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Small Astronomy Satellite 2
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<p>The Small Astronomy Satellite 2, also known also as SAS-2, SAS B or Explorer 48, was a <a href="/facts/NASA/TIMCV0yV">NASA</a> <a href="/facts/Gamma_ray_telescope/s59YdwaX">gamma ray telescope</a>. It was launched on 15 November 1972 into the <a href="/facts/Low_Earth_orbit/rq1TwayJ">low Earth orbit</a> with a <a href="/facts/Periapsis/VaL6ow9w">periapsis</a> of 443 km and an <a href="/facts/Apoapsis/VaL6ow9w">apoapsis</a> of 632 km. It completed its observations on 8 June 1973. </p>