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1991 VG
1991 VG is a Near-Earth object discovered by American astronomer James Scotti on 6 November 1991.
== Earth-like orbit ==
On November 6, 1991, Scotti discovered a faint object which was designated 1991 VG soon after discovery.〔(satobs.org: James Scotti, ''Re: What is 1991 VG?'' )〕 The object's heliocentric orbit was found to be very similar to Earth's orbit〔(jpl.nasa.gov, ''1991 VG Earth Impact Risk Summary'' )〕 and it was found that it would make a close approach to Earth just a month after discovery (on December 5, 1991〔). Given such an Earth-like orbit, the dynamical lifetime of such an object is relatively short with the object quickly either impacting Earth or being perturbed by Earth onto a different orbit. The similarity of its orbit with Earth was also very difficult to explain from natural sources, with ejecta from a recent Lunar impact or non-gravitational perturbations such as the Yarkovsky effect having been suggested. More recently, the first Earth Trojan asteroid - 2010 TK7 has been identified and such objects could well be a source for objects like 1991 VG.
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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