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Landsat 5
Landsat 5 was a low Earth orbit satellite launched on March 1, 1984 to collect imagery of the surface of Earth. A continuation of the Landsat Program, Landsat 5 was jointly managed by the U.S. Geological Survey (USGS) and the National Aeronautics and Space Administration (NASA). Data from Landsat 5 was collected and distributed from the USGS's Center for Earth Resources Observation and Science (EROS).
After 29 years in space, Landsat 5 was officially decommissioned on June 5, 2013.〔 Near the end of its mission, Landsat 5's use was hampered by equipment failures, and it was largely superseded by Landsat 7 and Landsat 8.〔(Historic Landsat 5 Mission Ends )〕 Mission scientists anticipated the satellite will re-enter Earth's atmosphere and disintegrate around 2034.〔
Recognized by ''Guinness World Records'' as the longest-operating Earth-observing satellite mission in history, Landsat 5 orbited the planet more than 150,000 times while transmitting more than 2.5 million images of land surface conditions around the world, greatly outliving its original three-year design life.〔http://www.usgs.gov/newsroom/article.asp?ID=3626〕
==Specifications==
Landsat 5 had a maximum transmission bandwidth of 85 Mbit/s. It was deployed at an altitude of , and it took about 16 days to scan the entire Earth. The satellite was an identical copy of Landsat 4 and was originally intended as a backup. Therefore, Landsat 5 carried the same instruments, including the Thematic Mapper and Multi-Spectral Scanner. The Multi-Spectral Scanner was powered down in 1995,〔(【引用サイトリンク】title=History of Landsat 5 )〕 but reactivated again in 2012.〔(Landsat 2012 Headlines )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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