ucac5.mainivo://org.gavo.dc/ucac5/q/mainThe GAVO DC teamZacharias, N.Finch, C.Frouard, J.2017-02-27T00:00:00ZGAVO Data Centre Team

Mönchhofstrasse 12-14, D-69120 Heidelberg

gavo@ari.uni-heidelberg.de+49 6221 54 1837surveysastrometryproper-motions New astrometric reductions of the US Naval Observatory CCD Astrograph Catalog (UCAC) all-sky observations were performed from first principles using the TGAS stars in the 8 to 11 magnitude range as reference star catalog. Significant improvements in the astrometric solutions were obtained and the UCAC5 catalog of mean positions at a mean epoch near 2001 was generated. By combining UCAC5 with Gaia DR1 data new proper motions on the Gaia coordinate system for over 107 million stars were obtained with typical accuracies of 1 to 2 mas/yr (R = 11 to 15 mag), and about 5 mas/yr at 16th mag. Proper motions of most TGAS stars are improved over their Gaia data and the precision level of TGAS proper motions is extended to many millions more, fainter stars. The database table uses actual NULLs for missing photometry, and all angular coordinates have been homogenised to degrees.2017arXiv170205621Zhttp://dc.g-vo.org/tableinfo/ucac5.main0/0-1157023 570238.277e-20 4.138e-19Opticalucac5 New astrometric reductions of the US Naval Observatory CCD Astrograph Catalog (UCAC) all-sky observations were performed from first principles using the TGAS stars in the 8 to 11 magnitude range as reference star catalog. Significant improvements in the astrometric solutions were obtained and the UCAC5 catalog of mean positions at a mean epoch near 2001 was generated. By combining UCAC5 with Gaia DR1 data new proper motions on the Gaia coordinate system for over 107 million stars were obtained with typical accuracies of 1 to 2 mas/yr (R = 11 to 15 mag), and about 5 mas/yr at 16th mag. Proper motions of most TGAS stars are improved over their Gaia data and the precision level of TGAS proper motions is extended to many millions more, fainter stars. The database table uses actual NULLs for missing photometry, and all angular coordinates have been homogenised to degrees.ucac5.main New astrometric reductions of the US Naval Observatory CCD Astrograph Catalog (UCAC) all-sky observations were performed from first principles using the TGAS stars in the 8 to 11 magnitude range as reference star catalog. Significant improvements in the astrometric solutions were obtained and the UCAC5 catalog of mean positions at a mean epoch near 2001 was generated. By combining UCAC5 with Gaia DR1 data new proper motions on the Gaia coordinate system for over 107 million stars were obtained with typical accuracies of 1 to 2 mas/yr (R = 11 to 15 mag), and about 5 mas/yr at 16th mag. Proper motions of most TGAS stars are improved over their Gaia data and the precision level of TGAS proper motions is extended to many millions more, fainter stars. The database table uses actual NULLs for missing photometry, and all angular coordinates have been homogenised to degrees.110000000source_idGaia source IDmeta.id;meta.main448738183320323.076592671645764e+174.2013910933282806e+186.720608487973016e+1869175286496842024961.0longraGaia DR1 Right Ascension at epoch J2015.0degpos.eq.ra;meta.main1.66667e-0625.1937239.959338.4843601doubleindexednullabledecGaia DR1 Declination at epoch J2015.0degpos.eq.dec;meta.main-89.948-69.5278-16.804363.661589.85931doubleindexednullablera_errorStandard error of ra (with cos δ applied); from Gaia DR1.degstat.error;pos.eq.ra02.77778e-088.33333e-083.83333e-062.77222e-051floatnullabledec_errorStandard error of dec; from Gaia DR1.degstat.error;pos.eq.dec02.77778e-085.55556e-083.58333e-062.76944e-051floatnullablesrcflagsSource for the star: 1 = TGAS, 2 = other UCAC-Gaia star, 3 = other NOMADmeta.code12.02.03.031.0shortnu1Number of images used for UCAC mean positionmeta.number00.02.07.0481.0shortepuMean UCAC epoch (i.e. epoch for ra_ucac and de_ucac)yrtime.epoch1998.121998.221999.92003.712004.381floatnullablera_ucacMean UCAC RA at epoch epu on Gaia reference framedegpos.eq.ra1.02778e-0525.1938239.959338.4843601doublenullablede_ucacmean UCAC Dec at epoch epu on Gaia reference framedegpos.eq.dec-89.9478-69.5278-16.804363.661689.85921doublenullablepmraPM(RA), cos(δ) applied, computed from UCAC and Gaia DR1 positions.deg/yrpos.pm;pos.eq.ra-0.000340944-6.80556e-06-6.38889e-075.61111e-060.0003886671floatnullablepmdePM(Dec), computed from UCAC positions and Gaia DR1 positions.deg/yrpos.pm;pos.eq.dec-0.000405-7.55556e-06-7.5e-075e-060.0003999441floatnullablesigpmrStandard error of proper motion in RA*cos(Dec)deg/yrstat.error;pos.pm;pos.eq.ra1.94444e-072.77778e-071e-065.83333e-062.44444e-051floatnullablesigpmdStandard error of proper motion in Decdeg/yrstat.error;pos.pm;pos.eq.dec1.94444e-072.77778e-071e-065.58333e-062.44167e-051floatnullablegmagGaia DR1 G magnitudemagphot.mag;em.opt3.32712.00615.45816.80321.5111floatnullableumagMean UCAC model magnitude (20 in the source is mapped to NULL)magphot.mag;em.opt.V3.88512.30215.87417.16718.30.998539floatnullablermagNOMAD photographic R mag (0 and 30 in the source are mapped to NULL)magphot.mag;em.opt.R2.3111.6815.2116.74250.86721floatnullablejmag2MASS J magnitude (0 and 30 in the source are mapped to NULL)magphot.mag;em.IR.J0.48210.32813.84215.46218.5220.897972floatnullablehmag2MASS H magnitude (0 and 30 in the source are mapped to NULL)magphot.mag;em.IR.H-0.4769.70513.38315.10218.9890.897971floatnullablekmag2MASS K_s magnitude (0 and 30 in the source are mapped to NULL)magphot.mag;em.IR.K-0.6629.50513.26615.02319.8650.897969floatnullable