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65803 Didymos
65803 Didymos (1996 GT) is an Apollo asteroid discovered on April 11, 1996 by Joe Montani at Spacewatch at Kitt Peak. It has a moon, whence the appellation "Didymos", meaning "twin". The primary is about 800 m in diameter and the moon 150 m in diameter. The moon is in an orbit about 1.1 km from the primary and with an orbital period of 11.9 hours. Didymos is the most easily reachable asteroid its size from Earth, requiring a delta-''v'' of only 5.1 km/s〔(【引用サイトリンク】 url = http://echo.jpl.nasa.gov/~lance/delta_v/delta_v.rendezvous.html )〕 for a spacecraft to rendezvous, compared to 6.0 km/s to reach the Moon. It is the target of the proposed AIDA spacecraft, an unmanned mission that would test the possibility of changing an asteroid's orbit via impacting its surface.
== Discovery and naming ==
Didymos was discovered by Joseph L. Montani using the Spacewatch 0.9-m telescope in 1996. The binary nature of the asteroid was discovered by others; suspicions of binarity first arose in Goldstone delay-Doppler echoes, and these were confirmed with an optical light-curve analysis, along with Arecibo radar imaging on November 23, 2003. It has been informally named "Didymoon".〔"(Telescopes focus on target of ESA's asteroid mission )" at phys.org (30 June 2015)〕
Montani proposed a name to the International Astronomical Union only after the binary nature of the object was discovered: the name "Didymos" is Greek for "twin". The moon has been nicknamed "Didymoon".
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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