2008 HJ
2008 HJ is a sub-kilometer asteroid, classified as near-Earth object of the Apollo group.
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 were 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 17,000 chance of impacting Earth on May 2, 2081.[3] An impact from this object would be comparable to the Chelyabinsk meteor.
See also
- List of fast rotators (minor planets)
References
- ^ 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 30 March 2016.
- ^ Record spin for new-found asteroid, BBC.com, 30 May 2008
- ^ "Earth Impact Risk Summary: 2008 HJ". NASA/JPL Near-Earth Object Program Office. Retrieved 22 January 2018.
External links
- MPEC 2008-H26 : 2008 HJ (Discovery)
- 2008 HJ at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
- 2008 HJ at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
- 2008 HJ at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters
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