Jupiter's new moon

时间:2019-03-06 01:14:03166网络整理admin

A celestial speck that astronomers thought was a meteoroid is in fact Jupiter’s 17th moon—its smallest, and the first found for 26 years. University of Arizona astronomers used the 36-inch telescope at Kitt Peak to track the object for a month last year. They estimate that the object orbits Jupiter once every two years at an average distance of 24 million kilometres. The new moon may measure only 5 kilometres across,