HST Astrometry Changes Post-SM3A

Details HST Astrometry Changes Post-SM3A HST Astrometry Changes Post-SM3A

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.8501b&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #85.01; Bulletin of the American Astronomical Society, Vol. 31, p.1499

Astronomy and Astrophysics

Astronomy

Scientific paper

HST Astrometry is presently conducted with Fine Guidance Sensor #1, having recently transitioned from Fine Guidance Sensor #3. During the Shuttle Servicing Mission SM3A the flight computer which controls the Astrometer will be replaced. Commanding changes were necessitated to transition from a fixed-point assembly language architecture to a floating-point C language. This paper describes the validation process of the commands and the controlling algorithms; a description of the test setup to conduct end-to-end testing with the hardware; an enhancement to the Astrometry TRANS mode to remove the Coarse Track/Fine Lock transition error; addition of an Astrometry MAP mode to facilitate tying the Star Tracker reference frame and the Fine Guidance reference frame to the spacecraft.

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