Global Astrometry with the Space Interferometry Mission

Details Global Astrometry with the Space Interferometry Mission Global Astrometry with the Space Interferometry Mission

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..789b&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 789-794

Computer Science

Performance

10

Scientific paper

In this paper we will discuss the prospects for global astrometric measurements with the Space Interferometry Mission (SIM). SIM will perform four microarcsec astrometric measurements on objects as dim as 20th magnitude using optical interferometric techniques with a 10 m baseline. SIM performs both narrow-angle astrometry and global astrometry by means of an astrometric grid. We will report on sensitivities of SIM global astrometric performance and grid accuracy versus instrumental parameters and sky coverage schemes. The problems in finding suitable astrometric grid objects to support microarcsec astrometry, and ground-based observing programs that address these issues will be discussed.

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