Abstract
We present a proper motion catalogue of 2 670 974 stars, covering the declination zone $+11\degr \leq \delta \leq +18 \degr$. Proper motions were derived from the comparison of the positional M2000 catalogue (systematic observations of the Bordeaux Carte du Ciel Zone with the meridian circle, completed in 2000) with positions derived from the reduction of 512 Carte du Ciel plates of the Bordeaux zone (scanned at the APM Cambridge), the AC2000.2 catalogue, the USNO-A2.0 catalogue and the unpublished Yellow Sky (YS3) USNO catalogue. The catalogue has a limiting magnitude $V_{M}=16.2$ (Bordeaux CCD meridian circle magnitude) and is complete down to $V_{M}=15.4$. Depending on magnitude, the positional precision at mean epoch ranges from 50 to 70 mas and the precision of proper motions varies from 1.5 mas/yr to 6 mas/yr. Meridian V M magnitudes are provided for all objects together with additional photometry from the 2MASS catalogue when available (99.5% of objects). Positions and proper motions are on the ICRS (International Celestial Reference System). Systematic offsets in 2MASS positions and in UCAC2 proper motions were revealed from comparisons with PM2000.
Highlights
PM2000 is a project that started in 1998 at Bordeaux Observatory aiming at the production of a catalogue of accurate proper motions for all stars brighter than V = 15.4 in the Bordeaux Carte du Ciel zone (+11◦ ≤ δ ≤ +18◦)
Proper motions were derived from the comparison of the positional M2000 catalogue with positions derived from the reduction of 512 Carte du Ciel plates of the Bordeaux zone, the AC2000.2 catalogue, the USNO−A2.0 catalogue and the unpublished Yellow Sky (YS3) USNO catalogue
This paper presents the combination of the Bordeaux Carte du Ciel plates measurements, the M2000 observations and three other sources of astrometry (AC2000.2, USNO–A2.0 and YS3) to derive accurate proper motions for all stars from the M2000 catalogue (VM ≤ 16.2) in the declination zone +11◦ ≤ δ ≤ +18◦
Summary
The only accurate astrometric proper motion catalogue for faint objects is the UCAC2 catalogue It provides accurate positions and proper motions for most stars brighter than R = 16 in a large part of the sky. The PM2000 project is an independent effort to give, in 1/20th of the sky, accurate proper motions for bright and faint stars (V ≤ 16.2) using the Carte du Ciel plates as first epoch. These plates (generally taken around 1900) provide good photographic positions for most stars brighter than V ≤ 14 and up to V = 16.2. VM magnitudes are derived from the M2000 catalogue, and whenever possible photometry from the 2MASS survey is included
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