Space astrometry missions
Eas Publications Series(2020)
摘要
The successful hipparcos mission
has brought, and proved the validity of, a new observational
concept to achieve absolute measurements of star positions in
space. Only five years after the final publication of the results
there are now four astrometry missions scheduled for the next
decade, three of which appearing as the natural heirs of this
pioneering mission. Space astrometry missions share a certain
number of common features imposed by their observational
principles and their scientific goals. The first part of this
paper attempts to show how the objectives put severe constraints
on the design and that this can be investigated with a fairly
general approach. The German mission diva is then detailed as an
illustration ( gaia being considered elsewhere in this volume).
In the last section few words are added about fame and sim followed by global comparisons of these missions and their
scientific returns.
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关键词
space
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