2008 HJ

Asteroid February 2018 yes #FFC2E0 2008 HJ LINEAR Lincoln Lab ETS 24 April 2008 2008 HJ NEOApollo 21 November 2025 (JD 2461000.5) 2.29639 AU Gm on on (Q) 0.967561 AU Gm on (q) 1.63198 AU Gm on (a) 0.40712 (e) 2.08 yr (761.50 d) 139.306° (M) 0.923627° (i) 47.4545° (Ω) 204.2086° (ω) 12×24 m 5 million kg (assumed) 0.01185 h s on on flip 25.85 0.472752 ms /day (n) 6 0.00185855 AU km on 2.74944 AU Gm on 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. It is listed on the Sentry Risk Table with a 1 in 17,000 chance of impacting Earth on May 2, 2081. An impact from this object would be comparable to the Chelyabinsk meteor. See also List of fast rotators (minor planets) References Record spin for new-found asteroid, BBC.com, 30 May 2008 last observation: 2008-04-30; arc: 6 days; uncertainty: 6 JPL Small-Body Database Browser: (2008 HJ) http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2008HJ Jet Propulsion Laboratory 30 March 2016 Earth Impact Risk Summary: 2008 HJ NASA/JPL Near-Earth Object Program Office https://cneos.jpl.nasa.gov/sentry/details.html#?des=2008%20HJ 2018-01-22 External links MPEC 2008-H26 : 2008 HJ (Discovery) 2008+HJ 2008HJ # Category:Minor planet object articles (unnumbered) Category:Potential impact events caused by near-Earth objects # 20080424