Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aiaa.confq....r&link_type=abstract
AIAA, Space Programs and Technologies Conference, Huntsville, AL, Mar. 24-27, 1992. 5 p.
Astronomy and Astrophysics
Astronomy
Astro Missions (Sts), Calibrating, Pointing Control Systems, Star Trackers, Stellar Magnitude, Ultraviolet Telescopes, Image Dissector Tubes, Reference Stars, Spaceborne Astronomy, Spaceborne Telescopes
Scientific paper
The Astro-1 UV astronomy mission was hampered by the failures of the automatic star acquisition procedure. The acquisition procedure depended on the Instrument Pointing Subsystem's Fixed Head Star Trackers (FHST) to acquire, track and identify guidestars of known visual magnitude. During the Astro-1 mission it was suspected that the star magnitudes measured by the FHST were much lower than predicted. A postflight investigation of the Astro-1 flight data confirmed and quantified this suspicion. Star magnitude calibration curves computed from the flight data depict the variance from the preflight calibration curves. These results are helping engineers to plan improvements to the acquisition procedure for the upcoming Astro-2 mission.
Rakoczy John M.
West Mark E.
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