2010_RX30
2010 RX30 is a micro-asteroid, classified as near-Earth object of the Aten group. On 8 September 2010 at 09:51 UTC, it passed between the Earth and the Moon approaching Earth within 248000kilometres above Japan.[4]
NASA estimated its size to be 12 metres in diameter with a mass of around 2500 tonnes.[3]
The asteroid was discovered by the Catalina Sky Survey near Tucson, Arizona on 5 September 2010, along with 2010 RF12.[5]