Astronomy:2008 AO112

From HandWiki
2008 AO112
Discovery[1][2]
Discovered byMt. Lemmon Survey
Discovery date12 January 2008
Designations
Designation
  • 2008 AO112
  • 2013 EM20
Minor planet category
Orbital characteristics[2]
Epoch 18 April 2013 (JD 2456400.5)
Uncertainty parameter 1[2]
|{{{apsis}}}|helion}}1.808 AU (Q)
|{{{apsis}}}|helion}}0.9352 AU (q)
1.372 AU (a)
Eccentricity0.3182
Orbital period1.61 yr
Mean anomaly100.4° (M)
Inclination8.359°
Longitude of ascending node73.98°
350.0°
Physical characteristics
Dimensions~310 meters (1,020 ft)[3]
Mass4.1×1010 kg (assumed)[3]
Absolute magnitude (H)19.9[2]


2008 AO112 (also written 2008 AO112) is an Apollo near-Earth asteroid and potentially hazardous object.[2] It was discovered on 12 January 2008 by the Mount Lemmon Survey at an apparent magnitude of 21 using a 1.5-meter (59 in) reflecting telescope.[1] The asteroid was quickly lost and had an estimated diameter of 310 meters (1,020 ft).[3] On 25 June 2009, with an observation arc of only 1 day in January 2008, the asteroid had a 1 in 4 million chance of impacting Earth on that very day.[3] The virtual impactor had not been eliminated from the Sentry Risk Table by the day of the potential impact.

The asteroid was recovered on 5 March 2013 as 2013 EM20.[4] Precovery images from 7 April 1997 at Kitt Peak National Observatory were located.[2] It was removed from the Sentry Risk Table on 30 March 2013.[5] It is now known that on 25 June 2009 the asteroid was 1.45 AU from Earth.[6]

References

  1. 1.0 1.1 "MPEC 2008-D33". IAU Minor Planet Center. 2008-02-25. http://www.minorplanetcenter.net/mpec/K08/K08D33.html. Retrieved 2013-08-28.  (K08AB2O)
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "JPL Small-Body Database Browser: (2013 EM20 = 2008 AO112)". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2008AO112. Retrieved 2013-08-28. 
  3. 3.0 3.1 3.2 3.3 "Earth Impact Risk Summary: 2008 AO112". Wayback Machine: NASA/JPL Near-Earth Object Program Office. 2009-06-25. Archived from the original on June 25, 2009. https://web.archive.org/web/20090625081507/http://neo.jpl.nasa.gov/risk/2008ao112.html. Retrieved 2013-08-28.  (2.5e-07 = 1 in 4,000,000 chance)
  4. "MPEC 2013-E32 : 2013 EM20". IAU Minor Planet Center. 2013-03-08. http://www.minorplanetcenter.net/mpec/K13/K13E32.html. Retrieved 2013-08-28.  (K13E20M)
  5. "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. http://neo.jpl.nasa.gov/risk/removed.html. Retrieved 2013-08-28. 
  6. Horizons output. "Horizon Online Ephemeris System". http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2008AO112. Retrieved 2013-08-28.  (Geocentric Solution)

External links