Asteroid 3122 Florence passed by our planet yesterday, the biggest near-Earth object to pass us so close in about a century.
Astronomers at the Goldstone Deep Space Communications Complex tracked 2.8 mile wide Florence by using RADAR between August 29th and September 1… and to their surprise they found that there are two moons in orbit around the asteroid. The pair of moons are possibly between 300-1000 feet across. Their orbit appear to be roughly 8 hours for the inner moon and between 22 and 27 hours for the outer moon.
Florence is only the third triple asteroid known in near_earth population out of more than 16,400 that have been discovered to date.
Asteroid 3122 Florence: Images and video: http://earthsky.org/todays-image/photos-asteroid-3122-florence-aug-sep-2017
Asteroid 3122 Florence has two moons: https://cneos.jpl.nasa.gov/news/news199.html