(332446) 2008 AF4

(332446) 2008 AF₄

Discovery[1]
Discovered by	LINEAR
Discovery site	Lincoln Lab's ETS
Discovery date	10 January 2008
Designations
MPC designation	(332446) 2008 AF4
Alternative designations	2008 AF4
Minor planet category	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
Semi-major axis	1.3825 AU
Eccentricity	0.4109
Orbital period (sidereal)	1.63 yr (594 days)
Mean anomaly	8.0690°
Mean motion	0° 36^m 22.68^s / day
Inclination	8.9193°
Longitude of ascending node	109.38°
Argument of perihelion	293.39°
Earth MOID	0.0025 AU · 1 LD
Physical characteristics
Dimensions	390 m
Mass	8.3×10^10 kg
Absolute magnitude (H)	19.7[1]

(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]

2183 passage

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]

References

1. "JPL Small-Body Database Browser: 2008 AF4". Retrieved 20 April 2016.
2. "WayBack Machine archive from 1 January 2008". Wayback Machine. 15 January 2008. Archived from the original on 15 January 2008. Retrieved 7 September 2013.
3. "WayBack Machine archive from 14 February 2008". Wayback Machine. 14 February 2008. Archived from the original on 14 February 2008. Retrieved 7 September 2013.
4. "WayBack Machine archive from 16 March 2008". Wayback Machine. 16 March 2008. Archived from the original on 16 March 2008. Retrieved 7 September 2013.
5. "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002. Retrieved 6 November 2011.
6. "JPL Close-Approach Data: 332446 (2008 AF4)" (last observation: 2013-03-19; arc: 10.8 years). Retrieved 7 September 2013.

External links

• (332446) 2008 AF4 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• (332446) 2008 AF4 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• (332446) 2008 AF4 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters