Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Determining PPN gamma with Gaia's astrometric core solution

In English

Författare

Summary, in English

The ESA space astrometry mission Gala, due for launch in early 2012, will in addition to its huge output of fundamental astrometric and astrophysical data also provide stringent tests of general relativity. In this paper we present an updated analysis of Gaia's capacity to measure the PPN parameter gamma as part of its core astrometric solution. The analysis is based on small-scale astrometric solutions taking into account the simultaneous determination of stellar astrometric parameters and the satellite attitude. In particular, the statistical correlation between PPN gamma and the stellar parallaxes is considered. Extrapolating the results to a full-scale solution using some 100 million stars, we find that PPN gamma could be obtained to about 10(-6), which is significantly better than today's best estimate from the Cassini mission of 2 x 10(-5).

Publiceringsår

2010

Språk

Engelska

Sidor

315-319

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

  • data analysis
  • gravitation
  • Astrometry
  • relativity

Conference name

261st Symposium of the International-Astronomical-Union

Conference date

2009-04-27 - 2009-05-01

Status

Published

ISBN/ISSN/Övrigt

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