20461 Dioretsa
20461 Dioretsa /daɪ.əˈrɛtsə/ is a centaur and damocloid on a retrograde, cometary-like orbit from the outer Solar System. It was discovered on 8 June 1999, by members of the LINEAR team at the Lincoln Laboratory Experimental Test Site near Socorro, New Mexico, United States. The highly eccentric unusual object measures approximately 14 kilometers (8.7 miles) in diameter. It was named Dioretsa, the word "asteroid" spelled backwards.
| Discovery | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab ETS |
| Discovery date | 8 June 1999 |
| Designations | |
MPC designation | (20461) Dioretsa |
| Pronunciation | /daɪ.əˈrɛtsə/ |
Named after | Asteroid (spelled backwards) |
Alternative designations | 1999 LD31 |
Minor planet category | centaur · damocloid unusual · distant |
| Symbol | (astrological) |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 2.54 yr (927 d) |
| Aphelion | 45.404 AU |
| Perihelion | 2.4021 AU |
Semi-major axis | 23.903 AU |
| Eccentricity | 0.8995 |
Orbital period (sidereal) | 116.87 yr (42,686 d) |
Mean anomaly | 59.873° |
Mean motion | 0° 0m 30.24s / day |
| Inclination | 160.43° |
Longitude of ascending node | 297.77° |
| 103.13° | |
| Jupiter MOID | 0.1907 AU |
| TJupiter | -1.5470 |
| Physical characteristics | |
Mean diameter | 14±3 km |
| 0.03±0.01 | |
| 13.8 | |
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