(332446) 2008 AF4 is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, which was listed on the Sentry Risk Table in January 2008 with a Torino Scale rating of 1.[2] The asteroid showed a 1 in 71,000 chance of impact on 9 January 2089.[2] It was briefly downgraded to Torino Scale 0 in February 2008, but still showed a cumulative 1 in 53,000 chance of an impact.[3] In March it was back at Torino Scale 1 with a 1 in 28,000 chance of impact on 9 January 2089.[4] By mid April 2008, it was back to Torino Scale 0. It was removed from the Sentry Risk Table on 19 December 2009.[5]
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab’s ETS |
| Discovery date | 10 January 2008 |
| Designations | |
| (332446) 2008 AF4 | |
| 2008 AF4 | |
| NEO · Apollo · PHA[1] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 13.78 yr (5,032 days) |
| Aphelion | 1.9506 AU |
| Perihelion | 0.8144 AU |
| 1.3825 AU | |
| Eccentricity | 0.4109 |
| 1.63 yr (594 days) | |
| 8.0690° | |
| 0° 36m 22.68s / day | |
| Inclination | 8.9193° |
| 109.38° | |
| 293.39° | |
| Earth MOID | 0.0025 AU · 1 LD |
| Physical characteristics | |
| Dimensions | 390 m |
| Mass | 8.3×1010 kg |
| 19.7[1] | |
2008 AF4 may pass as close as 0.002 AU (300,000 km; 190,000 mi) from Earth on 12 January 2183.[6] But the nominal solution shows the asteroid passing 0.009 AU (1,300,000 km; 840,000 mi) from Earth.[6]
- ^ a b c d “JPL Small-Body Database Browser: 2008 AF4”. Retrieved 20 April 2016.
- ^ a b “WayBack Machine archive from 1 January 2008”. Wayback Machine. 15 January 2008. Archived from the original on 15 January 2008. Retrieved 7 September 2013.
- ^ “WayBack Machine archive from 14 February 2008”. Wayback Machine. 14 February 2008. Archived from the original on 14 February 2008. Retrieved 7 September 2013.
- ^ “WayBack Machine archive from 16 March 2008”. Wayback Machine. 16 March 2008. Archived from the original on 16 March 2008. Retrieved 7 September 2013.
- ^ “Date/Time Removed”. NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002. Retrieved 6 November 2011.
- ^ a b “JPL Close-Approach Data: 332446 (2008 AF4)” (last observation: 2013-03-19; arc: 10.8 years). Retrieved 7 September 2013.
- (332446) 2008 AF4 at NeoDyS-2, Near Earth Objects—Dynamic Site
- (332446) 2008 AF4 at ESA–space situational awareness
- (332446) 2008 AF4 at the JPL Small-Body Database
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