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2000 Herschel
2000 Herschel, provisional designation 1960 OA, is a stony asteroid from the asteroid belt, about 17 kilometers in diameter. It was discovered by astronomer Joachim Schubart at Sonneberg Observatory, Germany on 29 July 1960.〔 The eccentric orbit of the slowly rotating S-type asteroid with an albedo of 0.2 is inclined by 23 degrees to the ecliptic.
Analysis of the light curve for this object appears to show that it is tumbling, with rotation occurring about the non-principal axis. The rotation period is estimated as hours, during which time the magnitude of the object varies by in magnitude.〔 The relatively high orbital eccentricity of this object causes it to come close to the orbit of the planet Mars. This means there is a chance it will eventually collide with the planet, with the odds of a collision estimated at 18% per billion orbits.〔
It is named in honour of the English astronomer of German origin William Herschel who discovered Uranus. While the minor planet with number "1000", 1000 Piazzia, honours the discoverer of the first minor planet, Giuseppe Piazzi, number "2000" does so for Herschel, discoverer of the first telescopic major planet.〔
== 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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