2011 EO40

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2011 EO40
Discovery[1]
Discovered by Richard A. Kowalski
(Mount Lemmon Survey)
Discovery date March 10, 2011
Designations
MPC designation 2011 EO40
Apollo NEO PHA,[2][3][4]
Earth crosser
Orbital characteristics[3][5]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 6
Aphelion 2.5479 AU (381.16 Gm)
Perihelion 0.76042 AU (113.757 Gm)
1.6542 AU (247.46 Gm)
Eccentricity 0.54030
2.13 yr (777.10 d)
137.89°
Inclination 3.3630°
50.298°
17.071°
Earth MOID 0.0482051 AU (7.21138 Gm)
Jupiter MOID 2.79322 AU (417.860 Gm)
Physical characteristics
Dimensions 150-330 m[a][6]
21.5[3]
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2011 EO40, also written 2011 EO40, is an Apollo asteroid and a possible candidate for the parent body of the Chelyabinsk superbolide.[7][8][9]

Discovery, orbit and physical properties

2011 EO40 was discovered by Richard A. Kowalski on March 10, 2011 while observing for the Mount Lemmon Survey.[1][10]

Its orbit is typical of Apollo asteroids and is characterized by significant eccentricity (0.54), low inclination (3.36º), and a semi-major axis of 1.65 AU.[10] Upon discovery, it was classified as an Earth crosser, a near-Earth asteroid (NEA) and a potentially hazardous asteroid (PHA) by the Minor Planet Center. It was listed on the Sentry Risk Table for less than one day.[11] Its orbit is in need of additional observations to determine if it is part of an asteroid family; as of October 2015 the orbit is determined using just twenty observations spanning an observation arc of 34 days.[3] 2011 EO40 has an absolute magnitude of 21.5,[3] which gives a characteristic diameter of about 200 metres (660 ft).[6]

Relationship to the Chelyabinsk superbolide

Recent calculations indicate that this object is a plausible candidate to be the parent body of the Chelyabinsk superbolide, since its orbit is very similar to the computed, pre-impact path of the Chelyabinsk meteoroid.[7][8][9] It has relatively frequent close encounters with Venus, the Earth–Moon system, and Mars. It had a close encounter with Earth on January 28, 2011 at 0.0953 AU (14,260,000 km; 8,860,000 mi),[3] and it will have a nominal Earth approach on September 23, 2025 at around 0.06 AU (9,000,000 km; 5,600,000 mi).[3] Asteroid 2011 EO40 experiences close approaches to the Earth–Moon system following a rather regular pattern, every 17 years approximately due to the combined action of multiple secular resonances.[8]

Visibility

Future opposition windows are: June 7, 2016 at magnitude 24.5, and May 28, 2018 at magnitude 24.6. The best observation window will be on September 2–23, 2025.[3] Depending on the Earth approach distance (0.04–0.12 AU),[3] it should be brighter than magnitude 19.[12]

See also

Notes

  • ^ This is assuming an albedo of 0.20–0.04.

References

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External links

  1. ↑ 1.0 1.1 Discovery MPEC
  2. ↑ List Of Apollo Minor Planets
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ NEODyS-2 on 2011 EO40 Retrieved 2013-07-31
  6. ↑ 6.0 6.1 Absolute-magnitude conversion table (H)
  7. ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ 8.0 8.1 8.2 Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ 10.0 10.1 MPC data on 2011 EO40
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found. (2.7e-07 = 1 in 3,704,000 chance)
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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