20461 Dioretsa
| Discovery [1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | MRO |
| Discovery date | 8 June 1999 |
| Designations | |
| MPC designation | 20461 Dioretsa |
| Pronunciation |
/daɪ.əˈrɛtsə/ dy-ə-RET-sə |
Named after |
Asteroid (spelled backwards)[2] |
| 1999 LD31 | |
| centaur[1] · damocloid | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 2.54 yr (927 days) |
| Aphelion | 45.213 AU (6.7638 Tm) |
| Perihelion | 2.4029 AU (359.47 Gm) |
| 23.808 AU (3.5616 Tm) | |
| Eccentricity | 0.89907 |
| 116.17 yr (42,430 days) | |
| 50.155° | |
| 0° 0m 30.544s / day | |
| Inclination | 160.41° |
| 297.30° | |
| 102.61° | |
| Jupiter MOID | 0.1742 AU |
| Jupiter Tisserand parameter | -1.546 |
| Physical characteristics | |
| Dimensions | 14±3 km[3] |
| 0.03±0.01[3] | |
| 13.8[1] | |
|
| |
20461 Dioretsa, provisional designation 1999 LD31, is a distant minor planet classified as centaur, with a highly eccentric and retrograde orbit, approximately 14 kilometers in diameter. It was discovered 8 June 1999, by members of the Lincoln Near-Earth Asteroid Research (LINEAR) team at the U.S. Magdalena Ridge Observatory in New Mexico.[3][4]
The centaur orbits the Sun at a distance of 2.4–45.2 AU once every 116 years and 2 months (42,430 days). Its orbit has an exceptional eccentricity of 0.90 and an outstanding inclination of 160° (greater than 90° means retrograde) with respect to the plane of the ecliptic. Its orbit has an uncertainty parameter value of currently 2.[1] Dioretsa's orbit is otherwise similar to that of a comet. This has led to speculation that Dioretsa was originally an object from the Oort cloud.
The minor planet's name "Dioretsa" is the word "asteroid" spelled backwards, and is the first numbered of currently more than 20 known minor planets with a retrograde motion in the Solar System.[2]
References
- 1 2 3 4 5 "JPL Small-Body Database Browser: 20461 Dioretsa (1999 LD31)" (2000-12-29 last obs.). Jet Propulsion Laboratory. Retrieved 12 April 2016.
- 1 2 Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (20461) Dioretsa, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 152. ISBN 978-3-540-34360-8. Retrieved April 2016.
- 1 2 3 Harris, Alan W.; Delbó, Marco; Binzel, Richard P.; Davies, John K.; Roberts, Julie; Tholen, David J.; et al. (October 2001). "Visible to Thermal-Infrared Spectrophotometry of a Possible Inactive Cometary Nucleus". Icarus 153 (2): 332–337. Bibcode:2001Icar..153..332H. doi:10.1006/icar.2001.6687. Retrieved April 2016.
- ↑ "20461 Dioretsa (1999 LD31)". Minor Planet Center. Retrieved April 2016.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (20001)-(25000) – Minor Planet Center
- 20461 Dioretsa at the JPL Small-Body Database
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