2002 AT4

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2002 AT4
Discovery [1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date8 January 2002
(first observed only)
MPC designation2002 AT4
NEO · Amor · PHA[1][2]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc4.94 yr (1,805 d)
Aphelion2.7000 AU
Perihelion1.0339 AU
1.8670 AU
2.55 yr (932 d)
0° 23m 11.04s / day
Earth MOID0.043 AU (16.8 LD)
Physical characteristics
Mean diameter
350 m (est. at 0.047)
SMASS = D[2]

2002 AT4 is an as yet unnamed and un-numbered near-Earth object and potentially hazardous asteroid of the Amor group, approximately 350 meters (1,100 feet) 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 dark D-type asteroid[3] which means that it may be reddish in color.

Due to its relatively low transfer cost of ~5.5 km/s,[4] 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.[5]

2002 AT4 orbits the Sun at a distance of 1.0–2.7 AU once every 2 years and 7 months (932 days; semi-major axis of 1.87 AU). Its orbit has an eccentricity of 0.45 and an inclination of 1° with respect to the ecliptic.[2]


  1. ^ a b "2002 AT4". Minor Planet Center. Retrieved 8 November 2018.
  2. ^ a b c d e "JPL Small-Body Database Browser: (2002 AT4)" (2006-11-27 last obs.). Jet Propulsion Laboratory. Retrieved 8 November 2018.
  3. ^ 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): 259–294. Bibcode:2004Icar..170..259B. doi:10.1016/j.icarus.2004.04.004. Archived from the original (PDF) on 14 May 2009. Retrieved 20 April 2009.
  4. ^ "NEA delta_v for spacecraft rendezvous missions".
  5. ^ "ESA".

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