M2000 : an astrometric catalog in the Bordeaux Carte du Ciel zone +11 degrees < {delta} < +18 degrees

• Published in: arXiv.org 2001-09
• Main Authors: Rapaport, M, -F Le Campion, J, Soubiran, C, Daigne, G, J -P Perie, Bosq, F, Colin, J, J -M Desbats, Ducourant, C, J -M Mazurier, Montignac, G, Ralite, N, Requieme, Y, Viateau, B
• Format: Article
• Language: English
• Subjects: Declination; Photometry; Standard error; Stars
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.0109204

During four years, systematic observations have been conducted in drift scan mode with the Bordeaux automated meridian circle in the declination band [+11 ; +18]. The resulting astrometric catalog includes about 2 300 000 stars down to the magnitude limit V_M=16.3. Nearly all stars (96%) have been observed at least 6 times, the catalog being complete down to V_M=15.4. The median internal standard error in position is about 35 mas in the V_M magnitude range [11 ; 15], which degrades to about 50 mas when the faintest stars are considered. M2000 provides also 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 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 alpha instead of 82 mas deduced from the model-based standard errors given in the catalog.