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2013 BS45
(also written 2013 BS45) is a horseshoe companion to the Earth like 3753 Cruithne. Like Cruithne, it does not orbit the Earth and at times it is on the other side of the Sun.
== Discovery, orbit and physical properties ==
was discovered by James V. Scotti on January 20, 2013 observing for the Spacewatch project from Kitt Peak (KPNO).〔(Discovery MPEC )〕〔 Its orbit is characterized by low eccentricity (0.084), low inclination (0.77º) and a semi-major axis of 0.993 AU;〔 it is the most Earth-like among those of asteroids moving in Earth-like orbits.〔 Upon discovery, it was classified as an Aten asteroid but also an Earth crosser by the Minor Planet Center. Its orbit is well determined; as of August 26, 2015 its orbit is based on 96 observations spanning a data-arc of 375 days.〔 has an absolute magnitude of 25.9 which gives a characteristic diameter of 30 m.〔 Radar observations indicate that it may be a very rapid rotator with a period of just a few minutes.
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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