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

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.Comment: The catalogue can be fetched directly from: ftp://cdsarc.u-strasbg.fr/cats/I/272 or queried from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=I/272 More information at : http://www.observ.u-bordeaux.fr/~soubiran/m2000.ht

CCD MERIDIAN CIRCLE REDUCTIONS USING TYCHO POSITIONS AS REFERENCE Y. R&apos;equi`eme

A first CCD 512\Theta512 camera working in scan mode (declination field 14 arcmin) has been tested during 9 months on the Bordeaux automatic meridian circle, then mounted on the Sao Paulo meridian instrument. A second improved camera, with a larger field (28 arcmin), was installed at Bordeaux in June 1996. Using as reference final positions of the Tycho stars provided by the Tycho Consortium for 16 test fields, and the corresponding Starnet proper motions obtained by S. Roser (ARI, Heidelberg), the accuracy of the positions obtained with both Bordeaux and Sao Paulo cameras was found to be about 0.05 arcsec for a star measured at least four times in the range 9--15 mag. The Bordeaux and Sao Paulo instruments are currently used for observations of selected fields (around quasars, open clusters, Solar System objects). As a long-term programme, Bordeaux is starting CCD observations of the Bordeaux Astrographic Catalogue zone (+11 ffi to +17 ffi ) and the measurement of the old Bordeaux..

A 4 Gsample/s 2 bits flash ADC with 2–4 GHz input bandwidth for radio astronomy application

This paper presents the design and the measurement results of a high speed A/D converter (ADC or digitizer) developed for radio-astronomy applications and especially for the ALMA (Atacama Large Millimeter Array) project. This monolithic digitizer is implemented in a BiCMOS0.35 μmSiGe process for high frequencymixed-signal applications. The main characteristics of this circuit are a 2 bits resolution with 3 quantization levels (equivalent to 1.5 bits) with 4 Gsample/s rate, a wide input bandwidth from 2 GHz up to 4 GHz under full Nyquist condition. The adopted digitizer architecture is that of a conventional flash analog to digital converter structure. The overall chip dissipates 652 mW under ±1.25 V supply and the die area is 5.4 mm2

OBSERVATIONS DES PLANÈTES, SATELLITES ET ASTÉROÏDES AVEC LA LUNETTE MÉRIDIENNE DE L'OBSERVATOIRE DE BORDEAUX (1995-2007)

NOTES SCIENTIFIQUES ET TECHNIQUES DE L'INSTITUT DE MÉCANIQUE CÉLESTE ISBN : 2-910015-53-0Nous présentons dans cette Note Scientifique et Technique les résultats des observations astrométriques d'objets du système solaire effectuées de 1995 à 2007 avec la lunette méridienne CCD automatique de l'Observatoire de Bordeaux. Sur cette période, nous avons effectué près de 900 observations de planètes et satellites et plus de 1600 observations d'astéroïdes. Une analyse des observations des planètes et des satellites par Arlot et al. (2008) a montré leur utilité pour l'étude des éphémérides de ces corps

Observations des planètes, satellites et astéroïdes avec la lunette méridienne de l'observatoire de Bordeaux

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Minor Planet Observations [999 Floirac]

2008MPC..63592..11V - Minor Planet Observations [999 Floirac] edited in Minor Planet Circular 63592, 11 (2008

The Bordeaux and Valinhos CCD meridian circles

A first CCD $512\times 512$ 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 $1024\times 1024$ 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 $9\leq V\leq 14$. 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 Hipparcos- Tycho 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