Radar observations made with NASA’s 70-metre-wide Deep Space Network antenna at Goldstone, California yesterday show that close-approach asteroid 2004 BL86 has a small moon.
On 26th January, asteroid 2004 BL86 will pass Earth just three lunar distances away. It will be the closest approach by any known space rock this large until asteroid 1999 AN10 flies past our planet in 2027.