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Intelsat III F-3 was a geostationary communications satellite operated by Intelsat. Launched in 1969 it was intended for operations over the Pacific Ocean; however, it spent most of its service life over the Indian Ocean at a longitude of 63 degrees east. The third of eight Intelsat III satellites to be launched, Intelsat III F-3 was built by TRW. It was a spacecraft, with its mass reducing to by entry into service as it burned propellant to reach its final orbit. The satellite carried an SVM-2 apogee motor for propulsion and was equipped with two transponders powered by body-mounted solar cells generating 183 watts of power. It was designed for 5 years of service life. The launch of Intelsat III F-3 made use of a Delta M rocket flying from Launch Complex 17A at the Cape Canaveral Air Force Station. The launch, which was conducted by NASA, took place at 00:39:00 UTC on February 6, 1969, with the spacecraft entering a geosynchronous transfer orbit.〔 Shortly after launch, Intelsat III F-3 fired its apogee motor to achieve geostationary orbit. Intended to be operated over the Pacific Ocean at a longitude of 174° east, Intelsat III F-3 was moved to the less important Indian Ocean slot at 63° east after only three months in orbit due to concerns regarding its reliability.〔 The satellite was only regarded as partially operable; however, it remained in service until April 1979, before being decommissioned in December of that year. At the end of its service life, Intelsat III F-3 was raised into a higher orbit to reduce the probability of it colliding with an operational spacecraft. As of February 3, 2014 it remains in orbit, with a perigee of , an apogee of , inclination of 18.63 degrees and an orbital period of 28.25 hours.〔 ==References== 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「Intelsat III F-3」の詳細全文を読む スポンサード リンク
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