Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979spie..193...53f&link_type=abstract
In: Optical systems engineering; Proceedings of the Seminar, San Diego, Calif., August 27, 28, 1979. (A80-39451 16-35) Bellingha
Astronomy and Astrophysics
Astronomy
Guidance (Motion), Onboard Equipment, Optical Tracking, Pointing Control Systems, Spaceborne Telescopes, Astrometry, Design Analysis, Mirrors, Optical Paths, Optical Scanners, Space Missions, Space Shuttles
Scientific paper
The NASA Space Telescope (ST) is a 2.4-m aperture, f/24 Ritchey-Chretien telescope coupled to five on-board astronomical scientific packages. The very accurate line-of-sight stability required by ST during operating periods of up to 24 hours is maintained by the Pointing Control System whose optical system, the Fine Guidance Subsystem (FGS), is described. The Pointing Control System includes three identical FGSs, any two of which provide line-of-sight stabilization by tracking guide stars while the third performs astrometry. The optical system for the ST FGS performs the field aberration correction within the FGS near a pupil plane measuring only 52.7 mm. The design is simple and easily corrected, and offers substantial advantages over the traditional approach in terms of manufacturability.
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