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[personal profile] james_davis_nicoll
From the Planetary Society Blog:

Take Orcus and Vanth. Orcus, if you haven't heard of it before, is probably the seventh largest known trans-Neptunian object, and Vanth is its satellite. Here's the weird thing I just found out about Orcus and Vanth by reading a 2009 paper by Mike Brown, Darin Ragozzine, John Stansberry, and Wesley Fraser. Vanth could be a biggish moon containing 3% of the mass of the whole system. But it could also be a truly enormous moon containing a third of the mass of the Orcus-Vanth system.
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james_davis_nicoll

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