2013 BP73

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2013 BP73
Discovered by Mt. Lemmon Survey (G96)
Discovery date 22 January 2013
MPC designation 2013 BP73
Minor planet category Apollo NEO,
Orbital characteristics[2]
Epoch 2013-Apr-18
Aphelion 2.163 AU (Q)
Perihelion 0.4931 AU (q)
1.328 AU (a)
Eccentricity 0.6287
1.53 yr
139.3° (M)
Inclination 6.853°
Physical characteristics
Dimensions ~310 meters (1,020 ft)[3]
Mass 4.0×1010 kg (assumed)[3]

2013 BP73 (also written 2013 BP73) is a near-Earth asteroid and potentially hazardous object.[2] From discovery until August 2013 when Sentry updated to planetary ephemeris (DE431), it had the 4th highest impact threat on the Palermo Technical Impact Hazard Scale.[4] It was discovered on 22 January 2013 by the Mount Lemmon Survey at an apparent magnitude of 21 using a 1.5-meter (59 in) reflecting telescope.[1] It has an estimated diameter of 310 meters (1,020 ft).[3] Six Precovery images from April 2003 have been located.[5] It was removed from the Sentry Risk Table on 3 January 2014.[6]

It has an observation arc of 10 years with an uncertainty parameter of 2.[2] Perturbations by Earth, Venus, and Mercury will increase the orbital uncertainty over time.[7] When the asteroid only had an observation arc of 52 days, virtual clones of the asteroid that fit the uncertainty region in the known trajectory showed a 1 in 588,000 chance that the asteroid could impact Earth on 11 December 2096.[3] With a 2096 Palermo Technical Scale of −3.42,[3] the odds of impact by 2013 BP73 in 2096 were about 2630 times less[8] than the background hazard level of Earth impacts which is defined as the average risk posed by objects of the same size or larger over the years until the date of the potential impact.[9] Using the nominal orbit, JPL Horizons shows that the asteroid will be 0.9 AU (130,000,000 km; 84,000,000 mi) from Earth on 11 December 2096.[10] 2013 BP73 will make a close approach to Earth on 17 December 2018 that should allow a refinement to the known trajectory.[7]


  1. ^ a b "MPEC 2013-B98 : 2011 BP73". IAU Minor Planet Center. 2013-01-31. Retrieved 2013-07-28.  (K13B73P)
  2. ^ a b c d e f "JPL Small-Body Database Browser: (2013 BP73)" (last observation: 2013-04-12; arc: 10 years). Jet Propulsion Laboratory. Retrieved 2014-01-23. 
  3. ^ a b c d e "Earth Impact Risk Summary: 2013 BP73". Wayback Machine: NASA/JPL Near-Earth Object Program Office. Retrieved 2013-07-28. 
  4. ^ "Sentry Risk Table". Wayback Machine: NASA/JPL Near-Earth Object Program Office. 2013-05-29. Retrieved 2013-08-11. 
  5. ^ "Orbit 2013 BP73". IAU Minor Planet Center. Retrieved 2014-01-23. 
  6. ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2014-01-23. 
  7. ^ a b "JPL Close-Approach Data: (2013 BP73)" (last observation: 2013-04-12; arc: 10 years). Retrieved 2014-01-23. 
  8. ^ Math: 103.42 = 2630
  9. ^ "The Palermo Technical Impact Hazard Scale". NASA/JPL Near-Earth Object Program Office. 31 Aug 2005. Retrieved 2013-07-28. 
  10. ^ Horizons output. "Horizon Online Ephemeris System". Retrieved 2013-07-28.  (Geocentric Solution)

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