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design of a day/night star camera systemThis paper describes the design of a camera system capable of acquiring stars during both the day and night cycles of a high altitude balloon flight (35-42 km). The camera system will be filtered to operate in the R band (590-810 nm). Simulations have been run using MODTRAN atmospheric code to determine the worse case sky brightness at 35 km. With a daytime sky brightness of 2(exp -05) W/sq cm/str/um in the R band, the sensitivity of the camera system will allow acquisition of at least 1-2 stars/sq degree at star magnitude limits of 8.25-9.00. The system will have an F2.8, 64.3 mm diameter lens and a 1340X1037 CCD array digitized to 12 bits. The CCD array is comprised of 6.8 X 6.8 micron pixels with a well depth of 45,000 electrons and a quantum efficiency of 0.525 at 700 nm. The camera's field of view will be 6.33 sq degree and provide attitude knowledge to 8 arcsec or better. A test flight of the system is scheduled for fall 1999.
Document ID
19990103105
Document Type
Reprint (Version printed in journal)
Authors
Alexander, Cheryl
(NASA Marshall Space Flight Center Huntsville, AL United States)
Swift, Wesley
(Alabama Univ. Huntsville, AL United States)
Ghosh, Kajal
(NASA Marshall Space Flight Center Huntsville, AL United States)
Ramsey, Brian
(NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Instrumentation and Photography
Meeting Information
Optical Sciences, Engineering...(Denver, CO)
Distribution Limits
Public
Copyright
Other