What a time we live in. We keep finding new places in the solar system… and places orbiting places.
Makemake is a little over 1400 km in diameter (about 2/3 Pluto), and orbits from 38.6 AU to 52.8 AU. Hubble has recently spotted a 100 km diameter chunk of something resembling coal orbiting some 21,000 km from Makemake. The new moon has been nicknamed, unsurprisingly, MK 2.