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Spatial correlations in the Gaia astrometric solution

In English

Författare

Summary, in English

Accurate characterization of the astrometric errors in the forthcoming Gaia catalogue is essential for making optimal use of the data. Using small-scale numerical simulations of the astrometric solution, we investigate the expected spatial correlation between the astrometric errors of stars as function of their angular separation. Extrapolating to the full-scale solution for the final Gala catalogue, we find that the expected correlations are generally very small, but could reach some fraction of a percent for angular separations smaller than about one degree. The spatial correlation length is related to the size of the field of view of Gala., while the maximum correlation coefficient is related to the mean number of stars present in the field at any time. Our scalable simulation tool (AGISLab) makes it possible to characterize the astrometric errors and correlations, e.g., as functions of position and magnitude.

Publiceringsår

2010

Språk

Engelska

Sidor

320-324

Publikation/Tidskrift/Serie

Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis (IAU Symposium)

Volym

261

Dokumenttyp

Konferensbidrag

Förlag

Cambridge University Press

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • space vehicles
  • methods: statistical
  • methods: data analysis
  • catalogs
  • Astrometry
  • reference systems

Conference name

261st Symposium of the International-Astronomical-Union

Conference date

2009-04-27 - 2009-05-01

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1743-9221
  • ISSN: 1743-9213