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(415713) 1998 XX2
is a small asteroid that is a Near-Earth object, a Potentially Hazardous Asteroid (PHA), and an Aten asteroid. This asteroid was discovered December 8, 1998, by Lincoln Near-Earth Asteroid Research (LINEAR), and was found to have frequent approaches to the Earth, Venus, and Mercury.
==Orbit==
The orbit of is well-established, and appears on the list of PHA close approaches to Earth, with the next approach at a distance of on November 28, 2028.〔(【引用サイトリンク】url=http://www.minorplanetcenter.net/iau/lists/PHACloseApp.html )〕 During the years 1900–2200, close approaches are of the Earth (on Nov 30, 1991), as close as of Venus (on Jan 28, 1902 and April 8, 2039), and as close as of Mercury on 12 occasions.〔(【引用サイトリンク】url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1993%20DA;cad=1#cad )〕 For comparison, the distance to the Moon is about 0.0026 AU (384,400 km).
From 1993 to 1998, was the asteroid with the lowest known aphelion at 1.023 AU, and was thus the closest thing to an Apohele asteroid known at the time. When was discovered November 25, 1998, it was found to have a slightly smaller aphelion (1.019 AU) than , so took the title. However, lost its smallest aphelion title almost immediately when (aphelion of 1.014 AU) was discovered only a few weeks later on December 8, 1998.
The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 7.7.〔
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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