A ring around Haumea

It's amazing what can be learned from a quick occultation.  Using one of these momentary occasions when a dwarf planet in the Kuiper Belt passes in front of a star, astronomers have determined that this dwarf planet the size of Greenland has a ring of debris around it.

Amazing to me is that the gravity of this little planetoid is strong enough to keep the ring around it, but after all, the stuff in the ring is probably dust and pebbles.  Not much gravity is neeed to keep them in orbit.

Astronomers spot first ring around a distant dwarf planet

The actual article, written by astronomers:

The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation