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STS-38 / PAM-D | launch_site = Kennedy LC-39A | launch_contractor = | disposal_type = | deactivated = | last_contact = | decay_date = | orbit_epoch = | orbit_reference = Geocentric | orbit_regime = Near-geosynchronous | orbit_periapsis = | orbit_apoapsis = | orbit_inclination = | orbit_period = | apsis = gee }} Prowler was an American reconnaissance satellite launched aboard in 1990 in order to study Soviet satellites in geosynchronous orbit. The government of the United States has never acknowledged its existence, however it has been identified by amateur observers and through leaked information. ==Spacecraft== Prowler was based on the HS-376 satellite bus, developed by Hughes. It had a mass of around and carried modifications to reduce its visibility to ground-based observers and to radar. Following the satellite's retirement these modifications ceased to be effective, allowing it to be found by amateur observers.〔 Prowler was designed to manoeuvre to within a few metres of satellites in geosynchronous orbit. Its purpose was either to monitor them and return data about them, or to perform a signals intelligence mission such as intercepting communications between those satellites and the ground.〔 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「Prowler (satellite)」の詳細全文を読む スポンサード リンク
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