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2011 EO40
, also written 2011 EO40, is an Apollo asteroid and a possible candidate for the parent body of the Chelyabinsk superbolide.
==Discovery, orbit and physical properties==
was discovered by Richard A. Kowalski on March 10, 2011 while observing for the Mount Lemmon Survey.〔(Discovery MPEC )〕〔
Its orbit is typical of Apollo asteroids and is characterized by significant eccentricity (0.54), low inclination (3.36º), and a semi-major axis of 1.65 AU.〔(MPC data on 2011 EO40 )〕 Upon discovery, it was classified as an Earth crosser, a near-Earth asteroid (NEA) and a potentially hazardous asteroid (PHA) by the Minor Planet Center. It was listed on the Sentry Risk Table for less than one day.〔 Its orbit is in need of additional observations to determine if it is part of an asteroid family; as of October 2015 the orbit is determined using just twenty observations spanning an observation arc of 34 days.〔 has an absolute magnitude of 21.5,〔 which gives a characteristic diameter of about .〔
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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