(332446) 2008 AF4

(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]

(332446) 2008 AF4
Discovery [1]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date10 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 arc13.78 yr (5,032 days)
Aphelion1.9506 AU
Perihelion0.8144 AU
1.3825 AU
Eccentricity0.4109
1.63 yr (594 days)
8.0690°
0° 36m 22.68s / day
Inclination8.9193°
109.38°
293.39°
Earth MOID0.0025 AU · 1 LD
Physical characteristics
Dimensions390 m
Mass8.3×1010 kg
19.7[1]

    2183 passage

    2008 AF4 may pass as close as 0.002 AU (300,000 km; 190,000 mi) from Earth on 2183-Jan-12.[6] But the nominal solution shows the asteroid passing 0.009 AU (1,300,000 km; 840,000 mi) from Earth.[6]

    References
    1. "JPL Small-Body Database Browser: 2008 AF4". Retrieved 20 April 2016.
    2. "WayBack Machine archive from 1 January 2008". Wayback Machine. 2008-01-15. Archived from the original on 15 January 2008. Retrieved 2013-09-07.
    3. "WayBack Machine archive from 14 February 2008". Wayback Machine. 2008-02-14. Archived from the original on 14 February 2008. Retrieved 2013-09-07.
    4. "WayBack Machine archive from 16 March 2008". Wayback Machine. 2008-03-16. Archived from the original on 16 March 2008. Retrieved 2013-09-07.
    5. "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2011-11-06.
    6. "JPL Close-Approach Data: 332446 (2008 AF4)" (last observation: 2013-03-19; arc: 10.8 years). Retrieved 2013-09-07.


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