• 2011-06-08 (MD): Silent update: 6169 objects copied from PPMX were affected by a PPMX bug that computed Ru magnitudes although at least one 2MASS magnitude was NULL. This resulted in large negative r1mags for these objects in PPMXL. The erroneous magnitudes have been set to NULL.
• 2016-04-20 (MD): Added vickers_pmra and vickers_pmde columns based on a global correction model for PPMXL proper motions as discussed in 2016AJ....151...99V.
• 2017-12-15 (MD): The corrections to USNO-B1 published in the the ppxml.usnocorr table had originally been computed against the original USNO-B rather than the version cleaned with Barron's list of spurious detections as advertised. This is now corrected. Individual corrections changed by up to 10%. If you used the table or the service ivo://org.gavo.dc/ppmxl/q/corr to correct positions obtained against USNO-B1, we advise to repeat the procedure with the corrected values.

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 (2016AJ....151...99V).

• stars
• Surveys
• Astrometry
• Proper motions

• ADQL query
• Correction to USNO-B
• Correction to UCAC-3

• Röser, S.
• Demleitner, M.
• Schilbach, E.
• Vickers, J. J.

• To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to PPMXL. For details, see the Creative Commons CC0 1.0 Public Domain dedication. Of course, you should still give proper credit when using this data as required by good scientific practice.

  
• https://spdx.org/licenses/CC0-1.0.html