(517103) 2013 EM20

(517103) 2013 EM20
Discovery[1][2]
Discovered byMt. Lemmon Survey
Discovery date12 January 2008
Designations
Designation
  • 2008 AO112
  • 2013 EM20
Orbital characteristics[2]
Epoch 18 April 2013 (JD 2456400.5)
Uncertainty parameter 1[2]
Aphelion1.808 AU (Q)
Perihelion0.9352 AU (q)
1.372 AU (a)
Eccentricity0.3182
1.61 yr
100.4° (M)
Inclination8.359°
73.98°
350.0°
Physical characteristics
Dimensions~310 meters (1,020 ft)[3]
Mass4.1×1010 kg (assumed)[3]
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]

  1. ^ a b Cite error: The named reference MPEC2008-D33 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference jpldata was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Wayback2009-06 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference MPEC2013-E32 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference removed was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Horizons was invoked but never defined (see the help page).