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An abundant population of small irregular satellites around Jupiter

机译:木星周围大量小型不规则卫星

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Irregular satellites have eccentric orbits that can be highly inclined or even retrograde relative to the equatorial planes of their planets. These objects cannot have formed by circumplanetary accretion, unlike the regular satellites that follow uninclined, nearly circular and prograde orbits(1). Rather, they are probably products of early capture from heliocentric orbits(2-5). Although the capture mechanism remains uncertain, the study of irregular satellites provides a window on processes operating in the young Solar System. Families of irregular satellites recently have been discovered around Saturn ( thirteen members, refs 6, 7), Uranus ( six, ref. 8) and Neptune ( three, ref. 9). Because Jupiter is closer than the other giant planets, searches for smaller and fainter irregular satellites can be made. Here we report the discovery of 23 new irregular satellites of Jupiter, so increasing the total known population to 32. There are five distinct satellite groups, each dominated by one relatively large body. The groups were most probably produced by collisional shattering of precursor objects after capture by Jupiter. [References: 28]
机译:不规则卫星的偏心轨道相对于其行星的赤道平面可能会高度倾斜甚至逆行。这些物体不可能是由外行星的积聚形成的,不像遵循不倾斜,近圆形和渐进轨道的常规卫星(1)。相反,它们可能是早期从日心轨道捕获的产物(2-5)。尽管捕获机制仍不确定,但对不规则卫星的研究为年轻太阳系中运行的过程提供了一个窗口。最近在土星(13个成员,参考文献6、7),天王星(6个,参考文献8)和海王星(3个,参考文献9)附近发现了不规则卫星的家族。由于木星比其他巨型行星更近,因此可以寻找更小,更暗的不规则卫星。在这里,我们报告发现了23颗新的木星不规则卫星,从而使已知总数增加到32。有五个不同的卫星群,每个卫星群由一个相对较大的主体控制。这些组很可能是由木星捕获后,前体物体发生碰撞破碎而产生的。 [参考:28]

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