Computer Science – Performance
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993alab.reptu....w&link_type=abstract
Final Technical Report, 24 Feb. - 30 Apr. 1993 Alabama Univ., Huntsville. Research Inst.
Computer Science
Performance
Astro Missions (Sts), Exhaust Gases, Spaceborne Telescopes, Spacecraft Contamination, Ultraviolet Telescopes, Contaminants, Contamination, Plumes, Transmission Loss
Scientific paper
The Astro-2 mission scheduled for Jan. 1995 flight is co-manifested with the Spartan experiment. The Astro instrument array consists of several telescopes operating in the UV spectrum. To obtain the desired 300 observations with the telescope array in a shorter time than the Astro-1 mission, it will be necessary to use the primary reaction control system (PRCS) rather than just the Vernier reaction control system. The high mass flow rate of the PRCS engines cause considerable concern about contamination due to PRCS plume return flux. Performance of these instruments depends heavily on the environment they encounter. The ability of the optical system to detect a remote signal depends not only on the intensity of the incoming signal, but also on the ensuing transmission loss through the optical train of the instrument. Performance of these instruments is thus dependent on the properties of the optical surface and the medium through which it propagates. The on-orbit contamination environment will have a strong influence on the performance of these instruments. The finding of a two-month study of the molecular contamination environment of the Astro-2 instruments due to PRCS thruster plumes during the planned Astro-2 mission are summarized.
Greene Cindy
Wang Francis C.
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