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2011 MD was observed by the Spitzer Space Telescope in February 2014 and estimated to be 6 meters (20 ft) in diameter. [4] The asteroid is a porous rubble pile with a density similar to water. [4] On 19 June 2014, NASA reported that asteroid 2011 MD was a prime candidate for capture by the Asteroid Redirect Mission (ARM) in the early 2020s. [10]
Co-orbital near-Earth asteroid; sample return target [27] 1998 KY 26: 0.030: 1998: Hayabusa2# 2031: Near-Earth asteroid of the Apollo group; extended mission target [24] 2015 XF 261: 0.03: 2015: Unnamed CNSA mission: 2029: Near-Earth asteroid of the Aten group, will be visited by an orbiter and impactor for an asteroid deflection test. [28 ...
June 27, 1949: First Mercury crosser discovered 1902 Shaposhnikov: 97: April 18, 1972: Last ~100+ km in diameter asteroid discovered 2309 Mr. Spock: 21.3: August 16, 1971: First asteroid named after cat 3200 Phaethon: 5: October 11, 1983: First asteroid discovered from space; source of Geminids meteor shower. 3753 Cruithne: 5: October 10, 1986 ...
More than one asteroid per year may be listed if its geocentric distance [note 1] is within a tenth of the lunar distance, or 0.10 LD. For comparison, since a satellite in a geostationary orbit has an altitude of about 36,000 km (22,000 mi), then its geocentric distance is 0.11 LD (approximately three times the width of the Earth).
A list of known near-Earth asteroid close approaches less than 1 lunar distance (384,400 km or 0.00257 AU) from Earth in 2011. [note 1] Rows highlighted red indicate objects which were not discovered until after closest approach
There have been thirty-three overall missions towards minor planets, with four of them being flyby missions that were not intended to explore minor planets, marked in grey background. [1] [2] Many minor planets are in two domains: Asteroid belt, between 2–3 AU (0.30–0.45 billion km) Kuiper belt, between 30–60 AU (4.5–9.0 billion km)
A massive asteroid, spanning more than two miles across, has just made its closest approach to Earth in decades - but its spectacle isn’t over yet.. The asteroid, named (887) Alinda, will reach ...
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...