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Discovery of two new satellites of Pluto.

机译:发现冥王星的两颗新卫星。

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Pluto's first known satellite, Charon, was discovered in 1978. It has a diameter (approximately 1,200 km) about half that of Pluto, which makes it larger, relative to its primary, than any other moon in the Solar System. Previous searches for other satellites around Pluto have been unsuccessful, but they were not sensitive to objects less, similar150 km in diameter and there are no fundamental reasons why Pluto should not have more satellites. Here we report the discovery of two additional moons around Pluto, provisionally designated S/2005 P 1 (hereafter P1) and S/2005 P 2 (hereafter P2), which makes Pluto the first Kuiper belt object known to have multiple satellites. These new satellites are much smaller than Charon, with estimates of P1's diameter ranging from 60 km to 165 km, depending on the surface reflectivity; P2 is about 20 per cent smaller than P1. Although definitive orbits cannot be derived, both new satellites appear to be moving in circular orbits in the same orbital plane as Charon, with orbital periods of approximately 38 days (P1) and approximately 25 days (P2).
机译:冥王星的第一个已知卫星Charon于1978年被发现。它的直径(约1200公里)约是冥王星直径的一半,这使其相对于原初的直径更大,比太阳系中的任何其他卫星都要大。先前对冥王星周围其他卫星的搜索一直没有成功,但是它们对较小的物体(直径约150 km)不敏感,并且没有根本的理由解释为什么冥王星不应该拥有更多的卫星。在这里,我们报告在冥王星附近发现了另外两个卫星,临时命名为S / 2005 P 1(以下称P1)和S / 2005 P 2(以下称P2​​),这使冥王星成为第一个拥有多颗卫星的柯伊伯带天体。这些新卫星比Charon小得多,根据表面反射率,P1的直径估计在60 km至165 km之间。 P2比P1小约20%。尽管无法确定轨道,但两颗新卫星似乎都在与Charon相同的轨道平面内以圆形轨道运动,轨道周期分别约为38天(P1)和25天(P2)。

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