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(33342) 1998 WT24
is an Aten asteroid with a diameter of about 900 meters, located in Venus's zone of influence that has frequent close encounters with Mercury, Venus, and Earth.〔 It is also one of the best studied potentially hazardous asteroids and was the 10th Aten to be numbered. The asteroid will make a close approach to Earth in early December 2015, and will reach about apparent magnitude 11.〔
==Low aphelion==
was discovered on November 25, 1998, by LINEAR about four months after a close encounter with the planet Mercury (about 0.047 AU).〔 At the time of its discovery, astronomers were trying to find the first Apohele asteroid (one that is always closer to the Sun than Earth). All asteroids known at the time that got closer to the Sun than Earth also crossed Earth's orbit. Earlier that year, David J. Tholen claimed to have spotted the first Apohele asteroid, which was dubbed . However, the object was lost without being confirmed. Thus, 1993 DA remained the asteroid with the lowest known aphelion at 1.023 AU. When was discovered, it was found to have a slightly smaller aphelion (1.019 AU) than 1993 DA, and was thus the closest thing to an Apohele asteroid known at the time. It lost its smallest aphelion title almost immediately when was discovered only a few weeks later (aphelion = 1.014 AU). Asteroids with even smaller aphelions were discovered until February 2003, when finally, an asteroid with an aphelion smaller than 1.000 AU was discovered. This was 163693 Atira, the first confirmed Apohele asteroid.
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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