2008 HJ

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2008 HJ
Discovery and designation
Discovered by Lincoln Laboratory ETS (LINEAR)
Discovery date April 24, 2008
MPC designation 2008 HJ
Orbital characteristics[1]
Epoch August 27, 2011 (2455800.5)
Aphelion 2.29608 AU (Q)
Perihelion 0.967688 AU (q)
1.6319 AU (a)
Eccentricity 0.40701
2.0847 yr (761.4 d)
Inclination 0.9267°
Physical characteristics
Dimensions 12×24 m
Mass 5×106 kg
42.7 s (0.01185 h)

2008 HJ is a small near-Earth asteroid orbiting the Sun. It was discovered by Lincoln Laboratory ETS, New Mexico. Observers M. Bezpalko, D. Torres, R. Kracke, G. Spitz, J. Kistler. Richard Miles using the Faulkes Telescope South at Siding Spring Observatory, Australia determined that the asteroid rotates rapidly. It measures only 12 m by 24 m and is very dense, having a mass of about 5,000 tonnes. If the asteroid was not dense, it is probable that the rapid rotation would cause the asteroid to disrupt and fly apart.

At the time of discovery, 2008 HJ had the smallest known rotation period in the Solar System, completing one revolution every 42.7 seconds.[1][2]

It is listed on the Sentry Risk Table with a 1 in 15,000 chance of impacting Earth on May 2, 2081.[3] An impact from this object would be comparable to the Chelyabinsk meteor.


  1. ^ a b c d "JPL Small-Body Database Browser: (2008 HJ)" (last observation: 2008-04-30; arc: 6 days; uncertainty: 6). Jet Propulsion Laboratory. Retrieved 2011-11-14. 
  2. ^ Record spin for new-found asteroid, BBC.com, 30 May 2008
  3. ^ "Earth Impact Risk Summary: 2008 HJ". NASA/JPL Near-Earth Object Program Office. Retrieved 2014-04-16. 

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