The PPMXL Catalogppmxl.usnocorrivo://org.gavo.dc/ppmxl/q/usnocorrdoi:10.21938/puTViqDkMGcQZu8LSDZ5SgThe GAVO DC teamRöser, S.Demleitner, M.Schilbach, E.Vickers, J. J.2016-04-14T00:00:00Z2011-06-082016-04-202017-12-15GAVO Data Centre TeamMönchhofstrasse 12-14, D-69120 Heidelberggavo@ari.uni-heidelberg.de+49 6221 54 1837starssurveysastrometryproper-motionsCorrections between USNO-B1 and PPMXL on a grid of degrees, obtained
by substracting PPMXL from USNO in cones of radius sqrt(2)/2 degrees
around the given center position.2010AJ....139.2440Rhttp://dc.g-vo.org/tableinfo/ppmxl.usnocorr0/0-118.332e-20 5.369e-19ppmxlThe PPMXL Catalog
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. This service additionally provides improved proper
motions computed according to Vickers et al, 2016
(:bibcode:`2016AJ....151...99V`).
ppmxl.usnocorrCorrections between USNO-B1 and PPMXL on a grid of degrees, obtained
by substracting PPMXL from USNO in cones of radius sqrt(2)/2 degrees
around the given center position.64800nobNumber of objects the correction is based onmeta.number18158168.019271.0132741.499999999944534101.0intalphaCenter for field, RAdegpos.eq.ra;meta.main0.510.5180349.5359.51floatindexednullabledeltaCenter for field, Decdegpos.eq.dec;meta.main-89.5-84.5084.589.51floatindexednullabled_alphaCorrection PPMXL-USNO in alpha (Epoch 2000.0)degpos.eq.ra;arith.diff-0.0133948-0.00122579-4.56111e-059.39135e-050.001097611floatnullabled_deltaCorrection PPMXL-USNO in delta (Epoch 2000.0)degpos.eq.dec;arith.diff-0.000136125-5.45663e-058.55515e-079.37356e-050.0001790651floatnullabled_pmalphaCorrection PPMXL-USNO in proper motion alpha*cos(delta)deg/yrpos.pm;pos.eq.ra;arith.diff-4.30888e-06-2.32278e-06-3.40458e-072.13868e-064.92653e-061floatnullabled_pmdeltaCorrection PPMXL-USNO in deltadeg/yrpos.pm;pos.eq.dec;arith.diff-4.4126e-06-2.16193e-06-6.47953e-071.99619e-064.65377e-061floatnullable