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2001 GO2
is a small asteroid that is a near-Earth object, an Earth coorbital,〔(【引用サイトリンク】url=http://science.nasa.gov/science-news/science-at-nasa/2006/09jun_moonlets/ )〕 and an Apollo asteroid.
==Orbit==
With an orbital period of 368.95 days, is in a near 1:1 orbital resonance with Earth, and also has about the same orbit around the Sun as Earth.〔 Unlike most near-Earth asteroids that simply fly by when they approach Earth, the Earth catches up with this asteroid from behind so that the asteroid then pauses in the vicinity of Earth. While in the vicinity of Earth, the asteroid moves in a helical (corkscrew) pattern that resembles an orbit around the Earth, like the Earth has a new moon. But it is not really a moon, because the asteroid is not gravitationally bound to the Earth, and eventually the asteroid moves on away from Earth and continues its orbit around the Sun. was in this helical pattern from about 1997 to 2005, making the closest approach to Earth on 6 April 2001, and will not make another close approach until 2092.
The asteroid probably has a horseshoe orbit, but this has not been proven because the orbit was determined from only 5 days worth of observation. The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 6.033.〔
Other asteroids that move in this helical pattern, some of which the Earth catches up with the asteroid, and others in which the asteroid catches up with Earth, are , , and .〔
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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