Is a moon made entirely of water possible?

I have two earth clones, in essence, separated by *16550 miles (26350 kilometers). They are, of course, tidally locked, and orbit each other once every 24 hours. These planets orbit a sun identical to ours in the same time as earth, except their orbit around the sun is perfectly circular. Now, I want to add a little bit more to the system. A moon with half the mass of ours.

But there is a catch. This moon is made of ~90% ice. Because I don't mind some materials in there that aren't water, but they must be spread throughout the moon, and not gathered together as the moon's core.

The moon is in the position shown in the diagram below, and it has an orbital period of 72 hours. Assume the ellipses are actually circles.

*16550 miles = a

"Note: I take credit for this graphic." - HDE 226868

posted about 8 years ago

Xandar The Zenon‭

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