Autonomous target acquisition for the Space Telescope Imaging Spectrograph

Details Autonomous target acquisition for the Space Telescope Imaging Spectrograph Autonomous target acquisition for the Space Telescope Imaging Spectrograph

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3356..369b&link_type=abstract

Proc. SPIE Vol. 3356, p. 369-376, Space Telescopes and Instruments V, Pierre Y. Bely; James B. Breckinridge; Eds.

Astronomy and Astrophysics

Astronomy

Scientific paper

The Space Telescope Imaging Spectrograph (STIS), which was successfully installed into the Hubble Space Telescope (HST) in February 1997, has the capability to perform a powerful set of autonomous target acquisition functions. The STIS target acquisition capabilities have been tested during the initial commissioning of the instrument and are currently being used to acquire astronomical targets to support the HST Guest Observer program and the ongoing instrument calibration activities. STIS can perform several types of autonomous target acquisition sequences, all of which make use of the STIS instrument's imaging capabilities and are controlled by flight software executing out of the STIS control section microprocessor, an Intel 80386. The types of acquisitions include the location of point sources, the location of the brightest area in a diffuse or extended target, the location of point sources in crowded fields, and the centering of targets within any of the STIS spectroscopic slits. In order to move located targets into slits and center them there, the STIS control section flight software makes requests for HST pointing corrections, via special engineering telemetry sent to the HST main flight computer. The accuracy of the target acquisition tested in orbit has exceeded pre-flight specifications.

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