 arcsec circular ap. mag.
mag
double
h_flg_25
H confusion flag for 25 arcsec circular ap. mag.
int
k_m_25
K 25 arcsec radius circular aperture magnitude.
mag
double
k_msig_25
K 1-sigma uncertainty in 25 arcsec circular ap. mag.
mag
double
k_flg_25
K confusion flag for 25 arcsec circular ap. mag.
int
j_m_30
J 30 arcsec radius circular aperture magnitude.
mag
double
j_msig_30
J 1-sigma uncertainty in 30 arcsec circular ap. mag.
mag
double
j_flg_30
J confusion flag for 30 arcsec circular ap. mag.
int
h_m_30
H 30 arcsec radius circular aperture magnitude.
mag
double
h_msig_30
H 1-sigma uncertainty in 30 arcsec circular ap. mag.
mag
double
h_flg_30
H confusion flag for 30 arcsec circular ap. mag.
int
k_m_30
K 30 arcsec radius circular aperture magnitude.
mag
double
k_msig_30
K 1-sigma uncertainty in 30 arcsec circular ap. mag.
mag
double
k_flg_30
K confusion flag for 30 arcsec circular ap. mag.
int
j_m_40
J 40 arcsec radius circular aperture magnitude.
mag
double
j_msig_40
J 1-sigma uncertainty in 40 arcsec circular ap. mag.
mag
double
j_flg_40
J confusion flag for 40 arcsec circular ap. mag.
int
h_m_40
H 40 arcsec radius circular aperture magnitude.
mag
double
h_msig_40
H 1-sigma uncertainty in 40 arcsec circular ap. mag.
mag
double
h_flg_40
H confusion flag for 40 arcsec circular ap. mag.
int
k_m_40
K 40 arcsec radius circular aperture magnitude.
mag
double
k_msig_40
K 1-sigma uncertainty in 40 arcsec circular ap. mag.
mag
double
k_flg_40
K confusion flag for 40 arcsec circular ap. mag.
int
j_m_50
J 50 arcsec radius circular aperture magnitude.
mag
double
j_msig_50
J 1-sigma uncertainty in 50 arcsec circular ap. mag.
mag
double
j_flg_50
J confusion flag for 50 arcsec circular ap. mag.
int
h_m_50
H 50 arcsec radius circular aperture magnitude.
mag
double
h_msig_50
H 1-sigma uncertainty in 50 arcsec circular ap. mag.
mag
double
h_flg_50
H confusion flag for 50 arcsec circular ap. mag.
int
k_m_50
K 50 arcsec radius circular aperture magnitude.
mag
double
k_msig_50
K 1-sigma uncertainty in 50 arcsec circular ap. mag.
mag
double
k_flg_50
K confusion flag for 50 arcsec circular ap. mag.
int
j_m_60
J 60 arcsec radius circular aperture magnitude.
mag
double
j_msig_60
J 1-sigma uncertainty in 60 arcsec circular ap. mag.
mag
double
j_flg_60
J confusion flag for 60 arcsec circular ap. mag.
int
h_m_60
H 60 arcsec radius circular aperture magnitude.
mag
double
h_msig_60
H 1-sigma uncertainty in 60 arcsec circular ap. mag.
mag
double
h_flg_60
H confusion flag for 60 arcsec circular ap. mag.
int
k_m_60
K 60 arcsec radius circular aperture magnitude.
mag
double
k_msig_60
K 1-sigma uncertainty in 60 arcsec circular ap. mag.
mag
double
k_flg_60
K confusion flag for 60 arcsec circular ap. mag.
int
j_m_70
J 70 arcsec radius circular aperture magnitude.
mag
double
j_msig_70
J 1-sigma uncertainty in 70 arcsec circular ap. mag.
mag
double
j_flg_70
J confusion flag for 70 arcsec circular ap. mag.
int
h_m_70
H 70 arcsec radius circular aperture magnitude.
mag
double
h_msig_70
H 1-sigma uncertainty in 70 arcsec circular ap. mag.
mag
double
h_flg_70
H confusion flag for 70 arcsec circular ap. mag.
int
k_m_70
K 70 arcsec radius circular aperture magnitude.
mag
double
k_msig_70
K 1-sigma uncertainty in 70 arcsec circular ap. mag
mag
double
k_flg_70
K confusion flag for 70 arcsec circular ap. mag.
int
j_m_sys
J system photometry magnitude.
mag
double
j_msig_sys
J 1-sigma uncertainty in system photometry mag.
mag
double
h_m_sys
H system photometry magnitude.
mag
double
h_msig_sys
H 1-sigma uncertainty in system photometry mag.
mag
double
k_m_sys
K system photometry magnitude.
mag
double
k_msig_sys
K 1-sigma uncertainty in system photometry mag.
mag
double
sys_flg
system flag: 0=no system, 1=nearby galaxy flux incl. in mag.
int
contam_flg
contamination flag: 0=no stars, 1=stellar flux incl. in mag.
int
j_5sig_ba
J minor/major axis ratio fit to the 5-sigma isophote.
double
j_5sig_phi
J angle to 5-sigma major axis (E of N).
deg
int
h_5sig_ba
H minor/major axis ratio fit to the 5-sigma isophote.
double
h_5sig_phi
H angle to 5-sigma major axis (E of N).
arcsec
int
k_5sig_ba
K minor/major axis ratio fit to the 5-sigma isophote.
double
k_5sig_phi
K angle to 5-sigma major axis (E of N).
arcsec
int
j_d_area
J 5-sigma to 3-sigma differential area.
int
j_perc_darea
J 5-sigma to 3-sigma percent area change.
int
h_d_area
H 5-sigma to 3-sigma differential area.
int
h_perc_darea
H 5-sigma to 3-sigma percent area change.
int
k_d_area
K 5-sigma to 3-sigma differential area.
int
k_perc_darea
K 5-sigma to 3-sigma percent area change.
int
j_bisym_rat
J bi-symmetric flux ratio.
double
j_bisym_chi
J bi-symmetric cross-correlation chi.
double
h_bisym_rat
H bi-symmetric flux ratio.
double
h_bisym_chi
H bi-symmetric cross-correlation chi.
double
k_bisym_rat
K bi-symmetric flux ratio.
double
k_bisym_chi
K bi-symmetric cross-correlation chi.
double
j_sh0
J ridge shape (LCSB: BSNR limit).
double
j_sig_sh0
J ridge shape sigma (LCSB: B2SNR limit).
double
h_sh0
H ridge shape (LCSB: BSNR limit).
double
h_sig_sh0
H ridge shape sigma (LCSB: B2SNR limit).
double
k_sh0
K ridge shape (LCSB: BSNR limit).
double
k_sig_sh0
K ridge shape (LCSB: BSNR limit).
double
j_sc_mxdn
J mxdn (score) (LCSB: BSNR - block/smoothed SNR).
double
j_sc_sh
J shape (score).
double
j_sc_wsh
J wsh (score) (LCSB: PSNR - peak raw SNR).
double
j_sc_r23
J r23 (score) (LCSB: TSNR - integrated SNR for r=15).
double
j_sc_1mm
J 1st moment (score) (LCSB: super blk 2,4,8 SNR).
double
j_sc_2mm
J 2nd moment (score) (LCSB: SNRMAX - super SNR max).
double
j_sc_vint
J vint (score).
double
j_sc_r1
J r1 (score).
double
j_sc_msh
J r1 (score).
double
h_sc_mxdn
H mxdn (score) (LCSB: BSNR - block/smoothed SNR).
double
h_sc_sh
H shape (score).
double
h_sc_wsh
H wsh (score) (LCSB: PSNR - peak raw SNR).
double
h_sc_r23
H r23 (score) (LCSB: TSNR - integrated SNR for r=15).
double
h_sc_1mm
H 1st moment (score) (LCSB: super blk 2,4,8 SNR).
double
h_sc_2mm
H 2nd moment (score) (LCSB: SNRMAX - super SNR max).
double
h_sc_vint
H vint (score).
double
h_sc_r1
H r1 (score).
double
h_sc_msh
H median shape score.
double
k_sc_mxdn
K mxdn (score) (LCSB: BSNR - block/smoothed SNR).
double
k_sc_sh
K shape (score).
double
k_sc_wsh
K wsh (score) (LCSB: PSNR - peak raw SNR).
double
k_sc_r23
K r23 (score) (LCSB: TSNR - integrated SNR for r=15).
double
k_sc_1mm
K 1st moment (score) (LCSB: super blk 2,4,8 SNR).
double
k_sc_2mm
K 2nd moment (score) (LCSB: SNRMAX - super SNR max).
double
k_sc_vint
K vint (score).
double
k_sc_r1
K r1 (score).
double
k_sc_msh
K median shape score.
double
j_chif_ellf
J % chi-fraction for elliptical fit to 3-sig isophote.
double
k_chif_ellf
K % chi-fraction for elliptical fit to 3-sig isophote.
double
ellfit_flg
ellipse fitting contamination flag.
int
sup_chif_ellf
super-coadd % chi-fraction for ellip. fit to 3-sig isophote.
double
n_blank
number of blanked source records.
int
n_sub
number of subtracted source records.
int
bl_sub_flg
blanked/subtracted src description flag.
int
id_flg
type/galaxy ID flag (0=non-catalog, 1=catalog, 2=LCSB).
int
id_cat
matched galaxy's catalog name.
char
fg_flg
flux-growth convergence flag.
char
blk_fac
LCSB blocking factor (1, 2, 4, 8).
int
dup_src
Duplicate source flag.
int
use_src
Use source flag.
int
prox
Proximity.
arcsec
double
pxpa
The position angle on the sky of the vector from the source to the nearest neighbor in the PSC, in degrees East of North.
deg
int
pxcntr
ext_key value of nearest XSC source.
int
dist_edge_ns
The distance from the source to the nearest North or South scan edge.
arcsec
int
dist_edge_ew
The distance from the source to the nearest East or West scan edge.
arcsec
int
dist_edge_flg
flag indicating which edges ([n|s][e|w]) are nearest to src.
char
pts_key
key to point source data DB record.
int
mp_key
key to minor planet prediction DB record.
int
night_key
key to night data record in "scan DB".
int
scan_key
key to scan data record in "scan DB".
int
coadd_key
key to coadd data record in "scan DB".
int
hemis
hemisphere (N/S) of observation. "n" = North/Mt. Hopkins; "s" = South/CTIO.
char
date
The observation reference date for this source expressed in ISO standard format. (YYYY-MM-DD)
yyyy-mm-dd
char
scan
scan number (unique within date).
int
coadd
3-digit coadd number (unique within scan).
int
id
source ID number (unique within scan, coadd).
int
x_coadd
x (cross-scan) position (coadd coord.).
arcsec
double
y_coadd
y (in-scan) position (coadd coord.).
arcsec
double
j_subst2
J residual background #2 (score).
double
h_subst2
H residual background #2 (score).
double
k_subst2
K residual background #2 (score).
double
j_back
J coadd median background.
double
h_back
H coadd median background.
double
k_back
K coadd median background.
double
j_resid_ann
J residual annulus background median.
DN
double
h_resid_ann
H residual annulus background median.
DN
double
k_resid_ann
K residual annulus background median.
DN
double
j_bndg_per
J banding Fourier Transf. period on this side of coadd.
arcsec
int
j_bndg_amp
J banding maximum FT amplitude on this side of coadd.
DN
double
h_bndg_per
H banding Fourier Transf. period on this side of coadd.
arcsec
int
h_bndg_amp
H banding maximum FT amplitude on this side of coadd.
DN
double
k_bndg_per
K banding Fourier Transf. period on this side of coadd.
arcsec
int
k_bndg_amp
K banding maximum FT amplitude on this side of coadd.
DN
double
j_seetrack
J band seetracking score.
double
h_seetrack
H band seetracking score.
double
k_seetrack
K band seetracking score.
double
ext_key
entry counter (key) number (unique within table).
int
twomass_scn
Scan Working Data (70,712 survey mode scans).
scan_key
The unique identification number for this scan.
int
hemis
Observatory from which data were obtained: "n" = north = Mt. Hopkins, "s" = south = Cerro Tololo.
char
date
The observation reference date for this scan expressed in ISO standard format. (YYYY-MM-DD)
yyyy-mm-dd
char
scan
Scan number (unique within date).
int
tile
Tile identification number.
int
ra
Right ascension of scan center for equinox J2000.
deg
float
decl
Declination of scan center for equinox J2000.
deg
float
glon
Galactic longitude of scan center, as computed from ra and dec above.
deg
float
glat
Galactic latitude of scan center, as computed from ra and dec above.
deg
float
ra_1
J2000 right ascension of the eastern corner at start of scan.
deg
float
dec_1
J2000 declination of the eastern corner at start of scan.
deg
float
ra_2
J2000 right ascension of the western corner at start of scan.
deg
float
dec_2
J2000 declination of the western corner at start of scan.
deg
float
ra_3
J2000 right ascension of the eastern corner at end of scan.
deg
float
dec_3
J2000 declination of the eastern corner at end of scan.
deg
float
ra_4
J2000 right ascension of the western corner at end of scan.
deg
float
dec_4
J2000 declination of the western corner at end of scan.
deg
float
sd
Scanning direction: "n" = north-going, "s" = south-going.
char
qual
Quality score for scan.
int
hgl
Special flag indicating whether or not this scan has a single-frame H-band electronic glitch.
int
cld
Special flag indicating whether or not a cloud was found in the scan after comparison of its photometry to that of overlapping scans in the database.
int
xph
Special flag indicating whether or not another photometric problem, not obviously cloud related, was found in the scan after comparing its photometry to that of overlapping scans.
int
anom
Special flag indicating whether or not an unusual problem was found in the Atlas Images for this scan.
int
ut
Universal Time (UT) at beginning of scan.
hr
float
jdate
Julian Date at beginning of scan.
Julian days
float
airm
Airmass at beginning of scan.
float
zd
Scan's distance from the zenith at beginning of scan.
deg
float
ha
Hour angle at beginning of scan.
hr
float
rh
Relative humidity of telescope enclosure at beginning of scan.
percents
int
air_temp
Air temperature at beginning of scan.
degC
float
tel_temp
Telescope girdle temperature at beginning of scan.
degC
float
focus
Focus setting of telescope at beginning of scan.
int
hry
Flag indicating the H-band array configuration for the camera.
int
c_strat
Flag indicating the calibration strategy for this night's data.
int
j_zp_ap
Photometric zero-point for J-band aperture photometry.
mag
float
h_zp_ap
Photometric zero-point for H-band aperture photometry.
mag
float
k_zp_ap
Photometric zero-point for Ks-band aperture photometry.
mag
float
h_zperr_ap
RMS-error of zero-point for H-band aperture photometry
mag
float
k_zperr_ap
RMS-error of zero-point for Ks-band aperture photometry
mag
float
j_n_snr10
Number of point sources at J-band with SNR>10 (instrumental mag lover or =15.8)
int
h_n_snr10
Number of point sources at H-band with SNR>10 (instrumental mag lover or =15.1)
int
k_n_snr10
Number of point sources at Ks-band with SNR>10 (instrumental mag lover or =14.3)
int
n_ext
Number of regular extended sources detected in scan.
int
j_shape_avg
J-band average seeing shape for scan.
float
h_shape_avg
H-band average seeing shape for scan.
float
k_shape_avg
Ks-band average seeing shape for scan.
float
j_shape_rms
RMS-error of J-band average seeing shape.
float
h_shape_rms
RMS-error of H-band average seeing shape.
float
k_shape_rms
RMS-error of Ks-band average seeing shape.
float
j_2mrat
J-band average 2nd image moment ratio.
float
h_2mrat
H-band average 2nd image moment ratio.
float
k_2mrat
Ks-band average 2nd image moment ratio.
float
j_psp
J-band photometric sensitivity paramater (PSP).
float
h_psp
H-band photometric sensitivity paramater (PSP).
float
k_psp
Ks-band photometric sensitivity paramater (PSP).
float
j_pts_noise
Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured J-band photometric errors and is expressed in units of mJy.
float
h_pts_noise
Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured H-band photometric errors and is expressed in units of mJy.
float
k_pts_noise
Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured Ks-band photometric errors and is expressed in units of mJy.
float
j_msnr10
The estimated J-band magnitude at which SNR=10 is achieved for this scan.
mag
float
h_msnr10
The estimated H-band magnitude at which SNR=10 is achieved for this scan.
mag
float
k_msnr10
The estimated Ks-band magnitude at which SNR=10 is achieved for this scan.
mag
float
rel0
Flag indicating whether the scan is contained in the TWOMASS Sampler Release.
int
rel1
Flag indicating whether the scan is contained in the TWOMASS First Incremental Data Release (IDR1).
int
rel2
Flag indicating whether the scan is contained in the TWOMASS Second Incremental Data Release (IDR2).
int
gsc23
The GSC2.3.2 Catalogue (945598527 objects for export version).
The GSC II is an all-sky catalog based on 1" resolution scans of the
photographic Sky Survey plates, at two epochs and three bandpasses,
from the Palomar and UK Schmidt telescopes (DSS).
Positions, magnitudes, and classifications are produced for all
objects on each plate.
The GSC2.3 has no magnitude limit. The parameters of the bright
objects, overexposed on the Schmidt plates, are taken from the Tycho-2
(I/259) catalog. Reference:
The Second Generation Guide Star Catalog : Description and Properties
Lasker et al 2008 AJ 136,735
gsc2id
[NS0-9A-Z] Identification of the object
char
meta.id;meta.mainchar
gsc1id
Identification of object in GSC Version 1
char
meta.id;meta.mainchar
htm6
[NS0-3] HTM-6 designation as in GSC2.2
char
obs.fieldchar
ra
(ra) Right ascension (J2000)
deg
pos.eq.ra;meta.maindouble
dec
(dec) Declination (J2000)
deg
pos.eq.dec;meta.maindouble
ra_eps
Mean error on RAdeg, multiplied by cos(delta)
arcsec
stat.error;pos.eq.rafloat
dec_eps
Mean error on DECdeg
arcsec
stat.error;pos.eq.decfloat
mean_epoch
Epoch of the mean
yr
time.epochfloat
ra_pm
Proper motion in RA, multiplied by cos(delta)
mas/yr
pos.pm;pos.eq.rafloat
dec_pm
Proper motion in DEC
mas/yr
pos.pm;pos.eq.decfloat
ra_pm_err
Mean error on proper motion in RA
mas
stat.errorfloat
dec_pm_err
Mean error on proper motion in DEC
mas
stat.errorfloat
delta_epoch
Epoch of the mean
yr
time.epochfloat
f_mag
(f_mag) Magnitude in F photographic band (red)
mag
phot.mag;em.opt.Rfloat
f_mag_err
(f_mag_err) Mean error on fmag
mag
stat.error;phot.mag;em.opt.Rfloat
f_mag_code
(f_mag_code) Coded emulsion / bandpass / filter
meta.noteint
j_mag
(j_mag) Magnitude in Bj photographic band (blue)
mag
phot.mag;em.opt.Bfloat
j_mag_err
(j_mag_err) Mean error on jmag
mag
stat.error;phot.mag;em.opt.Bfloat
j_mag_code
(j_mag_code) Coded emulsion / bandpass / filter
meta.noteint
v_mag
(v_mag) Magnitude in V photographic band (green)
mag
phot.mag;em.opt.Vfloat
v_mag_err
(v_mag_err) Mean error on vmag
mag
stat.error;phot.mag;em.opt.Vfloat
v_mag_code
(v_mag_code) Coded emulsion / bandpass / filter
meta.noteint
n_mag
(n_mag) Magnitude in N photographic band (0.8um)
mag
phot.mag;em.opt.IR.8-15umfloat
n_mag_err
(n_mag_err) Mean error on nmag
mag
stat.error;phot.mag;em.opt.IR.8-15umfloat
n_mag_code
(n_mag_code) Coded emulsion / bandpass / filter
meta.noteint
u_mag
(u_mag) Magnitude in U band (Johnson)
mag
phot.mag;em.opt.Ufloat
u_mag_err
(u_mag_err) Mean error on umag
mag
stat.error;phot.mag;em.opt.Ufloat
u_mag_code
(u_mag_code) Coded emulsion / bandpass / filter
meta.noteint
b_mag
(b_mag) Magnitude in B band (Johnson blue)
mag
phot.mag;em.opt.Bfloat
b_mag_err
(b_mag_err) Mean error on bmag
mag
stat.error;phot.mag;em.opt.Bfloat
b_mag_code
(b_mag_code) Coded emulsion / bandpass / filter
meta.noteint
class
[0,5] Object class
meta.codeint
source_status
Source status flag
meta.code.errorint
multobj
[M] 'M' for multiple object
meta.codechar
size_a
Semi-major axis of fitting ellipse
pix
phys.angSize;srcfloat
eccen
Eccentricity of fitting ellipse
src.orbital.eccentricityfloat
a_pa
Position angle (N->E) of fitting ellipse
deg
pos.posAngfloat
gaia
GaiaSource DR1 Catalog.
This table has an entry for every Gaia observed source as listed in the Main Dat
abase accumulating catalogue version from which the catalogue release has been g
enerated. It contains the basic source parameters, that is only final data (no e
poch data) and no spectra (neither final nor epoch).
solution_id
All Gaia data processed by the Data Processing and Analysis
Consortium comes tagged with a solution identifier. This is a numeric field
attached to each table row that can be used to unequivocally identify
the version of all the subsystems that where used in the generation of
the data as well as the input data used. It is mainly for internal DPAC
use but is included in the published data releases to enable end users
to examine the provenance of processed data products. To decode a given
solution ID visit.
meta.id;meta.versionlong
source_id
A unique single numerical identifier of the source.
For the contents of Gaia DR1, which does not include Solar System
objects, the source ID consists consists of a 64-bit integer, least
significant bit = 1 and most significant bit = 64, comprising:
- a HEALPix index number (sky pixel) in bits 36 - 63; by definition
the smallest HEALPix index number is zero.
- a 2-bit Data Processing Centre code in bits 34 - 35; for example
MOD(sourceId / 4294967296, 8) can be used to distinguish between
sources initialised via the Initial Gaia Source List by the Torino
DPC (code = 0) and sources otherwise detected and assigned by Gaia
observations (code = >0)
- a 25-bit plus 7 bit sequence number within the HEALPix pixel in bits
1 - 32 split into:
- a 25 bit running number in bits 8-32;the running numbers are
defined to be positive, i.e. ver zero (except in the case of
forced empty windows)
- a 7-bit component number in bits 1-7
- one spare bit in bit 33
This means that the HEALpix index level 12 of a given source is
contained in the most significant bits. HEALpix index of 12 and lower
levels can thus be retrieved as follows:
- HEALpix level 12 = source_id / 34359738368
- HEALpix level 11 = source_id / 137438953472
- HEALpix level 10 = source_id / 549755813888
- HEALpix level n = source_id / 2 ^ 35 * 4 ^ (12 - level).
meta.id;meta.mainlong
random_index
Random index which can be used to select smaller subsets of
the data that are still representative. The column contains a random permutation
of the numbers from 0 to N-1, where N is the number of rows.
The random index can be useful for validation (testing on 10 different
random subsets), visualization (displaying 1% of the data), and
statistical exploration of the data, without the need to download all
the data.
meta.codelong
ref_epoch
Reference epoch to which the astrometic source parameters are
refer red, expressed as a Julian Year in TCB.
Time[Julian Years]
meta.ref;time.epochdouble
ra
Barycentric right ascension \alpha of the source in ICRS at the
reference epoch refEpoch
deg
pos.eq.ra;meta.maindouble
ra_error
Standard error \sigma_{\alpha *} \equiv \sigma_\alpha\cos\delta of
the right ascension of the source in ICRS at the reference epoch refEpoch
Angle[mas]
stat.error;pos.eq.radouble
dec
Barycentric declination \delta of the source in ICRS at the reference
epoch refEpoch
deg
pos.eq.dec;meta.maindouble
dec_error
Standard error \sigma_\delta of the declination of the source in ICRS at
the reference epoch refEpoch
Angle[mas]
stat.error;pos.eq.decdouble
parallax
Absolute barycentric stellar parallax \varpi of the soure at the
reference epoch refEpoch
Angle[mas]
pos.parallaxdouble
parallax_error
Standard error \sigma_\varpi of the stellar parallax at the referen
ceepoch refEpoch
Angle[mas]
stat.error;pos.parallaxdouble
pmra
Proper motion in right ascension \mu_{\alpha *} of the source in IC
RS at the reference epoch refEpoch. This is the projection of the proper
motion vector in the direction of increasing right ascension.
Angular Velocity[mas/year]
pos.pm;pos.eq.radouble
pmra_error
Standard error \sigma_{\mu\alpha *} of the proper motion vector in
right ascension at the reference epoch refEpoch
Angular Velocity[mas/year]
stat.error;pos.pm;pos.eq.radouble
pmdec
Proper motion in declination \mu_\delta of the source at the reference
epoch refEpoch. This is the projection of the proper motion vector in
the direction of increasing declination.
Angular Velocity[mas/year]
pos.pm;pos.eq.decdouble
pmdec_error
Standard error \sigma_{\mu\delta} of the proper motion in declination at
the reference epoch refEpoch
Angular Velocity[mas/year]
stat.error;pos.pm;pos.eq.decdouble
ra_dec_corr
Correlation between right ascension and declination, in dimensionless
units [-1:+1]
Dimensionless
stat.correlationfloat
ra_parallax_corr
Correlation between right ascension and parallax, in dimensionless
units [-1:+1]
Dimensionless
stat.correlationfloat
ra_pmra_corr
Correlation between right ascension and proper motion in right
ascension, in dimensionless units [-1:+1]
Dimensionless
stat.correlationfloat
ra_pmdec_corr
Correlation between right ascension and proper motion in declination, in
dimensionless units [-1:+1]
Dimensionless
stat.correlationfloat
dec_parallax_corr
Correlation between declination and parallax, in dimensionless units
[-1:+1]
Dimensionless
stat.correlationfloat
dec_pmra_corr
Correlation between declination and proper motion in right ascension, in
dimensionless units [-1:+1]
Dimensionless
stat.correlationfloat
dec_pmdec_corr
Correlation between declination and proper motion in declination, in
dimensionless units [-1:+1]
Dimensionless
stat.correlationfloat
parallax_pmra_corr
Correlation between parallax and proper motion in right ascension,
dimensionless units [-1:+1]
Dimensionless
stat.correlationfloat
parallax_pmdec_corr
Correlation between parallax and proper motion in declination, in
dimensionless units [-1:+1]
Dimensionless
stat.correlationfloat
pmra_pmdec_corr
Correlation between proper motion in right ascension and proper motion
in declination, in dimensionless units [-1:+1]
Dimensionless
stat.correlationfloat
astrometric_n_obs_al
Total number of AL observations (= CCD transits) used in the astrometric
solution of the source, independent of their weight. Note that some
observations may be strongly downweighted (see astrometricNBadObsAl).
Dimensionless
meta.numberint
astrometric_n_obs_ac
Total number of AC observations (= CCD transits) used in the astrometric
solution of the source, independent of their weight. Note that some
observations may be strongly downweighted (see astrometricNBadObsAc).
Nearly all sources having G less than 13 will have AC observations from 2d
windows, while fainter than that limit only \sim1% of stars
are assigned 2d windows resulting in AC observations.
Dimensionless
meta.numberint
astrometric_n_good_obs_ac
Number of AC observations (= CCD transits) that were not strongly
downweighted in the astrometric solution of the source. Strongly
downweighted observations (with downweighting factor w less than 0.2) are instead
counted in astrometricNBadObsAc. The sum of astrometricNGoodObsAc and
astrometricNBadObsAc equals astrometricNObsAc, the total number of AC
observations used in the astrometric solution of the source.
Dimensionless
meta.numberint
astrometric_n_bad_obs_al
Number of AL observations (= CCD transits) that were strongly
downweighted in the astrometric solution of the source, and therefore
contributed little to the determination of the astrometric parameters.
An observation is considered to be strongly downweighted if its
downweighting factor w less than 0.2, which means that the absolute value of the
astrometric residual exceeds 4.83 times the total uncertainty of the
observation, calculated as the quadratic sum of the centroiding
uncertainty, excess source noise, and excess attitude noise.
Dimensionless
meta.numberint
astrometric_n_bad_obs_ac
Number of AC observations (= CCD transits) that were strongly
downweighted in the astrometric solution of the source, and therefore
contributed little to the determination of the astrometric parameters.
An observation is considered to be strongly downweighted if its
downweighting factor w less than 0.2, which means that the absolute value of the
astrometric residual exceeds 4.83 times the total uncertainty of the
observation, calculated as the quadratic sum of the centroiding
uncertainty, excess source noise, and excess attitude noise.
Dimensionless
meta.numberint
astrometric_delta_q
In the TGAS solution \tt astrometricDeltaQ (\Delta Q) indicates the
discrepancy between the Hipparcos proper motion and the TGAS proper
motion. A large value of \tt deltaQ could indicate non-linear motion
(e.g. n a binary).
The precise definition is
\Delta Q =
\begin{bmatrix}
\Delta\mu_{\alpha *} \and \Delta\mu_{\delta}
\end{bmatrix}
\left(\vec{C}_\text{pm,\,T}+\vec{C}_\text{pm,\,H}\right)^{-1}
\begin{bmatrix}
\Delta\mu_{\alpha *} \\ \Delta\mu_{\delta}
\end{bmatrix}
where \Delta\mu_{\alpha *} = \mu_{\alpha *,\rm T}-\mu_{\alpha *,\rm H},
\Delta\mu_{\delta} = \mu_{\delta,\rm T}-\mu_{\delta,\rm H}, with T and H
indicating values from the Gaia DR1 (TGAS) solution and Hipparcos
catalogue. \vec{C}_\text{pm,\,T} and \vec{C}_\text{pm,\,H} are the
corresponding 2\times 2 covariance matrices.
In order to compute \Delta Q the two sets of proper motions must use the
same reference frame and the same reference epoch. Thus, the proper
motion components as given in the Hipparcos catalogue were rotated to
the Gaia DR1 reference frame, and then propagated to the Gaia reference
epoch.
Angle[mas]
stat.valuefloat
astrometric_excess_noise
This is the excess noise \epsilon_i of the source. It measures the
disagreement, expressed as an angle, between the observations of a
source and the best-fitting standard astrometric model (using five
astrometric parameters). The assumed observational noise in each
observation is quadratically increased by \epsilon_i in order to
statistically match the residuals in the astrometric solution. A value
of 0 signifies that the source is astrometrically well-behaved, i.e.
that the residuals of the fit statistically agree with the assumed
observational noise. A positive value signifies that the residuals are
statistically larger than expected.
The significance of \epsilon_i is given by \tt
astrometricExcessNoiseSig (D). If D\le 2 then \epsilon_i is probably not
significant, and the source may be astrometrically well-behaved even if
\epsilon_i is large.
The excess noise \epsilon_i may absorb all kinds of modelling errors
that are not accounted for by the observational noise (image centroiding
error) or the excess attitude noise. Such modelling errors include LSF
and PSF calibration errors, geometric instrument calibration errors, and
part of the high-frequency attitude noise. These modelling errors are
particularly important in the early data releases, but should decrease
as the astrometric modelling of the instrument and attitude improves
over the years.
Additionally, sources that deviate from the standard five-parameter
astrometric model (e.g. n resolved binaries, exoplanet systems, etc.)
may have positive \epsilon_i. Given the many other possible
contributions to the excess noise, the user must study the empirical
distributions of \epsilon_i and D to make sensible cutoffs before
filtering out sources for their particular application.
In Gaia DR1, the excess source noise has the same interpretation as
described above for both the primary (TGAS) and secondary data sets. It
measures the disagreement between the five-parameter model and the
observations, augmented by the different priors used. Thus, in TGAS the
excess noise may be increased if the proper motion seen during the 14
months of Gaia observations are not in agreement with the proper motion
inferred from the Tycho-2/Gaia comparison. In the secondary solution the
excess noise may be increased if the Gaia observations indicate a proper
motion or parallax several times larger than the prior uncertainty.
The excess source noise is further explained in Sects .6 and 5.1.2 of
Lindegren et al. (2012).
Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J.
Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission.
Overview of Models, Algorithms, and Software Implementation.
Astronomy and Astrophysics 538 (February).
Angle[mas]
stat.valuedouble
astrometric_excess_noise_sig
A dimensionless measure (D) of the significance of the calculated \
tt
astrometricExcessNoise (\epsilon_i). A value D less than 2 indicates that the
given \epsilon_i is probably significant.
For good fits in the limit of a large number of observations, D should
be zero in half of the cases and approximately follow the positive half
of a normal distribution with zero mean and unit standard deviation for
the other half. Consequently, D is expected to be greater than 2 for
only a few percent of the sources with well-behaved astrometric
solutions.
In the early data releases \epsilon_i will however include instrument
and attitude modelling errors that are statistically significant and
could result in large values of \epsilon_i and D. The user must study
the empirical distributions of these statistics and make sensible
cutoffs before filtering out sources for their particular application.
The excess noise significance is further explained in Sect. 1.2 of
Lindegren et al. (2012).
Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J.
Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission.
Overview of Models, Algorithms, and Software Implementation.
Astronomy and Astrophysics 538 (February).
Angle[mas]
stat.valuedouble
astrometric_primary_flag
Flag indicating if this source was used as a primary source (\tt true)
or secondary source (\tt false). Only primary sources contribute to the
estimation of attitude, calibration, and global parameters. The
estimation of source parameters is otherwise done in exactly the same
way for primary and secondary sources.
meta.codeboolean
astrometric_relegation_factor
Relegation factor of the source calculated as per Eq. 118) in Lindegren
et al. (2012) used for the primary selection process.
Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J.
Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission.
Overview of Models, Algorithms, and Software Implementation.
Astronomy and Astrophysics 538 (February).
arith.factorfloat
astrometric_weight_al
Mean astrometric weight of the source in the AL direction
The mean astrometric weight of the source is calculated as per Eq. \sigma =(119)
in Lindegren et al. (2012).
Lindegren, L., U. Lammers, D. Hobbs, MullaneW., U. Bastian, and J.
Hernandez. 2012.The Astrometric Core Solution for the Gaia Mission.
Overview of Models, Algorithms, and Software Implementation.
Astronomy and Astrophysics 538 (February).
Angle[mas^-2]
stat.weight;stat.meanfloat
astrometric_priors_used
Type of prior used in the astrometric solution:
- 0: No prior used
- 1: Galaxy Bayesian Prior for parallax and proper motion
- 2: Galaxy Bayesian Prior for parallax and proper motion relaxed by
factor 10
- 3: Hipparcos prior for position
- 4: Hipparcos prior for position and proper motion
- 5: Tycho2 prior for position
- 6: Quasar prior for proper motion
The Galaxy Bayesian Prior is defined in , where it is denoted
\sigma_{\varpi,F90} (for the parallax) and
\sigma_{\mu,F90}={\cal R}\sigma_{\varpi,F90}, with {\cal
R}=10r^{-1} (for proper motion). The Galaxy Bayesian Prior relaxed by
a factor 10 is 10\sigma_{\varpi,F90} and 10\sigma_{\mu,F90},
respectively.
For Gaia DR1 the only types of priors used are 2 (for the secondary data
set), 3 (for the Hipparcos subset of the primary data set), or 5 (for
the non-Hipparcos subset of the primary data set). Type 6 was used for
internal calibration purposes and alignment of the reference frame, but
the corresponding astrometric results are in general not published.
meta.numberint
matched_observations
This field indicates the number of observations (detection transits)
that have been matched to a given source during the last internal
crossmatch revision.
meta.numbershort
duplicated_source
During data processing, this source happened to been duplicated and one
source only has been kept. This may indicate observational,
cross-matching or processing problems, or stellar multiplicity, and
probable astrometric or photometric problems in all cases. In DR1, for
close doubles with separations below some 2 arcsec, truncated windows
have not been processed, neither in astrometry and photometry. The
transmitted window is centred on the brighter part of the acquired
window, so the brighter component has a better chance to be selected,
even when processing the fainter transit. If more than two images are
contained in a window, the result of the image parameter determination
is un-predictable in the sense that it might refer to either (or
neither) image, and no consistency is assured.
meta.numberboolean
scan_direction_strength_k1
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
meta.numberfloat
scan_direction_strength_k2
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
meta.numberfloat
scan_direction_strength_k3
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
meta.numberfloat
scan_direction_strength_k4
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
meta.numberfloat
scan_direction_mean_k1
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
Angle[deg]
meta.numberfloat
scan_direction_mean_k2
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
Angle[deg]
meta.numberfloat
scan_direction_mean_k3
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
Angle[deg]
meta.numberfloat
scan_direction_mean_k4
The scanDirectionStrength and scanDirectionMean quantify the
distribution of AL scan directions across the source.
scanDirectionStrength[k-1] (k=1,2,3,4) is the absolute value of the
trigonometric moments m_k=\langle\exp(ik\theta)\rangle, where \theta is
the position angle of the scan and the mean value is taken over the
nObs[0] AL observations contributing to the astrometric parameters of
the source. \theta is defined in the usual astronomical sense: \theta=0
when the FoV is moving towards local North, and \theta=90^\circ towards
local East.
The scanDirectionStrength is a number between 0 and 1, where 0 means
that the scan directions are well spread out in different directions,
while 1 means that they are concentrated in a single direction (given by
scanAngleMean).
The different orders k are statistics of the scan directions modulo
360^\circ/k. For example, at first order (k=1), \theta=10^\circ and
\theta=190^\circ count as different directions, but at second order
(k=2) they are the same. Thus, scanDirectionStrength[0] is the degree of
concentration when the sense of direction is taken into account, while
scanDirectionStrength[1] is the degree of concentration without regard
to the sense of direction. A large value of scanDirectionStrength[3]
indicates that the scans are concentrated in two nearly orthogonal
directions.
Angle[deg]
meta.numberfloat
phot_g_n_obs
Number of observations (CCD transits) that contributed to the G mean
flux and mean flux error.
meta.numberint
phot_g_mean_flux
Mean flux in the G-band.
Flux[e-/s]
phot.flux;stat.mean;em.optdouble
phot_g_mean_flux_error
Error on the mean flux in the G-band.
Flux[e-/s]
stat.error;phot.flux;stat.mean;em.optdouble
phot_g_mean_mag
Mean magnitude in the G band. This is computed from the G-band mean flux
applying the magnitude zero-point in the Vega scale.
Magnitude[mag]
phot.mag;stat.mean;em.optdouble
phot_variable_flag
Flag indicating if variability was identified in the photometric G
band:
- source not processed and/or exported to catalogue
- Source not identified as variable
- source identified and processed as variable, see tables
PhotVariableSummary, PhotVariableTimeSeriesGfov,
PhotVariableTimeSeriesGfovStatisticalParameters, and Cepheid or
Rrlyrae for more details.
Note that for this data release only a small subset of (variable)
sources was processed and/or exported, so for many (known) variable
sources this flag is set to NOT AVAILABLE. No CONSTANT sources were
exported either.
char
meta.code;src.varchar
l
Galactic Longitude of the object at reference epoch refEpoch, see ESA,
1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1,
Section 1.5.3, for the conversion details.
Angle[deg]
pos.galactic.londouble
b
Galactic Latitude of the object at reference epoch refEpoch
1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1,
Section 1.5.3, for the conversion details.
Angle[deg]
pos.galactic.latdouble
ecl_lon
Ecliptic Longitude of the object at reference epoch refEpoch, see ESA
1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1,
Section 1.5.3, for the conversion details.
Angle[deg]
pos.ecliptic.londouble
ecl_lat
Ecliptic Latitude of the object at reference epoch refEpoch, see ESA
1997, The Hipparcos and Tycho Catalogues ESA SP-1200, Volume 1,
Section 1.5.3, for the conversion details.
Angle[deg]
pos.ecliptic.londouble