The in-flight performance of the Zebra day-time star sensor

Details The in-flight performance of the Zebra day-time star sensor The in-flight performance of the Zebra day-time star sensor

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..159r&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 2, p. 159-163.

Physics

Balloon-Borne Instruments, Ccd Star Tracker, Gamma Ray Telescopes, Stabilized Platforms, Angular Resolution, Imaging Techniques, Point Sources, Pointing Control Systems, Three Axis Stabilization

Scientific paper

The low energy balloon-borne gamma-ray telescope Zebra is capable of producing images of the sky with a resolution of 1 deg and a point-source location accuracy of a few arcminutes. In order to fully exploit the sensitivity of this instrument, a platform stabilized in three axes to this precision was developed, which however has an absolute pointing accuracy of 30 min-1 deg. Therefore there is a need to have on board a system which allows post facto reconstruction of the absolute pointing direction of the telescope as a function of time for observations in both day- and night-time conditions. An independently steerable starsensor was constructed, based on a CCD imaging system, for this purpose. The results obtained with this device during the first flight of the Zebra telescope in May 1989 from a NASA balloon base are presented.

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