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Design of a compact astrometric instrument for the GAME mission

Published online by Cambridge University Press:  01 October 2007

D. Loreggia ,
M. Gai ,
A. Vecchiato ,
D. Gardiol ,
S. Ligori  and
M. G. Lattanzi
D. Loreggia
Affiliation:
All Authors are from INAF - Astronomical Observatory of Turin, St. Osservatorio, 20, 10025 Pino Torinese, Torino, Italy. email: loreggia@oato.inaf.it
M. Gai
Affiliation:
All Authors are from INAF - Astronomical Observatory of Turin, St. Osservatorio, 20, 10025 Pino Torinese, Torino, Italy. email: loreggia@oato.inaf.it
A. Vecchiato
Affiliation:
All Authors are from INAF - Astronomical Observatory of Turin, St. Osservatorio, 20, 10025 Pino Torinese, Torino, Italy. email: loreggia@oato.inaf.it
D. Gardiol
Affiliation:
All Authors are from INAF - Astronomical Observatory of Turin, St. Osservatorio, 20, 10025 Pino Torinese, Torino, Italy. email: loreggia@oato.inaf.it
S. Ligori
Affiliation:
All Authors are from INAF - Astronomical Observatory of Turin, St. Osservatorio, 20, 10025 Pino Torinese, Torino, Italy. email: loreggia@oato.inaf.it
M. G. Lattanzi
Affiliation:
All Authors are from INAF - Astronomical Observatory of Turin, St. Osservatorio, 20, 10025 Pino Torinese, Torino, Italy. email: loreggia@oato.inaf.it
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Abstract

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We present the design of a Fizeau interferometer to be implemented for the GAME mission. The aim is to measure the PPN γ parameter with the same technique used for the first time by Dyson, Eddington et al., but at a 10−6 accuracy level. GAME will observe about 106 sufficiently bright stars at about 2° from the Sun. A dedicated space mission has the advantage of observing the light bending without waiting for an eclipse.

Keywords

gravitational lensingspace vehiclesinstrumentation: interferometerstechniques: high angular resolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 274 - 275
Copyright
Copyright © International Astronomical Union 2008

References

Loreggia, D., Gardiol, D., Gai, M., Lattanzi, M. G., & Busonero, D. 2004, Apl.Opt Vol. 53 No. 4., 721-28;Google Scholar
Vecchiato, A., Lattanzi, M. G., Gai, M., & Morbidelli, R., Gamma Astrometric Mission Experiment, Proc. IAU Symposium No. 248, in this volume, p.290Google Scholar