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Determining PPN gamma with Gaia's astrometric core solution

Hobbs, David LU ; Holl, Berry LU ; Lindegren, Lennart LU ; Raison, Frederic; Klioner, Sergei and Butkevich, Alexey (2010) 261st Symposium of the International-Astronomical-Union In Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis (IAU Symposium) 261. p.315-319
Abstract
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... (More)
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). (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
data analysis, gravitation, Astrometry, relativity
in
Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis (IAU Symposium)
volume
261
pages
315 - 319
publisher
Cambridge University Press
conference name
261st Symposium of the International-Astronomical-Union
external identifiers
  • wos:000280569700050
  • scopus:84864434714
ISSN
1743-9221
1743-9213
DOI
10.1017/S1743921309990561
language
English
LU publication?
yes
id
c9c388ef-d6ce-4c09-9a20-96e35462216f (old id 1678383)
date added to LUP
2010-09-21 09:36:06
date last changed
2018-05-29 11:26:15
@inproceedings{c9c388ef-d6ce-4c09-9a20-96e35462216f,
  abstract     = {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).},
  author       = {Hobbs, David and Holl, Berry and Lindegren, Lennart and Raison, Frederic and Klioner, Sergei and Butkevich, Alexey},
  booktitle    = {Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis (IAU Symposium)},
  issn         = {1743-9221},
  keyword      = {data analysis,gravitation,Astrometry,relativity},
  language     = {eng},
  pages        = {315--319},
  publisher    = {Cambridge University Press},
  title        = {Determining PPN gamma with Gaia's astrometric core solution},
  url          = {http://dx.doi.org/10.1017/S1743921309990561},
  volume       = {261},
  year         = {2010},
}