Journal Article

An investigation of the absolute proper motions of the XPM catalogue

P. N. Fedorov, V. S. Akhmetov, V. V. Bobylev and A. T. Bajkova

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 3, pages 1734-1744
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI:
An investigation of the absolute proper motions of the XPM catalogue

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XPM-1.0 is the regular version of the XPM catalogue. In comparison with XPM, this astrometric catalogue of about 280 millions stars covering the entire sky from −90° to +90° in declination and in the magnitude range 10 < B < 22 mag is somewhat improved. The general procedural steps were followed as for XPM, but some of these were performed on a more sophisticated level. The XPM-1.0 catalogue contains the star positions, the proper motions and the Two-Micron All-Sky Survey (2MASS) and United States Naval Observatory (USNO) photometry of about 280 million sources. We present some investigations of the absolute proper motions of the XPM-1.0 catalogue and also important information for users of the catalogue. Unlike the previous version, XPM-1.0 contains proper motions over the whole sky without gaps. In fields covering the zone of avoidance or those that contain fewer than 25 galaxies, quasi-absolute calibration was performed. The proper motion errors vary from 3 to 10 mas yr−1, depending on a specific field. The zero-point of the absolute proper motion frame (the absolute calibration) was specified with more than one million galaxies from 2MASS and USNO-A2.0. The mean formal error of absolute calibration is less than 1 mas yr−1.

Keywords: catalogues; astrometry; reference systems

Journal Article.  7840 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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