Astronomy:(517103) 2013 EM20
| Discovery[1][2] | |
|---|---|
| Discovered by | Mt. Lemmon Survey |
| Discovery date | 12 January 2008 |
| Designations | |
Designation |
|
| 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) | |
| Eccentricity | 0.3182 |
| Orbital period | 1.61 yr |
| Mean anomaly | 100.4° (M) |
| Inclination | 8.359° |
| Longitude of ascending node | 73.98° |
| 350.0° | |
| Physical characteristics | |
| Dimensions | ~310 meters (1,020 ft)[3] |
| Mass | 4.1×1010 kg (assumed)[3] |
| Absolute magnitude (H) | 19.9[2] |
(517103) 2013 EM20 (also designated 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
- ↑ 1.0 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)
- ↑ 2.0 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.
- ↑ 3.0 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)
- ↑ "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)
- ↑ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. http://neo.jpl.nasa.gov/risk/removed.html. Retrieved 2013-08-28.
- ↑ 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
- (517103) 2013 EM20 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- (517103) 2013 EM20 at ESA–space situational awareness
- (517103) 2013 EM20 at the JPL Small-Body Database
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