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232 Russia
232 Russia is a large Main belt asteroid. It is classified as a C-type asteroid and is probably composed of primitive carbonaceous material. It was discovered by Johann Palisa on January 31, 1883 in Vienna and was named after the country of Russia. Photometric observations of this asteroid collected during 2007 show a rotation period of 21.8 ± 0.2 hours with a brightness variation of 0.2 ± 0.02 magnitude.〔 A follow up study during 2014 discovered that the rotation period varied depending on the phase angle of observation. The measured rotation varied from 22.016 ± 0.004 hours at a phase angle of 21.5 degrees to 17.0, to 21.904 ± 0.002 hours at phase angles between 5.2 degrees and 9.6 degrees. The reason for this variation has to do with the shape of the asteroid.〔 ==References==
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「232 Russia」の詳細全文を読む
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