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1981 Midas
1981 Midas is a near-Earth object and potentially hazardous asteroid about 3.4 kilometers in diameter.〔 It was discovered on March 6, 1973 by American astronomer Charles Kowal at Palomar Observatory in San Diego County, California.〔 In 1987 it was also detected by radar from Goldstone Deep Space Communications Complex at a distance of 0.08 AU with a measured maximal radar cross-section of 0.1 km2.〔
The moderately bright V-type asteroid is also an Apollo asteroid, as well as a Venus and Mars-crosser. The asteroid orbits the Sun at a distance of 0.6–2.9 AU every 2 years and 4 months (865 days). It takes 5.2 hours to rotate once around its axis.〔
The orbit of Midas is well-determined with a condition code of 0, the lowest possible degree of uncertainty in orbital determination. It has a low minimum orbit intersection distance with Earth of , which corresponds to 1.55 lunar distance (Earth–Moon distance). However, it does not pose an impact risk for the foreseable future. Its last notable close approach to Earth was on 11 March 1992 passing from Earth.〔 The next notable close approach will be on 21 March 2018 passing from Earth〔 and shining at an apparent magnitude of +12.4.〔
The asteroid is named after the figure from Greek mythology, Midas, the King of Phrygia, who turned whatever he touched to gold. Although he had chosen this gift as a reward for kind treatment of his captive, Silenus, he soon realized his mistake and was relieved of his power by bathing in the Pactolus River.〔
== References ==
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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