SPM4 CSivo://xaovo/spm4/q/coneXinjiang Astronomical Observatory,CASGirard, T. M.; van Altena, W. F.; Zacharias, N.; Vieira, K.; Casetti-Dinescu, D. I.; Castillo, D.; Herrera, D.; Lee, Y. S.; Beers, T. C.; Monet, D. G.; López, C. E.2025-09-24T05:22:08ZZhang Hailong

150 Science 1-Street, Urumqi, Xinjiang 830011, China

zhanghailong@xao.ac.cn+86 18699134012CatalogsStars: Proper Motions The SPM4 Catalog contains absolute proper motions, celestial coordinates, and B,V photometry for 103,319,647 stars and galaxies between the south celestial pole and -20 degrees declination. The catalog is roughly complete to V=17.5. It is based on photographic and CCD observations taken with the Yale Southern Observatory's double-astrograph at Cesco Observatory in El Leoncito, Argentina.2011AJ....142...15Ghttps://data.xao.ac.cn/spm4/q/cone/info This data essentially is a mirror of http://www.astro.yale.edu/astrom/spm4cat/spm4.html. If you use it, please reference 2011AJ....142...15G.Opticalspm4 The SPM4 Catalog contains absolute proper motions, celestial coordinates, and B,V photometry for 103,319,647 stars and galaxies between the south celestial pole and -20 degrees declination. The catalog is roughly complete to V=17.5. It is based on photographic and CCD observations taken with the Yale Southern Observatory's double-astrograph at Cesco Observatory in El Leoncito, Argentina.spm4.main The SPM4 Catalog contains absolute proper motions, celestial coordinates, and B,V photometry for 103,319,647 stars and galaxies between the south celestial pole and -20 degrees declination. The catalog is roughly complete to V=17.5. It is based on photographic and CCD observations taken with the Yale Southern Observatory's double-astrograph at Cesco Observatory in El Leoncito, Argentina.spmidUnique SPM4 id (field number + input catalog line number)meta.id;meta.maincharindexednullableraj2000Right Ascension (ICRS, epoch=2000.0)degpos.eq.ra;meta.maindoubleindexednullabledej2000Declination (ICRS, epoch=2000.0)degpos.eq.dec;meta.maindoubleindexednullablee_raj2000Expected uncertainty in Right Ascension at mean epochdegstat.error;pos.eq.ra;meta.mainfloatnullablee_dej2000Expected uncertainty in Declination at mean epochdegstat.error;pos.eq.dec;meta.mainfloatnullablepmraAbsolute proper motion in RA (mu_alpha*cos(Dec))deg/yrpos.pm;pos.eq.rafloatnullablepmdeAbsolute proper motion in Declinationdeg/yrpos.pm;pos.eq.decfloatnullablee_pmraExpected uncertainty in proper motion in RA (mu_alpha*cos(Dec)), at mean epochdeg/yrstat.error;pos.pm;pos.eq.rafloatnullablee_pmdeExpected uncertainty in proper motion in Declination, at mean epoch.deg/yrstat.error;pos.pm;pos.eq.decfloatnullablemagbB magnitudemagphot.mag;em.opt.BfloatnullablemagvV magnitudemagphot.mag;em.opt.Vfloatindexednullablei_magbsource flag for B magnitudemeta.flag;phot.mag;em.opt.Bchari_magvsource flag for V magnitudemeta.flag;phot.mag;em.opt.VcharmeanepWeighted mean epochyrtime.epochfloatnullableep1Weighted mean epoch of first observationyrtime.epochfloatnullableep2Weighted mean epoch of second observationyrtime.epochfloatnullablenplates1Number of 1st epoch plates usedmeta.number;instr.plateshortnplates2Number of 2nd epoch plates usedmeta.number;instr.plateshortnccd2Number of 2nd epoch ccd frames usedmeta.numbershorti_galGalaxy/extended-source flagsrc.class.starGalaxyshorti_catCode for the input catalogmeta.codeshortmagjJ selected default magnitude from 2MASSmagphot.mag;em.IR.JfloatnullablemaghH selected default magnitude from 2MASSmagphot.mag;em.IR.HfloatnullablemagkK_s selected default magnitude from 2MASSmagphot.mag;em.IR.Kfloatnullable