Astronomy:2011 EO40

From HandWiki
2011 EO40
Discovery[1]
Discovered byRichard A. Kowalski
(Mount Lemmon Survey)
Discovery date10 March 2011
Designations
2011 EO40
Minor planet category
Orbital characteristics[3][5]
Epoch 21 November 2025 (JD 2461000.5)
Uncertainty parameter 1
|{{{apsis}}}|helion}}2.5481 astronomical unit|AU (381.19 Gm)
|{{{apsis}}}|helion}}0.76020 AU (113.724 Gm)
1.65416 AU (247.459 Gm)
Eccentricity0.54043
Orbital period2.1275 yr (777.08 d)
Mean anomaly5.6°
Mean motion0° 27m 47.772s / day
Inclination3.3615°
Longitude of ascending node50.172°
17.230°
Earth MOID0.048041 AU (7.1868 Gm)
Jupiter MOID2.79521 AU (418.157 Gm)
Physical characteristics
Dimensions120–280 m[a][6]
Absolute magnitude (H)21.9[3]


2011 EO40 is an asteroid, classified as a near-Earth object and a potentially hazardous asteroid of the Apollo group. It is 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 10 March 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 28 January 2011 at 0.0953 astronomical unit|AU (14,260,000 km; 8,860,000 mi),[3] and it will have a nominal Earth approach on 23 September 2025 at about 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: 7 June 2016 at magnitude 24.5, and 28 May 2018 at magnitude 24.6. 2011 EO40 wasn't observed during either opposition.[10] The asteroid was recovered on 15 August 2025 by Pan-STAARS.[12] The best observation window will be on 2–23 September 2025.[3] Depending on the Earth approach distance (0.04–0.12 AU),[3] it should be brighter than magnitude 19.[13]

See also

Notes

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

References

  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 "JPL Small-Body Database Browser: (2011 EO40)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2011EO40&view=OPC. 
  4. ↑ "List Of The Potentially Hazardous Asteroids (PHAs)". Minorplanetcenter.net. http://www.minorplanetcenter.net/iau/lists/Dangerous.html. Retrieved 2014-06-27. 
  5. ↑ NEODyS-2 on 2011 EO40 Retrieved 2013-07-31
  6. ↑ 6.0 6.1 Asteroid Size Estimator
  7. ↑ 7.0 7.1 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (21 November 2013). "The Chelyabinsk superbolide: a fragment of asteroid 2011 EO40?". Monthly Notices of the Royal Astronomical Society: Letters 436 (1): L15–L19. doi:10.1093/mnrasl/slt103. Bibcode: 2013MNRAS.436L..15D. 
  8. ↑ 8.0 8.1 8.2 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (1 September 2014). "Reconstructing the Chelyabinsk event: pre-impact orbital evolution". Monthly Notices of the Royal Astronomical Society: Letters 443 (1): L39–L43. doi:10.1093/mnrasl/slu078. Bibcode: 2014MNRAS.443L..39D. 
  9. ↑ 9.0 9.1 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl; Aarseth, S. J. (10 October 2015). "Chasing the Chelyabinsk asteroid N-body style". The Astrophysical Journal 812 (1): 26 (22 pp). doi:10.1088/0004-637X/812/1/26. Bibcode: 2015ApJ...812...26D. 
  10. ↑ 10.0 10.1 10.2 MPC data on 2011 EO40
  11. ↑ "Observations of small Solar-System bodies". hohmanntransfer. 2011-03-11. http://www.hohmanntransfer.com/mn/11/11070_0311.htm#2011EO40. Retrieved 2013-08-06.  (2.7e-07 = 1 in 3,704,000 chance)
  12. ↑ "MPEC 2025-Q20 : 2011 EO40". https://www.minorplanetcenter.net/mpec/K25/K25Q20.html. 
  13. ↑ "2011EO40 Ephemerides for 23 August 2025 through 30 September 2025". NEODyS (Near Earth Objects – Dynamic Site). https://newton.spacedys.com/neodys2/index.php?pc=1.1.3.1&n=2011EO40&oc=500&y0=2025&m0=8&d0=23&h0=0&mi0=0&y1=2025&m1=9&d1=30&h1=0&mi1=0&ti=1.0&tiu=days. Retrieved 2014-07-04. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:2011_EO40&oldid=4343062"