||This article has an unclear citation style. (January 2014)|
|Discovered by||Richard A. Kowalski
(Mount Lemmon Survey)
|Discovery date||March 10, 2011|
|MPC designation||2011 EO40|
|Minor planet category||Apollo NEO PHA,
|Epoch November 4, 2013 (JD 2456600.5)
|Semi-major axis||1.6540 AU|
|Orbital period||2.13 y (776.9 d)|
|Longitude of ascending node||50.311°|
|Argument of perihelion||17.061°|
|Absolute magnitude (H)||21.5|
Discovery, orbit and physical properties
2011 EO40 was discovered by Richard A. Kowalski on March 10, 2011 observing for the Mount Lemmon Survey. 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 November 1, 2013 it is based on just 20 observations spanning a data-arc of 34 days. 2011 EO40 has an absolute magnitude of 21.5 which gives a characteristic diameter of about 200 m.
Parent body of the Chelyabinsk superbolide?
Recent calculations indicate that this object is a plausible candidate to be the parent body of the Chelyabinsk superbolide; 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 the Earth on January 28, 2011 at 0.095 AU and it will have another close flyby with our planet on September 23, 2025 at 0.066 AU.
The object is currently (late October 2013) within 60 degrees of the Sun and it will remain that way until mid February, 2014. It will reach apparent visual magnitude 24.3 on June 16–22, 2014. Future best visibility windows: March 3–29, 2015 at 23.3 mag, June 6–8, 2016 at 24.5 mag, and April 5–28, 2017 at 22.7 mag. The best future window by far will be on September 2–23, 2025 at < 19.0 mag during the close encounter with the Earth-Moon system.
- ^ This is assuming an albedo of 0.20–0.04.
- Discovery MPEC
- List Of Apollo Minor Planets
- 2011 EO40 at the JPL Small-Body Database
- AstDys-2 on 2011 EO40 Retrieved 2013-07-31
- NEODyS-2 on 2011 EO40 Retrieved 2013-07-31
- Absolute-magnitude conversion table (H)
- de la Fuente Marcos, C.; de la Fuente Marcos, R. (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.
- MPC data on 2011 EO40
- "Observations of small Solar-System bodies". hohmanntransfer. 2011-03-11. Retrieved 2013-08-06. (2.7e-07 = 1 in 3,704,000 chance)
- JPL's Solar System Dynamics data on 2011 EO40
- Further reading
- The Chelyabinsk superbolide: a fragment of asteroid 2011 EO40? de la Fuente Marcos, C., & de la Fuente Marcos, R. 2013, Monthly Notices of the Royal Astronomical Society: Letters, Vol. 436, Issue 1, pp. L15-L19.
- 2011 EO40 data at MPC
- MPEC 2011-E59 : 2011 EO40 (Discovery MPEC)
- The Origin of the Russian Meteor Found, Physics Central short article
- Asteroid pinpointed as likely source of Russian meteor, New Scientist short article
- Russian meteor may have gangmates in tow, Nature short article