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3200 Phaethon
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3200 Phaethon : ウィキペディア英語版
3200 Phaethon

3200 Phaethon ( , sometimes incorrectly spelled Phaeton) is an Apollo asteroid with an unusual orbit that brings it closer to the Sun than any other named asteroid (though there are several unnamed asteroids, including three numbered ones, with smaller perihelia, e.g. ).〔(JPL Small-Body Database Search Engine results for asteroids with q<0.141 AU ) Retrieved September 5, 2011. Take notice of the orbit condition number (the lower the number, the lower the orbit's uncertainty).〕 For this reason, it was named after the Greek myth of Phaëton, son of the sun god Helios. It is in mean diameter.〔
== Discovery ==

Phaethon was the first asteroid to be discovered using images from a spacecraft. Simon F. Green and John K. Davies discovered it in images from October 11, 1983, while searching Infrared Astronomical Satellite (IRAS) data for moving objects. It was formally announced on October 14 in IAUC 3878 along with optical confirmation by Charles T. Kowal, who reported it to be asteroidal in appearance. Its provisional designation was 1983 TB, and it later received the numerical designation and name 3200 Phaethon in 1985.

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