Astronomy:2011 EO40

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Short description: Asteroid


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 9 August 2022 (JD 2459800.5)
Uncertainty parameter 6
|{{{apsis}}}|helion}}2.5467 astronomical unit|AU (380.98 Gm)
|{{{apsis}}}|helion}}0.76039 AU (113.753 Gm)
1.65356 AU (247.369 Gm)
Eccentricity0.54015
Orbital period2.1264 yr (776.66 d)
Mean anomaly169.9°
Mean motion0° 27m 47.736s / day
Inclination3.3591°
Longitude of ascending node50.249°
17.154°
Earth MOID0.0482051 AU (7.21138 Gm)
Jupiter MOID2.79322 AU (417.860 Gm)
Physical characteristics
Dimensions150–330 m[a][6]
Absolute magnitude (H)21.5[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 EarthMoon 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. 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.[12]

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 Absolute-magnitude conversion table (H)
  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. Bibcode2013MNRAS.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. Bibcode2014MNRAS.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. Bibcode2015ApJ...812...26D. 
  10. 10.0 10.1 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. "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. 

External links