Small Astronomy Satellite 2
United States
The Small Astronomy Satellite 2, also known also as SAS-2, SAS B or Explorer 48, was a NASA gamma ray telescope. It was launched on 15 November 1972 into the low Earth orbit with a periapsis of 443 km and an apoapsis of 632 km. It completed its observations on 8 June 1973.
Observatory data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).