2009 WM1 orbits the Sun at a distance of 0.98–1.38 AU once every 15 months (468 days; semi-major axis of 1.18 AU). Its orbit has an eccentricity of 0.17 and an inclination of 26° with respect to the ecliptic.[3]
Even though 2009 WM1 has an Earth MOID of 0.00009 AU (13,000 km; 8,400 mi), the orbit and future close approaches are well determined with an orbital uncertainty of 1.[3]
On 23 November 2059, 2009 WM1 will pass 0.0046 AU (690,000 km; 430,000 mi) from Earth.[7] On 23 November 2199, it will make another close approach at a distance of 0.0005 AU (75,000 km; 46,000 mi) to 0.069 AU, but since it is a close approach and the exact distance in uncertain, future close approaches after 2199 are uncertain.[7]
2014 passage
The 21 May 2014 Earth close approach of 0.3622 AU (54,180,000 km; 33,670,000 mi) should allow a refinement to the orbit.[7] From 7 May 2014 until 2 June 2014 the asteroid will be brighter than apparent magnitude 20.[8] The asteroid will come to opposition on 18 May 2014 when it will be up all night.[8]
