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Applications Technology Satellite 3, or ATS-3, was a long-lived American experimental geostationary weather and communications satellite, operated by NASA from 1967 to 2001. It was at one time reputed to be the oldest satellite still in operation;〔(【引用サイトリンク】title=Technology )〕 , NASA referred to the ATS-3 as "The oldest active communications satellite by a wide margin." ==History== Launched in November 1967, the ATS-3 was in service for 11 years before finally being decommissioned in 1978 along with ATS-1. Among its widest-known achievements are the first full-disk, color Earth images transmitted from a satellite. Its imaging capability has served during disaster situations, from the Mexico earthquake to the Mount St. Helens eruption.〔 ATS-3 experiments included VHF and C-band communications, a color spin-scan camera〔(【引用サイトリンク】title=NASA - NSSDC - Experiment - Details - Multicolor Spin-Scan Cloudcover Camera (MSSCC) )〕 (principally developed by Verner E. Suomi), an image dissector camera, a mechanically despun antenna, resistojet thrusters, hydrazine propulsion, optical surface experiments, and the measurement of the electron content of the ionosphere and magnetosphere. Because of failures in the hydrogen peroxide systems on ATS-1, ATS-3 was equipped with a hydrazine propulsion system. Its success led to its incorporation on ATS-4 and ATS-5 as the sole propulsion system.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ATS-3」の詳細全文を読む スポンサード リンク
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