101955 Bennu
 | |
| Designations | |
|---|---|
| Apollo | |
| Orbital characteristics | |
| Aphelion | 1.356 AU |
| Perihelion | 0.897 AU |
| 1.126 AU | |
| Eccentricity | 0.204 |
| 436.604 d (1.20 a) | |
| 193.420° | |
| Inclination | 6.035° |
| 2.068° | |
| Physical characteristics | |
| Dimensions | ~560 m |
(101955) 1999 RQ36 is the minor planet designation of an Apollo asteroid discovered by LINEAR in 1999. It has a mean diameter of approximately 560 meters, and has been observed extensively with the Arecibo Observatory Planetary Radar and the Goldstone Deep Space Network.[2][3][4]
A recent dynamical study by Andrea Milani and collaborators has located a series of eight potential Earth impacts between 2169 and 2199. The cumulative probability of impact is dependent on poorly known physical properties of the object, but is not higher than 0.07% for all eight encounters.[5] To accurately assess RQ36's probability of Earth impact will require a detailed shape model of the asteroid and at least several more years of radar and optical observations to determine the magnitude of the Yarkovsky acceleration.
Separately, RQ36 has been considered multiple times as the target of spacecraft missions, including OSIRIS, due to the low delta-v required to reach it from Earth orbit.
References
- ^ "The Shape and Spin of 101955 (1999 RQ36) from Arecibo and Goldstone Radar Imaging".
- ^ a b "Goldstone Delay-Doppler Images of 1999 RQ36 work=Asteroid Radar Research". Jet Propulsion Laboratory.
{{cite web}}: Missing pipe in:|title=(help) - ^ Michael C. Nolan, Chris Magri, Lance Benner, et al., 2009, Radar observations of 1999 RQ36, in prep.
- ^ "Recent Delay-Doppler Radar Asteroid Modeling Results: 1999 RQ36 and Craters on Toutatis". Bulletin of the American Astronomical Society. 32. American Astronomical Society: 1001.
{{cite journal}}: Unknown parameter|authors=ignored (help) - ^ Long term impact risk for (101955) 1999 RQ36 - Andrea Milani, Steven R. Chesley, Maria Eugenia Sansaturio, Fabrizio Bernardi, Giovanni B. Valsecchi, Oscar Arratia. «ArXiv.org»
External links
- Impact risk and orbital information - JPL near-Earth object website
- Orbit parameters - NASA website
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