2011 EO40

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2011 EO40
Discovery [1]
Discovered by Richard A. Kowalski
(Mount Lemmon Survey)
Discovery date10 March 2011
Designations
2011 EO40
Orbital characteristics [3] [5]
Epoch 9 August 2022 (JD  2459800.5)
Uncertainty parameter 6
Aphelion 2.5467  AU (380.98  Gm)
Perihelion 0.76039 AU (113.753 Gm)
1.65356 AU (247.369 Gm)
Eccentricity 0.54015
2.1264  yr (776.66  d)
169.9°
0° 27m 47.736s / day
Inclination 3.3591°
50.249°
17.154°
Earth  MOID 0.0482051 AU (7.21138 Gm)
Jupiter  MOID 2.79322 AU (417.860 Gm)
Physical characteristics
Dimensions150–330 m [a] [6]
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]

    Contents

    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  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

    Related Research Articles

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    References

    1. 1 2 Discovery MPEC
    2. List Of Apollo Minor Planets
    3. 1 2 3 4 5 6 7 8 9 "JPL Small-Body Database Browser: (2011 EO40)". Jet Propulsion Laboratory . Retrieved 2 August 2022.
    4. "List Of The Potentially Hazardous Asteroids (PHAs)". Minorplanetcenter.net. Retrieved 27 June 2014.
    5. NEODyS-2 on 2011 EO40 Retrieved 2013-07-31
    6. 1 2 Absolute-magnitude conversion table (H)
    7. 1 2 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. arXiv: 1307.7918 . Bibcode:2013MNRAS.436L..15D. doi: 10.1093/mnrasl/slt103 .
    8. 1 2 3 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. arXiv: 1405.7202 . Bibcode:2014MNRAS.443L..39D. doi: 10.1093/mnrasl/slu078 .
    9. 1 2 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). arXiv: 1508.05907 . Bibcode:2015ApJ...812...26D. doi:10.1088/0004-637X/812/1/26.
    10. 1 2 MPC data on 2011 EO40
    11. "Observations of small Solar-System bodies". hohmanntransfer. 11 March 2011. Archived from the original on 23 November 2020. Retrieved 6 August 2013. (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). Retrieved 4 July 2014.