Abstract. A first CCD 512 × 512 camera working in scan mode (declination field 14 ) was mounted in 1994 on the Bordeaux CCD meridian circle. After a testing period, this camera was installed on the Valinhos CCD meridian circle (near São Paulo, Brazil), as part of a collaboration between Bordeaux Observatory and the Instituto Astronomico e Geofisico of São Paulo. A second improved CCD 1024 × 1024 camera, with a declination field of 28 , was installed on the Bordeaux instrument in June 1996. The mean internal precision of a single observation is about 0.04 in both coordinates for 9 ≤ V ≤ 14. In the same magnitude range, magnitudes can also be obtained with an internal precision of about 0.05 mag. Both instruments can participate efficiently in extending the HipparcosTycho frame, during the next decade. Among other duties, the Bordeaux CCD meridian circle is being used since January 1997 for completing the Méridien 2000 project. The characteristics of both instruments and some results obtained with them are presented in this paper.

We present a proper motion catalogue of 2 670 974 stars, covering the declination zone +11• ≤ δ ≤ +18• . 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plates of the Bordeaux zone (scanned at the APM Cambridge), the AC2000.2 catalogue, the USNO−A2.0 catalogue and the unpublished Yellow Sky (YS3) USNO catalogue.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.

Abstract. During four years, systematic observations have been conducted in drift scan mode with the Bordeaux automated meridian circle in the declination band +11 • ≤ δ ≤ +18 • . The resulting astrometric catalog includes about 2.3 × 10 6 stars down to the magnitude limit VM = 16.3. Nearly all stars (96%) have been observed at least 6 times, the catalog being complete down to VM = 15.4. The median internal standard error in position is ∼35 mas in the magnitude range 11 < VM < 15, which degrades to ∼50 mas when the faintest stars are considered. M2000 also provides one band photometry with a median internal standard error of ∼0.04 mag. Comparisons with the Hipparcos and bright part of Tycho-2 catalogs have enabled us to estimate external errors in position to be lower than 40 mas. In this zone and at epoch 1998, the faint part of Tycho-2 is found to have an accuracy of 116 mas in α instead of 82 mas deduced from the model-based standard errors given in the catalog.