(517103) 2013 EM20
| Discovery[1] | |
|---|---|
| Discovered by | Mt. Lemmon Survey (G96) |
| Discovery date | 12 January 2008 |
| Designations | |
Designation | 2008 AO112 2013 EM20[2] |
| Apollo NEO, PHA[2] | |
| Orbital characteristics[2] | |
| Epoch 2013-Apr-18 (Uncertainty=1)[2] | |
| Aphelion | 1.808 AU (Q) |
| Perihelion | 0.9352 AU (q) |
| 1.372 AU (a) | |
| Eccentricity | 0.3182 |
| 1.61 yr | |
| 100.4° (M) | |
| Inclination | 8.359° |
| 73.98° | |
| 350.0° | |
| Physical characteristics | |
| Dimensions | ~310 meters (1,020 ft)[3] |
| Mass | 4.1×1010 kg (assumed)[3] |
| 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 1.45AU from Earth.[6]
References
- ^ a b "MPEC 2008-D33". IAU Minor Planet Center. 2008-02-25. Retrieved 2013-08-28. (K08AB2O)
- ^ a b c d e f g "JPL Small-Body Database Browser: (2013 EM20 = 2008 AO112)" (last observation: 2013-05-15; arc: 16.1 years). Jet Propulsion Laboratory. Retrieved 2013-08-28.
- ^ a b c d "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. Retrieved 2013-08-28.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) (2.5e-07 = 1 in 4,000,000 chance) - ^ "MPEC 2013-E32 : 2013 EM20". IAU Minor Planet Center. 2013-03-08. Retrieved 2013-08-28. (K13E20M)
- ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2013-08-28.
- ^ Horizons output. "Horizon Online Ephemeris System". Retrieved 2013-08-28. (Geocentric Solution)
External links
- Orbital simulation from JPL (Java) / Ephemeris
- (517103) 2013 EM20 at the JPL Small-Body Database
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