II/246ivo://CDS.VizieR/II/246CDSCutri R.M.Skrutskie M.F.Van Dyk S.Beichman C.A.Carpenter J.M.,Chester T.Cambresy L.Evans T.Fowler J.Gizis J.Howard E.,Huchra J.Jarrett T.Kopan E.L.Kirkpatrick J.D.Light R.M,Marsh K.A.McCallon H.Schneider S.Stiening R.Sykes M.,Weinberg M.Wheaton W.A.Wheelock S.Zacarias N.2025-03-11T06:46:29Z2008-01-10T23:19:42ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frinfrared-sourcesinfrared-photometrysurveysThe Two Micron All Sky Survey (2MASS) project is designed to close the gap between our current technical capability and our knowledge of the near-infrared sky. In addition to providing a context for the interpretation of results obtained at infrared and other wavelengths, 2MASS will provide direct answers to immediate questions on the large-scale structure of the Milky Way and the Local Universe. To achieve these goals, 2MASS is uniformly scanning the entire sky in three near-infrared bands to detect and characterize point sources brighter than about 1 mJy in each band, with signal-to-noise ratio (SNR) greater than 10, using a pixel size of 2.0". This will achieve an 80,000-fold improvement in sensitivity relative to earlier surveys. 2MASS uses two new, highly-automated 1.3-m telescopes, one at Mt. Hopkins, AZ, and one at CTIO, Chile. Each telescope is equipped with a three-channel camera, each channel consisting of a 256x256 array of HgCdTe detectors, capable of observing the sky simultaneously at J (1.25 {mu}m), H (1.65 {mu}m), and Ks (2.17 {mu}m), to a 3{sigma} limiting sensitivity of 17.1, 16.4 and 15.3mag in the three bands. The 2MASS arrays image the sky while the telescopes scan smoothly in declination at a rate of ~1' per second. The 2MASS data "tiles" are 6 deg. long in the declination direction and one camera frame (8.5') wide. The camera field-of-view shifts by ~1/6 of a frame in declination from frame-to-frame. The camera images each point on the sky six times for a total integration time of 7.8 s, with sub-pixel "dithering", which improves the ultimate spatial resolution of the final Atlas Images. The University of Massachusetts (UMass) is responsible for the overall management of the project, and for developing the infrared cameras and on-site computing systems at both facilities. The Infrared Processing and Analysis Center (IPAC) is responsible for all data processing through the Production Pipeline, and construction and distribution of the data products. The 2MASS project involves the participation of members of the Science Team from several different institutions. The 2MASS project is funding by the National Aeronautics and Space Administration (NASA) and the National Science Foundation (NSF).2003yCat.2246....0Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/II/246CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.ipac.caltech.edu/2mass/ : 2MASS documentationVII/233 : The Two Micron All-Sky Survey: Extended sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=II/246https://vizier.iucaa.in/viz-bin/VizieR-2?-source=II/246http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=II/246https://vizier.cds.unistra.fr/viz-bin/votable?-source=II/246https://vizier.iucaa.in/viz-bin/votable?-source=II/246http://vizieridia.saao.ac.za/viz-bin/votable?-source=II/246GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table II/246/out (2MASS Point Source Catalogue, output (on a total of 470,992,970 sources))https://vizier.cds.unistra.fr/viz-bin/conesearch/II/246/out?https://vizier.iucaa.in/viz-bin/conesearch/II/246/out?http://vizieridia.saao.ac.za/viz-bin/conesearch/II/246/out?GETtext/xml+votable180.050000true44.996054890.005565050.005555555555555556Hips catalogue for table II/246/outhttps://hipscat.cds.unistra.fr/HiPSCatService/II/246/out0/0-11 6/7.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/II/246?format=asciiInfrareddefaultII/246/out2MASS Point Source Catalogue, output (on a total of 470,992,970 sources)RAJ2000(ra) Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000(dec) Declination (J2000) (dec)degpos.eq.dec;meta.mainindexederrMaj(err_maj) Semi-major axis of position error ellipsearcsecstat.errorfloaterrMin(err_min) Semi-minor axis of position error ellipsearcsecstat.errorfloaterrPA[0,180] (err_ang) Position angle of error ellipse major axis (E of N)degstat.errorint2MASS(designation) Source designation (1)meta.id;meta.maincharprimaryJmag?(j_m) J selected default magnitude (2)magphot.mag;em.IR.JfloatnullableindexedJcmsig?(j_cmsig) J default magnitude uncertainty (3)magstat.error;phot.magfloatnullablee_Jmag?(j_msigcom) J total magnitude uncertainty (4)magstat.error;phot.magfloatnullableJsnr?(j_snr) J Signal-to-noise ratiostat.snrdoublenullableHmag?(h_m) H selected default magnitude (2)magphot.mag;em.IR.HfloatnullableindexedHcmsig?(h_cmsig) H default magnitude uncertainty (3)magstat.error;phot.magfloatnullablee_Hmag?(h_msigcom) H total magnitude uncertainty (4)magstat.error;phot.magfloatnullableHsnr?(h_snr) H Signal-to-noise ratiostat.snrdoublenullableKmag?(k_m) K selected default magnitude (2)magphot.mag;em.IR.KfloatnullableindexedKcmsig?(k_cmsig) K default magnitude uncertainty (3)magstat.error;phot.magfloatnullablee_Kmag?(k_msigcom) K total magnitude uncertainty (4)magstat.error;phot.magfloatnullableKsnr?(k_snr) K Signal-to-noise ratiostat.snrdoublenullableQflg(ph_qual) JHK Photometric quality flag (5)meta.code.qual;photcharRflg(rd_flg) Source of JHK default mag (6)meta.refcharBflg(bl_flg) JHK components fit to source (7)meta.codecharCflg(cc_flg) Artifact contamination, confusion (8)meta.codecharNdet(ndet) Number of aperture measurements (jjhhkk) (9)meta.numbercharproxDistance between source and nearest neighbourarcsecpos.angDistancefloatpxPA? (pxpa) Position angle of vector from source to nearest neighbour (E of N)degpos.posAngintnullablepxCntr(pxcntr) Sequence number of nearest neighbourmeta.numberXflg[0,2] (gal_contam) Extended source contamination (10)meta.codeintAflg[0,1] (mp_flg) Association with asteroid or comet (11)meta.codeintCntr(pts_key) Unique source identifier in cataloguemeta.id;meta.tablelongHemis[ns] (hemis) Hemisphere of observationobs.param;obscharDate(date) Observation datetime.epoch;obscharScan(scan) Scan number (within date)obs.fieldintGLON(glon) Galactic longitude (12)degpos.galactic.lonGLAT(glat) Galactic latitude (12)degpos.galactic.latfloatXscan(x_scan) Distance of source from focal plane centerlinearcsecpos.cartesian;instr.detfloatJpsfchi?(j_psfchi) J band reduced chi2 value of fitstat.fit.chi2;stat.valuefloatnullableHpsfchi?(h_psfchi) H band reduced chi2 value of fitstat.fit.chi2;stat.valuefloatnullableKpsfchi?(k_psfchi) K band reduced chi2 value of fitstat.fit.chi2;stat.valuefloatnullableJstdap?(j_m_stdap) J standard aperture magnitude (18)magphot.mag;em.IR.Jfloatnullablee_Jstdap?(j_msig_stdap) error on Jstdapmagstat.errorfloatnullableHstdap?(h_m_stdap) H standard aperture magnitude (18)magphot.mag;em.IR.Hfloatnullablee_Hstdap?(h_msig_stdap) error on Hstdapmagstat.errorfloatnullableKstdap?(k_m_stdap) K standard aperture magnitude (18)magphot.mag;em.IR.Kfloatnullablee_Kstdap?(k_msig_stdap) error on Kstdapmagstat.errorfloatnullableedgeNS(dist_edge_ns) Distance from the source to the nearest North or South scan edgearcsecpos;arith.diffintedgeEW(dist_edge_ew) Distance from the source to the nearest East or West scan edgearcsecpos;arith.diffintedge[nsew] (dist_edge_flg) flag indicating to which edges the edgeNS and edgeEW values referpos.cartesian;instr.detchardup(dup_src) Flag indicating duplicate source (14)meta.codeintuse(use_src) Use source flag (15)meta.codeintopt[0UT] (a) Associated optical source (16)meta.id;meta.datasetcharDopt?(dist_opt) Distance to associated optical sourcearcsecpos.angDistancefloatnullablePAopt[0,360]? (phi_opt) position angle from optical source to the 2MASS source positiondegpos.posAngintnullableBmag?(b_m_opt) Blue magnitude of associated optical sourcemagphot.mag;em.opt.BfloatnullableRmag?(vr_m_opt) Visual or red mag of associated optical sourcemagphot.mag;em.opt.RfloatnullableNopt(nopt_mchs) Number of optical sources within 5arcsec (17)meta.numberintextKey?(ext_key) Record Identifier in XSCmeta.id.crossintnullablescanKey(scan_key) Record Identifier in the Scan Information Tablemeta.idintcoaddKey(coadd_key) Record Identifier in the Atlas Image Data Tablemeta.id;meta.datasetintcoadd(coadd) Sequence number of the Atlas Imagemeta.numberintOptShow the nearby Optical Sources from USNO and GSC Cataloguesmeta.ref.urlcharJD(jdate) Julian date of source measurement (13)dtime.epochdoubleindexed