BLAST Autonomous Daytime Star Cameras

Details BLAST Autonomous Daytime Star Cameras BLAST Autonomous Daytime Star Cameras

2006-05-01

arxiv.org/abs/astro-ph/0605039v1

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures, 1 table. To be published in conference proceedings for the "Ground-based and Airborne Instrumentation for

Scientific paper

10.1117/12.671965

We have developed two redundant daytime star cameras to provide the fine pointing solution for the balloon-borne submillimeter telescope, BLAST. The cameras are capable of providing a reconstructed pointing solution with an absolute accuracy < 5 arcseconds. They are sensitive to stars down to magnitudes ~ 9 in daytime float conditions. Each camera combines a 1 megapixel CCD with a 200 mm f/2 lens to image a 2 degree x 2.5 degree field of the sky. The instruments are autonomous. An internal computer controls the temperature, adjusts the focus, and determines a real-time pointing solution at 1 Hz. The mechanical details and flight performance of these instruments are presented.

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