The flight hardware and ground system for Hubble Space Telescope astrometry

Details The flight hardware and ground system for Hubble Space Telescope astrometry The flight hardware and ground system for Hubble Space Telescope astrometry

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..317b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, March 1991, p. 317-335.

Physics

Optics

40

Astrometry, Ground Support Systems, Hubble Space Telescope, Spacecraft Instruments, Cassegrain Optics, Control Theory, Mirrors, Pointing Control Systems, Spacecraft Guidance

Scientific paper

An account is presented of the Fine Guidance Sensor (FGS) which furnishes guidance and astrometry in the HST, giving attention to its interferometric design and its astrometric performance capabilities, the astrometric observing modes and software commands used in their implementation, and expected HST states with regard to line-of-sight jigger, drift, and guidance mode during a given observation. FGS operational modes discussed encompass support-system module control, search, coarse track, fine lock, line-of-sight scan, and stop. In astrometric measurements, relative positional accuracies of the order of 0.003 arcsec are achievable; precise parallaxes, detection thresholds for planetary companions of nearby stars, and kinematic characterizations of star clusters will be facilitated thereby.

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