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This is a list of Solar System objects by greatest aphelion or the greatest distance from the Sun that the orbit takes it. For the purposes of this list it is implied that the object is orbiting the Sun in a two-body solution without influence of the planets or passing stars. The aphelion can change significantly due to the gravitational influence of planets and other stars. Most of these objects are comets on a calculated path and may not be directly observable.〔(JPL Small-Body Database Search Engine )〕 The maximum extent of the region in which the Sun's gravitational field is dominant, the Hill sphere), may extend to as calculated in the 1960s. But any comet currently more than about from the Sun can be considered lost to the interstellar medium. The nearest known star is Proxima Centauri at 271,000 AU which is 4.22 light years,〔(NASA - Imagine the Universe: The Nearest Star )〕 followed by Alpha Centauri at about 4.35 light years away according to NASA.〔 Comets are thought to orbit the Sun at great distances, but then be perturbed by passing stars and the galactic tides.〔(Frequently Asked Questions About General Astronomy )〕 As they come into or leave the inner Solar System they may have their orbit changed by the planets, or alternatively be ejected from the Solar System.〔 It is also possible they may collide with the Sun or a planet.〔 ==Comets with greatest aphelion (2 body heliocentric)== There can be considerable variation for highly eccentric orbits based on the epoch (date) and whether you calculate a heliocentric or barycentric solution. The aphelion point for heliocentric solutions can be highly inaccurate for objects with an orbital eccentricity approaching 1 especially when values are calculated while the object is near perihelion and has not left the planetary region of the Solar System. *C/2012 S4 (PANSTARRS) 504443 or 〔(Comet C/2012 S4 (PANSTARRS) at the JPL Small Body Database )〕 (about 8 light-years) *C/2012 CH17 (MOSS) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Solar System objects by greatest aphelion」の詳細全文を読む スポンサード リンク
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