 | |
| Discovery[1] | |
|---|---|
| Discovered by | S. S. Sheppard D. J. Tholen C. Trujillo |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 5 September 2021 |
| Designations | |
| 2021 RR205 | |
| TNO[2] · detached · distant[3] | |
| Orbital characteristics (barycentric)[4] | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Uncertainty parameter 3[2] | |
| Observation arc | 5.11yr (1,867 days) |
| Earliestprecovery 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 | |
| 100–300 km(est. 0.04–0.2)[5] | |
| 24.6[1] | |
| 6.77±0.11[2] · 6.74[3] | |
2021 RR205 is anextreme trans-Neptunian object discovered by astronomersScott Sheppard,David Tholen, andChad Trujillo with theSubaru Telescope atMauna Kea Observatory on 5 September 2021. It resides beyond the outer extent of theKuiper belt on a distant and highly eccentric orbitdetached fromNeptune'sgravitational influence, with a largeperihelion distance of 55.5astronomical units (AU).[4] Its large orbitalsemi-major axis (~1,000 AU) suggests it is potentially from the innerOort cloud.[6][7]2021 RR205 and2013 SY99 both lie in the50–75 AU perihelion gap that separates the detached objects from the more distantsednoids; dynamical studies indicate that such objects in the inner edge of this gap weakly experience "diffusion", or inwardorbital migration due to minuscule perturbations by Neptune.[6] While Sheppard considers2021 RR205 a sednoid, researchers Yukun Huang andBrett Gladman do not.[8]
2021 RR205's heliocentric distance was60 AU when it was discovered.[2] It has been detected inprecovery observations by theDark Energy Survey atCerro Tololo Observatory from as early as July 2017.[3] It last passed perihelion in the early 1990s and is now moving outbound from the Sun.[1]
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