2021 Rr205
2021 RR205 is an extreme trans-Neptunian object discovered by astronomers Scott Sheppard, David Tholen, and Chad Trujillo with the Subaru Telescope at Mauna Kea Observatory on 5 September 2021.
It resides beyond the outer extent of the Kuiper belt on a distant and highly eccentric orbit detached from Neptune's gravitational influence, with a large perihelion distance of 55.5 astronomical units (AU). Its large orbital semi-major axis (~1,000 AU) suggests it is potentially from the inner Oort cloud. 2021 RR205 and 2013 SY99 both lie in the 50–75 AU perihelion gap that separates the detached objects from the more distant sednoids; dynamical studies indicate that such objects in the inner edge this gap weakly experience "diffusion", or inward orbital migration due to minuscule perturbations by Neptune. While Sheppard considers 2021 RR205 a sednoid, researchers Yukun Huang and Brett Gladman do not.
| Discovery | |
|---|---|
| Discovered by | S. S. Sheppard D. J. Tholen C. Trujillo |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 5 September 2021 |
| Designations | |
| 2021 RR205 | |
| TNO · detached · distant | |
| Orbital characteristics (barycentric) | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 5.11 yr (1,867 days) |
| Earliest precovery date | 24 July 2017 |
| Aphelion | 1926 AU |
| Perihelion | 55.541 AU |
| 990.9 AU | |
| Eccentricity | 0.94395 |
| 31173 yr | |
| 0.363° | |
| 0° 0m 0.114s / day | |
| Inclination | 7.644° |
| 108.345° | |
| 208.574° | |
| Physical characteristics | |
Mean diameter | 100–300 km (est. 0.04–0.2) |
| 24.6 | |
| 6.77±0.11 · 6.74 | |
2021 RR205's heliocentric distance was 60 AU when it was discovered. It has been detected in precovery observations by the Dark Energy Survey at Cerro Tololo Observatory from as early as July 2017. It last passed perihelion in the early 1990s and is now moving outbound from the Sun.
References
External links
- 2021 RR205 at AstDyS-2, Asteroids—Dynamic Site
- 2021 RR205 at the JPL Small-Body Database
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