![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
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.