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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===02181477+4903212
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ColumnValue  Explain   (UCD)
_RAJ200002 18 14.77656 "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+49 03 21.2148 "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)
_RAB195002 14 57.97190 "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+48 49 32.1902 "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)
_Glon137.24336846 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-11.38860516 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)

RAJ2000034.561569 deg (i) (ra) Right ascension (J2000) (pos.eq.ra;meta.main)
DEJ2000+49.055893 deg (i) (dec) Declination (J2000) (dec) (pos.eq.dec;meta.main)
errMaj 0.30 arcsec (err_maj) Semi-major axis of position error ellipse (stat.error)
errMin 0.26 arcsec (err_min) Semi-minor axis of position error ellipse (stat.error)
errPA105 deg [0,180] (err_ang) Position angle of error ellipse major axis (E of N) (stat.error)
_MASS02181477+4903212  (i) (designation) Source designation (Note 1)   (meta.id;meta.main)
Jmag16.314 mag (i) (j_m) J selected default magnitude (Note 2)   (phot.mag;em.IR.J)
Jcmsig 0.095 mag (j_cmsig) J default magnitude uncertainty (Note 3)   (stat.error;phot.mag)
e_Jmag 0.096 mag (j_msigcom) J total magnitude uncertainty (Note 4)   (stat.error;phot.mag;em.IR.J)
Jsnr 11.5  (j_snr) J Signal-to-noise ratio (stat.snr)
Hmag16.010 mag (i) (h_m) H selected default magnitude (Note 2)   (phot.mag;em.IR.H)
Hcmsig 0.159 mag (h_cmsig) H default magnitude uncertainty (Note 3)   (stat.error;phot.mag)
e_Hmag 0.159 mag (h_msigcom) H total magnitude uncertainty (Note 4)   (stat.error;phot.mag;em.IR.H)
Hsnr 7.0  (h_snr) H Signal-to-noise ratio (stat.snr)
Kmag15.979 mag (i) (k_m) K selected default magnitude (Note 2)   (phot.mag;em.IR.K)
Kcmsig 0.223 mag (k_cmsig) K default magnitude uncertainty (Note 3)   (stat.error;phot.mag)
e_Kmag 0.223 mag (k_msigcom) K total magnitude uncertainty (Note 4)   (stat.error;phot.mag;em.IR.K)
Ksnr 4.5  (k_snr) K Signal-to-noise ratio (stat.snr)
QflgACD  (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)
Ndet160606   [0-9] (ndet) Number of aperture measurements (jjhhkk) (Note 9)   (meta.number)
prox 17.7 arcsec Distance between source and nearest neighbour (pos.angDistance)
pxPA119 deg (pxpa) Position angle of vector from source to nearest neighbour (E of N) (pos.posAng)
pxCntr 476834041  (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 476834032  (pts_key) Unique source identifier in catalogue (meta.id;meta.table)
Hemisn   [ns] (hemis) Hemisphere of observation (obs.param;obs)
Date1998-12-05  (date) Observation date (time.epoch;obs)
Scan 41  (scan) Scan number (within date) (obs.field)
GLON137.243 deg (glon) Galactic longitude (Note 12)   (pos.galactic.lon)
GLAT-11.388 deg (glat) Galactic latitude (Note 12)   (pos.galactic.lat)
Xscan-107.8 arcsec (x_scan) Distance of source from focal plane centerline (pos.cartesian;instr.det)
JD2451152.7143 d (jdate) Julian date of source measurement (Note 13)   (time.epoch)
Jpsfchi 1.01  (j_psfchi) J band reduced chi2 value of fit (stat.fit.chi2;stat.value)
Hpsfchi 1.27  (h_psfchi) H band reduced chi2 value of fit (stat.fit.chi2;stat.value)
Kpsfchi 1.23  (k_psfchi) K band reduced chi2 value of fit (stat.fit.chi2;stat.value)
Jstdap16.287 mag (jmstdap) J standard aperture magnitude (Note 18)   (phot.mag;em.IR.J)
e_Jstdap 0.197 mag (jmsigstdap) error on Jstdap (stat.error)
Hstdap15.933 mag (hmstdap) H standard aperture magnitude (Note 18)   (phot.mag;em.IR.H)
e_Hstdap 0.425 mag (hmsigstdap) error on Hstdap (stat.error)
Kstdap15.625 mag (kmstdap) K standard aperture magnitude (Note 18)   (phot.mag;em.IR.K)
e_Kstdap 0.302 mag (kmsigstdap) error on Kstdap (stat.error)
edgeNS 4334 arcsec (distedgens) Distance from the source to the nearest North or South scan edge (pos;arith.diff)
edgeEW142 arcsec (distedgeew) Distance from the source to the nearest East or West scan edge (pos;arith.diff)
edgese   [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)
optU   [0UT] (a) Associated optical source (Note 16)   (meta.id;meta.dataset)
Dopt 0.7 arcsec (dist_opt) Distance to associated optical source (pos.angDistance)
PAopt212 deg [0,360] (phi_opt) position angle from optical source to the 2MASS source position (pos.posAng)
Bmag17.60 mag (bmopt) Blue magnitude of associated optical source (phot.mag;em.opt.B)
Rmag17.30 mag (vrmopt) Visual or red mag of associated optical source (phot.mag;em.opt.R)
Nopt1  (nopt_mchs) Number of optical sources within 5arcsec (Note 17)   (meta.number)
extKey   (ext_key) Record Identifier in XSC (meta.id.cross)
scanKey26913  (scan_key) Record Identifier in the Scan Information Table (meta.id)
coaddKey 618995  (coadd_key) Record Identifier in the Atlas Image Data Table (meta.id;meta.dataset)
coadd220  (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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