Information on resource 'The 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 (2016AJ....151...99V).

To query this data, you can use

You can retrieve also the whole data set as a gzipped text file from http://vo.ari.uni-heidelberg.de/ppmxl (43.5 GiB). The columns in the text file are in database order as documented in the table info in DB order with columns separated by vertical bars ("|").

If you run DaCHS yourself, you can use a C booster kindly provided by Hailong Zhang. Instructions on usage are at the head of the file.

David Tholen kindly provided code to convert this into a collection of files for easy consumption by FORTRAN programs.

In 2016, John Vickers provided a global correction of the PPMXL proper motions based on extragalactic objects (2016AJ....151...99V). The results are given in the vickers_pmra and vickers_pmde columns. The coefficients we used are available at pmr-coefficients.csv and pmd-coefficients.csv. When used with the Code we actually used to compute the corrected values (adding healpix interpolation to the upstream from https://github.com/johnjvickers/PPMXL_Correction), these files have to be renamed pmr.csv and pmd.csv, respectively.

Services defined within this resource descriptor

Tables defined within this resource descriptor

Copyright, License, Acknowledgements

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.

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