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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2017
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57153211012 |
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Table of Contents:
- THE ASTROMETRIC LESSONS OF GAIA-GBOT EXPERIMENT S. Bouquillon R. A. Mendez M. Altmann Física, Astronomía y Matemáticas ISM pre stars mass loss H II regions To ensure the full capabilities of the Gaia’s measurements, a programme of daily observations with Earth-based telescopes of the satellite itself - called Ground Based Optical Tracking (GBOT) - was implemented since the beginning of the Gaia mission (for more details concerning G BOT operating see Altmann et al. 2014 and concerning GBOT software facilities see Bouquillon et al. 2 014). These observations are carried out mainly with two facilities: the 2.6m VLT Survey Telescope (ESO’s VS T) at the Cerro Paranal in Chile and the 2.0m Liverpool Telescope (LT) on the Canary Island of La Palm a. The constraint of 20 mas on the tracking astrometric quality and the fact that Gaia is a faint and rela tively fast moving target (its magnitude in a red passband is around 21 and its apparent speed around 0.04”/s) , lead us to rigorously analyse the reachable astrometric precision for CCD observations of this kind of c elestial objects. During LARIM 2016, we presented the main results of this study which uses the Cram ́er-Rao low er bound to characterize the precision limit for the PSF center when drifting in the CCD-frame. This work extends earlier studies dealing with one-dimensional detectors and stationary sources (Mendez et al. 2013 & 2014) firstly to the case of standard two-dimensional CCD sensors, and then, to moving sources. These new results h ave been submitted for a publication in A&A journal this year (Bouquillon et al. 2017). 2017 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57153211012 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.49