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Proceedings Paper

COROT--high precision stellar photometry on a low Earth orbit: solutions to minimize environmental perturbations
Author(s): Michel Auvergne; Laurent Boisnard; Jean-Tristan M. Buey; Gerard Epstein; Herve Hustaix; Martine Jouret; Patrick Levacher; Stephane Berrivin; Annie Baglin
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Paper Abstract

The COROT small satellite project is a space mission dedicated to stellar seismology and search for telluric extra-solar planets. For the two programs a very high photometric precision is needed. The COROT seismology program will measure periodic variations with amplitude of 2.10-6 of the photon flux emitted by bright stars. COROT will also be able to detect the presence of exoplanets when they pass between the satellite and their parent star. Modifying both the integration time and the focus conditions, it allows to detect photons flux variations about 7.10-4 in one hour integration, compatible with an occultation detection on a very large number of stars (magnitude between 12 and 15.5). Between 10 and 40 telluric planets in the "habitable zone" and several hundreds of hot Jupiters should be detected depending on hypotheses about planets existence. To reach the required performances a stringent instrument stability is necessary. The satellite Preliminary Design Review will be held in November 2002 while the instrument is already in development phase for a delivery of the flight model in 2004. The launch is scheduled late 2005, by the first SOYUZ launcher to fly from the Guyana Space Center. The project activities are currently focused on the instrument and system engineering. Straylight rejection, pointing, thermal stability are the main critical points of the mission, on a LEO at 826 kms, for which cost-effective compromises have been found to 1mit their effects. This paper recalls the scientific program s, the main characteristics of the mission, describes the impact of the three main perturbators on the photometric precision and the technical solutions which reduce their contribution at an acceptable level.

Paper Details

Date Published: 24 February 2003
PDF: 11 pages
Proc. SPIE 4854, Future EUV/UV and Visible Space Astrophysics Missions and Instrumentation, (24 February 2003); doi: 10.1117/12.459806
Show Author Affiliations
Michel Auvergne, Observatoire de Paris-Meudon (France)
Laurent Boisnard, Ctr. Nationale d'Etudes Spatiales (France)
Jean-Tristan M. Buey, Ctr. National d'Etudes Spatiales (France)
Gerard Epstein, Observatoire de Paris-Meudon (France)
Herve Hustaix, Ctr. Nationale d'Etudes Spatiales (United States)
Martine Jouret, Ctr. Nationale d'Etudes Spatiales (France)
Patrick Levacher, Lab. d'Astrosphysique de Marseille (France)
Stephane Berrivin, Ctr. Nationale d'Etudes Spatiales (United States)
Annie Baglin, Observatoire de Paris-Meudon (France)


Published in SPIE Proceedings Vol. 4854:
Future EUV/UV and Visible Space Astrophysics Missions and Instrumentation
J. Chris Blades; Oswald H. W. Siegmund, Editor(s)

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