2021 RR205
Discovery[1]
Discovered byS. S. Sheppard
D. J. Tholen
C. Trujillo
Discovery siteMauna Kea Obs.
Discovery date5 September 2021
Designations
2021 RR205
TNO[2] · sednoid[3] · detached · distant[4]
Orbital characteristics (barycentric)[5]
Epoch 25 February 2023 (JD 2460000.5)
Uncertainty parameter 3[2]
Observation arc5.11 yr (1,867 days)
Earliest precovery date24 July 2017
Aphelion1926 AU
Perihelion55.541 AU
990.9 AU
Eccentricity0.94395
31173 yr
0.363°
0° 0m 0.114s / day
Inclination7.644°
108.345°
208.574°
Physical characteristics
Mean diameter
100–300 km (est. 0.04–0.2)[6]
24.6[1]
6.77±0.11[2] · 6.74[4]

    2021 RR205 is an extreme trans-Neptunian object and sednoid 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).[5] Its large orbital semi-major axis (~1,000 AU) suggests it is potentially from the inner Oort cloud.[7][3] Like 2013 SY99, 2021 RR205 lies 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.[7]

    2021 RR205's heliocentric distance was 60 AU when it was discovered.[2] It has been detected in precovery observations by the Dark Energy Survey at Cerro Tololo Observatory from as early as July 2017.[4] It last passed perihelion in the early 1990s and is now moving outbound from the Sun.[1]

    References

    1. 1 2 3 "MPEC-2022-S118 : 2021 RR205". Minor Planet Electronic Circular. Minor Planet Center. 21 September 2022. Retrieved 21 September 2022.
    2. 1 2 3 4 "JPL Small-Body Database Browser: (2021 RR205)" (2022-09-03 last obs.). Jet Propulsion Laboratory. Retrieved 21 September 2022.
    3. 1 2 Sheppard, Scott S. "Scott Sheppard Small Body Discoveries". Earth and Planets Laboratory. Carnegie Institution for Science. Retrieved 10 October 2022.
    4. 1 2 3 "2021 RR205". Minor Planet Center. International Astronomical Union. Retrieved 21 September 2022.
    5. 1 2 "JPL Horizons On-Line Ephemeris for 2021 RR205 at epoch JD 2460000.5". JPL Horizons On-Line Ephemeris System. Jet Propulsion Laboratory. Retrieved 21 September 2022. Solution using the Solar System Barycenter. Ephemeris Type: Elements and Center: @0)
    6. ↑ "Asteroid Size Estimator". Center for Near Earth Object Studies. Jet Propulsion Laboratory. Retrieved 21 September 2022.
    7. 1 2 Bannister, Michele; Shankman, Cory; Volk, Katherine (2017). "OSSOS: V. Diffusion in the orbit of a high-perihelion distant Solar System object". The Astronomical Journal. 153 (6): 262. arXiv:1704.01952. Bibcode:2017AJ....153..262B. doi:10.3847/1538-3881/aa6db5. S2CID 3502267.
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