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2005 NB56
, also written as 2005 NB56, is a near-Earth object.〔(【引用サイトリンク】title=JPL Small-Body Database Browser: (2005 NB56) )〕 This small body has been suggested as a possible source of the Tunguska event on June 30, 1908.〔(When Comets Attack: Solving the Mystery of the Biggest Natural Explosion in Modern History ), By Mark Anderson, Popular Mechanics〕
==Controversial study==
One study "suggests that a chunk of a comet caused the 5-10 megaton fireball, bouncing off the atmosphere and back into orbit around the sun."〔
This object made a close approach to Earth when it was discovered in 2005 and will do so again in 2045.〔(【引用サイトリンク】publisher=Department of Mathematics, University of Pisa, ITALY )〕 This object has a poorly known orbit and was only observed over an observation arc of 17 days, not sufficient to predict its position in 1908 with sufficient accuracy.〔
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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