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2011 SC191
, also written as 2011 SC191, is a small asteroid orbiting near the of Mars (60 degrees behind Mars on its orbit).〔
==Discovery, orbit and physical properties==
was first observed on March 21, 2003 by the Near-Earth Asteroid Tracking (NEAT) project at Palomar Observatory using the Samuel Oschin telescope and given the provisional designation . The object was subsequently lost and re-discovered on October 31, 2011 by the Mt. Lemmon Survey.〔(Discovery MPEC )〕〔
Its orbit is characterized by low eccentricity (0.044), moderate inclination (18.7°) and a semi-major axis of 1.52 AU.〔(MPC data on 2011 SC191 )〕 Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. Its orbit is well determined as it is currently (March 2013) based on 45 observations with a data-arc span of 3,146 days.〔(JPL's Solar System Dynamics data on 2011 SC191 )〕 has an absolute magnitude of 19.3 which gives a characteristic diameter of 600 m.〔
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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