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Hypothetical moon of Mercury
Mercury's moon would be an undiscovered natural satellite orbiting the planet Mercury. One was briefly thought to exist in the early 1970s, but it turned out to be misinterpreted data from a star.〔 Observation of a Mercurian moon from Earth would be difficult because Mercury is relatively close to the Sun.〔(Malcolm W. Browne - An Airborne Telescope Risks a Look At Mercury (1995) - The New York Times )〕 For example, Mercury was not observed in the infrared spectrum until 1995.〔 NASA's ''MESSENGER'' spacecraft, which orbited Mercury from 2011 to 2015, did not detect any moon.〔(A lot of moons or no moons at all? ) ''NASA''. 5 November 2015.〕
==''Mariner 10'' mission==
A moon of Mercury was for a short time thought to exist. On March 27, 1974, two days before ''Mariner 10'' made its flyby of Mercury, instruments began registering large amounts of ultraviolet radiation in the vicinity of Mercury that, according to one astronomer, "had no right to be there".〔(Mercury's Moon ). "Hypothetical Planets". Paul Schlyter. 2009.〕 By the next day, the radiation had disappeared; it reappeared three days later, appearing to originate from an object that was, seemingly, detached from Mercury.〔 Some astronomers speculated that they had detected a star, but others argued that the object must be a moon, citing not only the two different directions from which the radiation had emanated, but also the belief that such high-energy radiation could not penetrate very far through the interstellar medium.〔 Arguments in favor of a moon were strengthened when the object's speed was calculated to be , which matched the expected speed of a moon.〔
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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