The asteroid 2004 BL86 which passed so close to Earth last night apparently has its own moon. Unfortunately, because of persistent fog, I did not get to see it.
Also, astronomers have discovered a star surrounded by a system of rings. "Astronomers discovered more than 30 rings eclipsing the very young sun-like star J1407, each of them tens of millions of miles in diameter." Gaps in the rings suggest that moons or planetoids have formed.