ppmxl.mainivo://xaovo/ppmxl/q/mainXinjiang Astronomical Observatory,CASRöser, S.; Demleitner, M.; Schilbach, E.2025-09-24T10:25:50Z2011-06-08Zhang Hailong150 Science 1-Street, Urumqi, Xinjiang 830011, Chinazhanghailong@xao.ac.cn+86 18699134012 PPMXL is a catalog of positions, proper motions, 2MASS- and optical
photometry of 900 million stars and galaxies, aiming to be complete
down to about V=20 full-sky. It is the result of a re-reduction of
USNO-B1 together with 2MASS to the ICRS as represented by PPMX.2010AJ....139.2440Rhttp://data.xao.ac.cn/tableinfo/ppmxl.mainppmxl PPMXL is a catalog of positions, proper motions, 2MASS- and optical
photometry of 900 million stars and galaxies, aiming to be complete
down to about V=20 full-sky. It is the result of a re-reduction of
USNO-B1 together with 2MASS to the ICRS as represented by PPMX.
ppmxl.main PPMXL is a catalog of positions, proper motions, 2MASS- and optical
photometry of 900 million stars and galaxies, aiming to be complete
down to about V=20 full-sky. It is the result of a re-reduction of
USNO-B1 together with 2MASS to the ICRS as represented by PPMX.ipixIdentifier (Q3C ipix of the USNO-B 1.0 object)meta.id;meta.mainlongindexedraj2000Right 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.rafloatindexednullablepmdeProper Motion in Decdeg/yrpos.pm;pos.eq.decfloatindexednullablee_pmraMean error in pmRA*cos(delta)deg/yrstat.error;pos.pm;pos.eq.rafloatnullablee_pmdeMean error in pmDEdeg/yrstat.error;pos.pm;pos.eq.decfloatnullablenobsNumber of observations usedmeta.number;obsshortnullableepraMean Epoch (RA)yrtime.epoch;pos.eq.rafloatnullableepdeMean Epoch (Dec)yrtime.epoch;pos.eq.decfloatnullablejmagJ selected default magnitude from 2MASSmagphot.mag;em.IR.Jfloatnullablee_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.Kfloatnullablee_kmagK_s total magnitude uncertaintymagstat.error;phot.mag;em.IR.Kfloatnullableb1magB mag from USNO-B, first epochphot.mag;em.opt.Bfloatnullableb2magB mag from USNO-B, second epochphot.mag;em.opt.Bfloatnullabler1magR mag from USNO-B, first epochphot.mag;em.opt.Rfloatnullabler2magR mag from USNO-B, second epochphot.mag;em.opt.RfloatnullableimagI mag from USNO-Bphot.mag;em.opt.IfloatnullablemagsurveysSurveys the USNO-B magnitudes are taken frommeta.codecharnullableflagsFlagsmeta.codeshort