The investigation of absolute proper motions of the XPM Catalogue

TL;DR

This paper presents the XPM-1.0 star catalog with improved proper motion data for about 280 million stars across the entire sky, utilizing a refined calibration process to enhance accuracy and completeness.

Contribution

The paper introduces the XPM-1.0 catalog with comprehensive sky coverage and improved proper motion accuracy, including a new absolute calibration method using over a million galaxies.

Findings

Proper motion errors range from 3 to 10 mas/yr.

The catalog covers the entire sky without gaps.

Absolute proper motion zero-point calibrated with over 1 million galaxies.

Abstract

The XPM-1.0 is the regular version of the XPM catalogue. In comparison with XPM the astrometric catalogue of about 280 millions stars covering entire sky from -90 to +90 degrees in declination and in the magnitude range 10^m<B<22^m is something improved. The general procedure steps were followed as for XPM, but some of them are now performed on a more sophisticated level. The XPM-1.0 catalogue contains star positions, proper motions, 2MASS and USNO photometry of about 280 millions of the sources. We present some investigations of the absolute proper motions of XPM-1.0 catalogue and also the important information for the users of the catalogue. Unlike previous version, the XPM-1.0 contains the proper motions over the whole sky without gaps. In the fields, which cover the zone of avoidance or which contain less than of 25 galaxies a quasi absolute calibration was performed. The proper motion errors are varying from 3 to 10 mas/yr, depending on a specific field. The zero-point of the absolute proper motion frame (the absolute calibration) was specified with more than 1 million galaxies from 2MASS and USNO-A2.0. The mean formal error of absolute calibration is less than 1 mas/yr.