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(311999) 2007 NS2 : ウィキペディア英語版 | (311999) 2007 NS2
is an asteroid orbiting near the of Mars. ==Discovery, orbit and physical properties== was discovered on July 14, 2007, by the Observatorio Astronómico de La Sagra.〔(2007 NS2 discovery blog )〕〔(Discovery MPEC )〕〔(Update MPEC )〕〔(New Scientist article on the discovery )〕〔 Its orbit is characterized by low eccentricity (0.054), moderate inclination (18.6°) and a semi-major axis of 1.52 AU.〔(MPC data on 2007 NS2 )〕 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 87 observations with a data-arc span of 4,800 days.〔(JPL's Solar System Dynamics data on 2007 NS2 )〕 has an absolute magnitude of 17.8, which gives a characteristic diameter of 870 m.〔
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