(523794) 2015 RR245
(523794) 2015 RR245, provisional designation 2015 RR245, is a large trans-Neptunian object of the Kuiper belt in the outermost regions of the Solar System. It was discovered on 9 September 2015, by the Outer Solar System Origins Survey at Mauna Kea Observatories on the Big island of Hawaii, in the United States. The object is in a rare 2:9 resonance with Neptune and measures approximately 600 kilometers in diameter. 2015 RR245 was suspected to have a satellite according to a study announced by Noyelles et al. in a European Planetary Science Congress meeting in 2019.
2015 RR245 imaged by the Hubble Space Telescope in October 2020 | |
| Discovery | |
|---|---|
| Discovered by | OSSOS Michele T. Bannister et al. |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 9 September 2015 |
| Designations | |
MPC designation | (523794) 2015 RR245 |
Minor planet category | TNO · SDO · resonant (2:9) p-DP · distant |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 13.10 yr (4,786 d) |
| Earliest precovery date | 15 October 2004 |
| Aphelion | 128.80 AU |
| Perihelion | 33.943 AU |
Semi-major axis | 81.373 AU |
| Eccentricity | 0.5829 |
Orbital period (sidereal) | 734.05 yr (268,113 d) |
Mean anomaly | 323.86° |
Mean motion | 0° 0m 4.68s / day |
| Inclination | 7.5755° |
Longitude of ascending node | 211.68° |
| ≈ 21 August 2092 ±3 days | |
| 261.02° | |
| Physical characteristics | |
Mean diameter | ≈500 km ≈630 km 500–870 km assuming a single object |
| 0.12 (assumed) 0.11 (assumed) 0.135 (assumed) | |
| neutral G–R=0.59±0.11 | |
| 21.2 (perihelic) | |
| 3.6±0.1 (Hr) 4.01 4.1 | |
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