Hsoy Object Cataloghsoy.mainivo://org.gavo.dc/hsoy/q/maindoi:10.21938/HP1ASPBYWElyXb6qdqyolgThe GAVO DC teamDemleitner, M.Röser, S.Altmann, M.Bastian, U.Schilbach, E.2017-02-01T00:00:00Z2017-01-31GAVO Data Center TeamMönchhofstrasse 12-14, D-69120 Heidelberggavo@ari.uni-heidelberg.de++49 6221 54 1837starssurveysastrometryproper-motions
HSOY is a catalog of 583'001'653 objects with precise astrometry based on
PPMXL and Gaia DR1. Typical formal errors at mean epoch in proper motion are
below 1 mas/yr for objects brighter than 10 mag, and about 5 mas/yr at the
faint end (about 20 mag). South of -30 degrees, astrometry is significantly
worse. HSOY also contains, where available, USNO-B, Gaia, and 2MASS
photometry. HSOY's positions and proper motions are given for epoch J2000.
The catalog becomes severely incomplete faintwards of 16 mag in the G-band.
The mean epochs are typically very close to Gaia's J2015.
HSOY still contains about 0.7% spurious close
"binaries" (non-matched stars) from the original USNO-B (marked with non-NULL
clone). Also, failed matches within Gaia DR1 contribute another 1.5% spurious
pairs (marked with non-NULL comp). In both cases, astrometry presumably is
sub-standard.
More information is available at http://dc.g-vo.org/hsoy.https://dc.zah.uni-heidelberg.de/tableinfo/hsoy.mainResearchGaia0/0-1151544 515448.277e-20 5.369e-19OpticalhsoyThe HSOY Catalog
HSOY is a catalog of 583'001'653 objects with precise astrometry based on
PPMXL and Gaia DR1. Typical formal errors at mean epoch in proper motion are
below 1 mas/yr for objects brighter than 10 mag, and about 5 mas/yr at the
faint end (about 20 mag). South of -30 degrees, astrometry is significantly
worse. HSOY also contains, where available, USNO-B, Gaia, and 2MASS
photometry. HSOY's positions and proper motions are given for epoch J2000.
The catalog becomes severely incomplete faintwards of 16 mag in the G-band.
The mean epochs are typically very close to Gaia's J2015.
HSOY still contains about 0.7% spurious close
"binaries" (non-matched stars) from the original USNO-B (marked with non-NULL
clone). Also, failed matches within Gaia DR1 contribute another 1.5% spurious
pairs (marked with non-NULL comp). In both cases, astrometry presumably is
sub-standard.
More information is available at http://dc.g-vo.org/hsoy.
hsoy.mainHsoy Object Catalog
HSOY is a catalog of 583'001'653 objects with precise astrometry based on
PPMXL and Gaia DR1. Typical formal errors at mean epoch in proper motion are
below 1 mas/yr for objects brighter than 10 mag, and about 5 mas/yr at the
faint end (about 20 mag). South of -30 degrees, astrometry is significantly
worse. HSOY also contains, where available, USNO-B, Gaia, and 2MASS
photometry. HSOY's positions and proper motions are given for epoch J2000.
The catalog becomes severely incomplete faintwards of 16 mag in the G-band.
The mean epochs are typically very close to Gaia's J2015.
HSOY still contains about 0.7% spurious close
"binaries" (non-matched stars) from the original USNO-B (marked with non-NULL
clone). Also, failed matches within Gaia DR1 contribute another 1.5% spurious
pairs (marked with non-NULL comp). In both cases, astrometry presumably is
sub-standard.
More information is available at http://dc.g-vo.org/hsoy.590000000ipixThe PPMXL object identifier, which in turn is the q3c ipix of the original USNO-B object; for HSOY, only (ipix, comp) is a unique identifier (primary key). The recommended identifier form is 'HSOY ipix.comp', where comp=0 for NULL comps. This is what the SCS generates.meta.id.crosslongindexedcompIf non-null this indicates that multiple Gaia objects matched the PPMXL object; this may indicate bona fide multiple stars, but more likely is due to failed matching of Gaia observations at different epochs. In both cases, proper motions must be used with care. The index is artificial, i.e., no primary, secondary, etc, is implied. ipix+comp together are a primary key to hsoy.main.meta.code.multipshortnullableraj2000Right Ascension J2000.0, epoch 2000.0degpos.eq.ra;meta.maindoubleindexednullabledej2000Declination J2000.0, epoch 2000.0degpos.eq.dec;meta.maindoubleindexednullablee_raepraMean error in RA*cos(delta) at mean epochdegstat.error;pos.eq.ra;meta.mainfloatnullablee_deepdeMean error in Dec at mean epochdegstat.error;pos.eq.dec;meta.mainfloatnullablepmraProper Motion in RA*cos(delta)deg/yrpos.pm;pos.eq.rafloatnullablepmdeProper Motion in Decdeg/yrpos.pm;pos.eq.decfloatnullablee_pmraMean error in pmRA*cos(delta)deg/yrstat.error;pos.pm;pos.eq.rafloatnullablee_pmdeMean error in pmDEdeg/yrstat.error;pos.pm;pos.eq.decfloatnullableepraMean Epoch (RA)yrtime.epoch;pos.eq.rafloatnullableepdeMean Epoch (Dec)yrtime.epoch;pos.eq.decfloatnullablejmagJ selected default magnitude from 2MASSmagphot.mag;em.IR.Jfloatindexednullablee_jmagJ total magnitude uncertaintymagstat.error;phot.mag;em.IR.JfloatnullablehmagH selected default magnitude from 2MASSmagphot.mag;em.IR.Hfloatnullablee_hmagH total magnitude uncertaintymagstat.error;phot.mag;em.IR.HfloatnullablekmagK_s selected default magnitude from 2MASSmagphot.mag;em.IR.Kfloatindexednullablee_kmagK_s total magnitude uncertaintymagstat.error;phot.mag;em.IR.Kfloatnullableb1magB mag from USNO-B, first epochmagphot.mag;em.opt.Bfloatnullableb2magB mag from USNO-B, second epochmagphot.mag;em.opt.Bfloatnullabler1magR mag from USNO-B, first epochmagphot.mag;em.opt.Rfloatnullabler2magR mag from USNO-B, second epochmagphot.mag;em.opt.RfloatnullableimagI mag from USNO-Bmagphot.mag;em.opt.IfloatnullablemagsurveysSurveys the USNO-B magnitudes are taken frommeta.codecharnullablenobsNumber of observations contributing to this column (always nobs(ppmxl)+1)meta.number;obsshortnullablegaia_idUnique source identifiermeta.idlongindexednullablephot_g_mean_magMean magnitude in the G band from Gaia DR1. Magnitudes for which err_flux/flux>0.1 have been dropped.magphot.mag;em.opt;stat.meanfloatindexednullablee_phot_g_mean_magEstimated error in Gaia G-band magnitude. This is estimated as 1.09*err_flux/flux which is good as a symmetric 1 σ-error of the magnitude to at least within a few percent when err_flux/flux is smaller than 0.1, as it is for the HSOY objects.s**-1stat.error;phot.mag;em.opt.VfloatnullablecloneIf 1, more than one PPMXL object matched to this Gaia object (i.e.: proper motion is probably wrong, any apparent duplicity is probably spurious). This is normally due to failed matching of objects from different plates in USNO-B.meta.code.qualshortnullableno_sc1 if this object had no match within 3 arcseconds in SuperCosmos at J2000. It is very likely that it is not a real object. NOTE: False is encoded as NULL in the database; to exclude objects without a supercosmos match, write no_sc IS NULL.meta.code.qualshortnullable