Happy New Year! Today we observed our first near-Earth asteroid of the year, 2016 AZ8, and discovered it has a moon! The larger body is at least 400 m in diameter and at least twice the size of the moon, which orbits at least 400 m away. #TeamRadar #AreciboScience pic.twitter.com/Ag5OiVQQG2

— Arecibo Radar (@AreciboRadar) January 4, 2019