|Discovered by||E. F. Helin, J. Alu|
|Discovery date||29 June 1989|
|MPO 244277, 1992 WA|
|Epoch 24 October 2005 (JD 2453667.5)|
|Uncertainty parameter 0|
|Observation arc||9733 days (26.65 yr)|
|Aphelion||1.44623 AU (216.353 Gm)|
|Perihelion||1.09872 AU (164.366 Gm)|
|1.27247 AU (190.359 Gm)|
|1.44 yr (524.29 d)|
Average orbital speed
|0° 41m 11.911s / day|
|Earth MOID||0.0827215 AU (12.37496 Gm)|
|19 h (0.79 d)|
(10302) 1989 ML is an as yet unnamed near-Earth asteroid. It is approximately 0.6 km in diameter. An Amor asteroid, it orbits between Earth and Mars. It is an X-type asteroid, so its surface composition is yet unknown. It was discovered by Eleanor F. Helin and Jeff T. Alu at Palomar Observatory on 29 June 1989.
The delta-v ('effort') required to reach 1989 ML from a low-Earth orbit is only 4.8 km/s, ranking fifth (as of March 2007) amongst the near-Earth asteroids with well-established orbits. 1989 ML is thus particularly 'easy' (and 'cheap') to reach by spacecraft.
1989 ML was considered as a target of the Japanese spacecraft Hayabusa (then Muses-C) but had to be given up due to technical reasons. It was also considered by the European Space Agency as a candidate target for the Don Quijote mission to study the effects of impacting a spacecraft into an asteroid; however, they too changed to other targets.