2011 EO40 is an asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group. It is a possible candidate for the parent body of the Chelyabinsk superbolide.
|Discovered by||Richard A. Kowalski|
(Mount Lemmon Survey)
|Discovery date||March 10, 2011|
|MPC designation||2011 EO40|
|Apollo NEO PHA,|
|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)|
|2.13 yr (777.10 d)|
|0° 27m 47.736s /day|
|Earth MOID||0.0482051 AU (7.21138 Gm)|
|Jupiter MOID||2.79322 AU (417.860 Gm)|
Discovery, orbit and physical propertiesEdit
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. 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. 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. 2011 EO40 has an absolute magnitude of 21.5, which gives a characteristic diameter of about 200 metres (660 ft).
Relationship to the Chelyabinsk superbolideEdit
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. 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), 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). 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.
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. Depending on the Earth approach distance (0.04–0.12 AU), it should be brighter than magnitude 19.
- ^ This is assuming an albedo of 0.20–0.04.
- Discovery MPEC
- List Of Apollo Minor Planets
- "JPL Small-Body Database Browser: (2011 EO40)". Jet Propulsion Laboratory. Retrieved 31 March 2016.
- "List Of The Potentially Hazardous Asteroids (PHAs)". Minorplanetcenter.net. Retrieved 27 June 2014.
- NEODyS-2 on 2011 EO40 Retrieved 2013-07-31
- Absolute-magnitude conversion table (H)
- 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.
- 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.
- 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.
- MPC data on 2011 EO40
- "Observations of small Solar-System bodies". hohmanntransfer. 11 March 2011. Retrieved 6 August 2013. (2.7e-07 = 1 in 3,704,000 chance)
- "2011EO40 Ephemerides for 23 August 2025 through 30 September 2025". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 4 July 2014.
- 2011 EO40 data at MPC
- MPEC 2011-E59 : 2011 EO40 (Discovery MPEC)
- Russian meteor may have gangmates in tow, Nature, short article
- Has the Chelyabinsk Meteor Parent Asteroid Been Found?, Bad Astronomy blog entry
- 2011 EO40 at the JPL Small-Body Database