2021 RR205

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2021 RR205
Discovery [1]
Discovered by S. S. Sheppard
D. J. Tholen
C. Trujillo
Discovery site Mauna Kea Obs.
Discovery date5 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 5.11 yr (1,867 days)
Earliest precovery date24 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 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). [4] Its large orbital semi-major axis (~1,000 AU) suggests it is potentially from the inner Oort cloud. [6] [7] 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 of this gap weakly experience "diffusion", or inward orbital migration due to minuscule perturbations by Neptune. [6] While Sheppard considers 2021 RR205 a sednoid, researchers Yukun Huang and Brett Gladman do not. [8]

    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. [3] 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 3 "2021 RR205". Minor Planet Center. International Astronomical Union. Retrieved 21 September 2022.
    4. 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)
    5. ↑ "Asteroid Size Estimator". Center for Near Earth Object Studies. Jet Propulsion Laboratory. Retrieved 21 September 2022.
    6. 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.
    7. ↑ Sheppard, Scott S. "Scott Sheppard Small Body Discoveries". Earth and Planets Laboratory. Carnegie Institution for Science. Retrieved 10 October 2022.
    8. ↑ Huang, Yukun; Gladman, Brett (February 2024). "Primordial Orbital Alignment of Sednoids". The Astrophysical Journal Letters. 962 (2): 6. arXiv: 2310.20614 . Bibcode:2024ApJ...962L..33H. doi: 10.3847/2041-8213/ad2686 . L33.
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