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Proceedings Paper • Open Access

Challenges in the optical system of GAIA
Author(s): Rudolf S. Le Poole

Paper Abstract

The precision aimed at by ESA’s Astrometry and Radial Velocity mission GAIA surpasses that of the successful HIPPARCOS mission by more than 2 orders of magnitude, while at the same time increasing the number of objects 10000 times. This overwhelming increase in performance (statistical weight increased by ~ 8 orders of magnitude) is achieved by insisting on a full description in terms of photon shot noise as the fundamental limiting factor. Yet such measurements refer to wave front topography to be understood to the level of better than 100 pico meters, in an optical system a few meters across. Obviously such understanding relies heavily on the expected stability, and chromatic effects also are of dominant importance, requiring stellar spectral energy distributions to be determined. It is fascinating that the experience of HIPPARCOS can indeed generate sufficient confidence for these performance specifications to be within reach. Elaborating the design specifications and tolerances I hope to convince you of GAIA’s imminent success.

Paper Details

Date Published: 21 November 2017
PDF: 2 pages
Proc. SPIE 10566, International Conference on Space Optics — ICSO 2008, 105661R (21 November 2017); doi: 10.1117/12.2308235
Show Author Affiliations
Rudolf S. Le Poole, TNO (Netherlands)

Published in SPIE Proceedings Vol. 10566:
International Conference on Space Optics — ICSO 2008
Josiane Costeraste; Errico Armandillo; Nikos Karafolas, Editor(s)

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