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David Hobbs. Photo.

David Hobbs

Professor

David Hobbs. Photo.

Implementation of the Global Parameters Determination in Gaia's Astrometric Solution (AGIS)

Author

  • F. Raison
  • A. Olias
  • David Hobbs
  • Lennart Lindegren

Editor

  • Yoshihiko Mizumoto
  • Koh-Ichiro Morita
  • Masatoshi Ohishi

Summary, in English

Gaia is ESA’s space astrometry mission with a foreseen launch date in early 2012. Its main objective is to perform a stellar census of the 1000 Million brightest objects in our galaxy (completeness to V=20 mag) from which an astrometric catalog of micro-arcsec level accuracy will be constructed. A key element in this endeavor is the Astrometric Global Iterative Solution (AGIS). A core part of AGIS is to determine the accurate spacecraft attitude, geometric instrument calibration and astrometric model parameters for a well-behaved subset of all the objects (the ‘primary stars’). In addition, a small number of global parameters will be estimated, one of these being PPN γ. We present here the implementation of the algorithms dedicated to the determination of the global parameters.

Department/s

  • Lund Observatory - Has been reorganised

Publishing year

2010

Language

English

Pages

386-389

Publication/Series

Astronomical Society of the Pacific Conference Series

Volume

434

Document type

Conference paper

Publisher

Astronomical Society of the Pacific (ASP)

Topic

  • Astronomy, Astrophysics and Cosmology

Conference name

Astronomical Data Analysis Software and Systems XIX

Conference date

2009-10-04

Conference place

Sapporo, Japan

Status

Published

ISBN/ISSN/Other

  • ISBN: 978-1-58381-748-3