(181902) 1999 RD215
(181902) 1999 RD215 is a trans-Neptunian object of the scattered disc, approximately 148 kilometers in diameter. It was discovered on 6 September 1999, by American astronomers Chad Trujillo, Jane Luu, and David Jewitt at the Mauna Kea Observatories, Hawaii.
| Discovery | |
|---|---|
| Discovered by | C. Trujillo J. X. Luu D. C. Jewitt |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 6 September 1999 |
| Designations | |
MPC designation | (181902) 1999 RD215 |
Alternative designations | 1999 RD215 |
Minor planet category | TNO · SDO · distant |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 3 · 1 | |
| Observation arc | 8.03 yr (2,933 days) |
| Aphelion | 204.40 AU |
| Perihelion | 37.541 AU |
Semi-major axis | 120.97 AU |
| Eccentricity | 0.6897 |
Orbital period (sidereal) | 1330.58 yr (485,993 d) |
Mean anomaly | 7.8003° |
Mean motion | 0° 0m 2.52s / day |
| Inclination | 25.990° |
Longitude of ascending node | 210.32° |
| 137.86° | |
| Physical characteristics | |
Mean diameter | 147 km 148 km |
| 0.08 (estimate) 0.09 (estimate) | |
| 7.4 · 7.6 | |
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