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VizieR

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II/246/out 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
The Point Source catalogue of 470,992,970 sources. Please acknowledge the usage of the 2MASS All-Sky Survey; see also the 2MASS Pages.    Note that the magnitudes in red correspond to low quality results (upper limits or very poor photometry) (470992970 rows)
  2MASS===20212140+4325407
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ColumnValue  Explain   (UCD)
_RAJ200020 21 21.40176 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000+43 25 40.7352 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195020 19 39.17951 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950+43 16 04.2576 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon080.66875186 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat+03.80316538 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)

RAJ2000305.339174 deg (i) (ra) Right ascension (J2000) (pos.eq.ra;meta.main)
DEJ2000+43.427982 deg (i) (dec) Declination (J2000) (dec) (pos.eq.dec;meta.main)
errMaj 0.06 arcsec (err_maj) Semi-major axis of position error ellipse (stat.error)
errMin 0.06 arcsec (err_min) Semi-minor axis of position error ellipse (stat.error)
errPA 90 deg [0,180] (err_ang) Position angle of error ellipse major axis (E of N) (stat.error)
2MASS20212140+4325407  (i) (designation) Source designation (Note 1)   (meta.id;meta.main)
Jmag13.687 mag (i) (j_m) J selected default magnitude (Note 2)   (phot.mag;em.IR.J)
Jcmsig 0.023 mag (j_cmsig) J default magnitude uncertainty (Note 3)   (stat.error;phot.mag)
e_Jmag 0.026 mag (j_msigcom) J total magnitude uncertainty (Note 4)   (stat.error;phot.mag;em.IR.J)
Jsnr 85.6  (j_snr) J Signal-to-noise ratio (stat.snr)
Hmag12.313 mag (i) (h_m) H selected default magnitude (Note 2)   (phot.mag;em.IR.H)
Hcmsig 0.021 mag (h_cmsig) H default magnitude uncertainty (Note 3)   (stat.error;phot.mag)
e_Hmag 0.022 mag (h_msigcom) H total magnitude uncertainty (Note 4)   (stat.error;phot.mag;em.IR.H)
Hsnr 139.2  (h_snr) H Signal-to-noise ratio (stat.snr)
Kmag11.807 mag (i) (k_m) K selected default magnitude (Note 2)   (phot.mag;em.IR.K)
Kcmsig 0.016 mag (k_cmsig) K default magnitude uncertainty (Note 3)   (stat.error;phot.mag)
e_Kmag 0.018 mag (k_msigcom) K total magnitude uncertainty (Note 4)   (stat.error;phot.mag;em.IR.K)
Ksnr 159.8  (k_snr) K Signal-to-noise ratio (stat.snr)
QflgAAA  (ph_qual) JHK Photometric quality flag (Note 5)   (meta.code.qual;phot)
Rflg222  (rd_flg) Source of JHK default mag (Note 6)   (meta.ref)
Bflg111  (bl_flg) JHK components fit to source (Note 7)   (meta.code)
Cflg000  (cc_flg) Artifact contamination, confusion (Note 8)   (meta.code)
Ndet666666   [0-9] (ndet) Number of aperture measurements (jjhhkk) (Note 9)   (meta.number)
prox 8.0 arcsec Distance between source and nearest neighbour (pos.angDistance)
pxPA294 deg (pxpa) Position angle of vector from source to nearest neighbour (E of N) (pos.posAng)
pxCntr 391363722  (pxcntr) Sequence number of nearest neighbour (meta.number)
Xflg0   [0,2] (gal_contam) Extended source contamination (Note 10)   (meta.code)
Aflg0   [0,1] (mp_flg) Association with asteroid or comet (Note 11)   (meta.code)
Cntr 391363730  (pts_key) Unique source identifier in catalogue (meta.id;meta.table)
Hemisn   [ns] (hemis) Hemisphere of observation (obs.param;obs)
Date1998-11-01  (date) Observation date (time.epoch;obs)
Scan 11  (scan) Scan number (within date) (obs.field)
GLON 80.669 deg (glon) Galactic longitude (Note 12)   (pos.galactic.lon)
GLAT 3.803 deg (glat) Galactic latitude (Note 12)   (pos.galactic.lat)
Xscan 104.1 arcsec (x_scan) Distance of source from focal plane centerline (pos.cartesian;instr.det)
JD2451118.5901 d (jdate) Julian date of source measurement (Note 13)   (time.epoch)
Jpsfchi 0.87  (j_psfchi) J band reduced chi2 value of fit (stat.fit.chi2;stat.value)
Hpsfchi 0.77  (h_psfchi) H band reduced chi2 value of fit (stat.fit.chi2;stat.value)
Kpsfchi 1.12  (k_psfchi) K band reduced chi2 value of fit (stat.fit.chi2;stat.value)
Jstdap13.705 mag (jmstdap) J standard aperture magnitude (Note 18)   (phot.mag;em.IR.J)
e_Jstdap 0.027 mag (jmsigstdap) error on Jstdap (stat.error)
Hstdap12.344 mag (hmstdap) H standard aperture magnitude (Note 18)   (phot.mag;em.IR.H)
e_Hstdap 0.013 mag (hmsigstdap) error on Hstdap (stat.error)
Kstdap11.837 mag (kmstdap) K standard aperture magnitude (Note 18)   (phot.mag;em.IR.K)
e_Kstdap 0.020 mag (kmsigstdap) error on Kstdap (stat.error)
edgeNS 5668 arcsec (distedgens) Distance from the source to the nearest North or South scan edge (pos;arith.diff)
edgeEW149 arcsec (distedgeew) Distance from the source to the nearest East or West scan edge (pos;arith.diff)
edgesw   [nsew] (distedgeflg) flag indicating to which edges the edgeNS and edgeEW values refer (pos.cartesian;instr.det)
dup0  (dup_src) Flag indicating duplicate source (Note 14)   (meta.code)
use1  (use_src) Use source flag (Note 15)   (meta.code)
opt0   [0UT] (a) Associated optical source (Note 16)   (meta.id;meta.dataset)
Dopt  arcsec (dist_opt) Distance to associated optical source (pos.angDistance)
PAopt  deg [0,360] (phi_opt) position angle from optical source to the 2MASS source position (pos.posAng)
Bmag  mag (bmopt) Blue magnitude of associated optical source (phot.mag;em.opt.B)
Rmag  mag (vrmopt) Visual or red mag of associated optical source (phot.mag;em.opt.R)
Nopt0  (nopt_mchs) Number of optical sources within 5arcsec (Note 17)   (meta.number)
extKey   (ext_key) Record Identifier in XSC (meta.id.cross)
scanKey23757  (scan_key) Record Identifier in the Scan Information Table (meta.id)
coaddKey 546405  (coadd_key) Record Identifier in the Atlas Image Data Table (meta.id;meta.dataset)
coadd197  (coadd) Sequence number of the Atlas Image (meta.number)

OptOpt  Show the nearby Optical Sources from USNO and GSC Catalogues (meta.ref.url)
  
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