|Discovered by||Lincoln Laboratory Near-Earth Asteroid Research (LINEAR) Team|
|Discovery date||January 08, 2002|
|Epoch 13 January 2016 (JD 2457400.5)|
|Uncertainty parameter 0|
|Observation arc||1805 days (4.94 yr)|
|Aphelion||2.7006668 AU (404.01400 Gm)|
|Perihelion||1.03349733 AU (154.609000 Gm)|
|1.8670820 AU (279.31149 Gm)|
|2.55 yr (931.84 d)|
|0° 23m 10.79s /day|
|Earth MOID||0.0422244 AU (6.31668 Gm)|
|Jupiter MOID||2.28286 AU (341.511 Gm)|
|Dimensions||Diameter: 170-380 m|
2002 AT4 (also written 2002 AT4) is an as yet unnamed and un-numbered near-Earth asteroid. It is approximately 160–370 metres in diameter. It has an eccentric orbit that brings it sometimes close to Earth's orbit, and sometimes halfway between Mars and Jupiter. It is a D-type asteroid which means that it may be reddish in colour, and it orbits amongst the amor family of asteroids.
Due to its relatively low transfer cost of ~5.5 km/s, 2002 AT4 was under consideration 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, it is no longer under consideration.
- "EARN Database: 2002 AT4".
- "JPL Small-Body Database Browser: (2002 AT4)". Jet Propulsion Laboratory. Retrieved 30 March 2016.
- Binzel, Richard P.; et al. (August 2004). "Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes" (PDF). Icarus 170 (2): 259. Bibcode:2004Icar..170..259B. doi:10.1016/j.icarus.2004.04.004. Archived from the original on 2009-05-14. Retrieved 2009-04-20.
- "NEA delta_v for spacecraft rendezvous missions".