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1621 Druzhba
1621 Druzhba, provisional designation 1926 TM, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, about 9 kilometers in diameter. It was discovered by Russian astronomer Sergey Belyavsky at the Crimean Simeiz Observatory on 1 October 1926.〔
The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,216 days). Its orbit shows an eccentricity of 0.12 and is tilted by 3 degrees to the plane of the ecliptic. It has an albedo between 0.2 and 0.3, based on the surveys carried out by IRAS, Akari, and WISE/NEOWISE.〔〔〔
Photometric observations made in 2006 at the Oakley Observatory in Terre Haute, Indiana, found a light curve period of hours, with variation in brightness of less than one magnitude.〔 In 2010, observations were made at the Goat Mountain Astronomical Research Station in Rancho Cucamonga, California, gave a period estimate of 47.9 hours, although this may be a half rotation period instead (99.2 hours).〔 The long rotation period makes accurate estimates more difficult to obtain, so further data is needed to reduce the margin of error.
It was named ''Druzhba'', the is a Slavic word for friendship and the name of several cities, towns and other localities in Ukraine, Russia, Bulgaria and Kazakhstan. The asteroid's name was proposed by the ''Institute of Theoretical Astronomy'' in St. Petersburg.〔
== References ==
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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