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2014 LY21
(also written 2014 LY21) is a near-Earth asteroid roughly in diameter that passed less than from Earth around 3 June 2014 22:38 UT ± 14 hours.〔 The asteroid was discovered on 2 June 2014 by the Mount Lemmon Survey at an apparent magnitude of 21 using a reflecting telescope.〔
With an observation arc of about 1 hour, the trajectory is poorly constrained and the asteroid has an uncertainty parameter of 9 making long-term predictions of the asteroids position nearly impossible. The nominal (best fit) orbit shows that passed 〔 from Earth on 3 June 2014 (~11,600 km from Earth's surface).〔 But the uncertainty region shows that the asteroid could have approached Earth as close as or as far as .〔 Since Earth has a radius of approximately 6,400 km, the asteroid did not come any closer than about 2,600 km from Earth's surface.
The nominal orbit shows that passed from the Moon on 4 June 2014.〔 But the uncertainty region shows that the asteroid could have impacted the Moon or passed as far as .〔 But it is very unlikely that the asteroid impacted the Moon.
== References ==
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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