|Discovery site||Lincoln Lab ETS|
|Discovery date||24 April 2008|
|MPC designation||2008 HJ|
|NEO · Apollo |
|Orbital characteristics |
|Epoch 13 January 2016 (JD 2457400.5)|
|Uncertainty parameter 6|
|Aphelion||2.29553 AU (343.406 Gm) (Q)|
|Perihelion||0.968318 AU (144.8583 Gm) (q)|
|1.63192 AU (244.132 Gm) (a)|
|2.08 yr (761.46 d)|
|0° 28m 21.99s /day (n)|
|Earth MOID||0.00170917 AU (255,688 km)|
|Jupiter MOID||2.75111 AU (411.560 Gm)|
|Mass||5×106 kg (assumed)|
Sidereal rotation period
|42.7 s (0.01185 h)|
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.
- "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 2018-01-22.
- MPEC 2008-H26 : 2008 HJ (Discovery)
- 2008 HJ at the JPL Small-Body Database
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