SIGMA - A high angular resolution gamma ray space observatory program

Details SIGMA - A high angular resolution gamma ray space observatory program SIGMA - A high angular resolution gamma ray space observatory program

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pari.iafcr....r&link_type=abstract

International Astronautical Federation, International Astronautical Congress, 33rd, Paris, France, Sept. 27-Oct. 2, 1982, 9 p.

Astronomy and Astrophysics

Astronomy

Astronomical Observatories, Gamma Ray Astronomy, Spaceborne Astronomy, Angular Resolution, Ariane Launch Vehicle, Coding, Computerized Simulation, Electromagnetic Shielding, Spaceborne Telescopes, Spacecraft Electronic Equipment

Scientific paper

Design features and performance specifications of the SIGMA space observatory for detecting stellar sources of high energy (30 keV-2 MeV) gamma ray events are described. The system is proposed for launch on board the Ariane 4 vehicle in 1985 into a quasi-equatorial orbit of 185/35,000 km with a 7 deg inclination. The instrument is intended to cover 10-100 arcmin with a sensitivity of 1/100,000 photons/sq cm, per second, per keV, with 24 hr scans. The total field is projected as being 7 x 7 deg. The principle of a coded aperture mask telescope is used, with a screen code of 82 x 86 elements. The arrangement follows patterns defined by the method of twin prime numbers generating pseudo-random sequences. Position coding takes place with an Anger camera. The payload total will be 800 kg, will have a sun pointing system, solar panels, and will possess on-board storage capability for data transmission to earth at a 2 kbit/sec rate.

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