Astronomy:2021 RR205
| 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 | |
| Minor planet category | TNO[2] · sednoid[3] · detached · distant[4] |
| Orbital characteristics[5] | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Uncertainty parameter 3[2] | |
| Observation arc | 5.11 yr (1,867 days) |
| Earliest precovery date | 24 July 2017 |
| |{{{apsis}}}|helion}} | 1926 astronomical unit|AU |
| |{{{apsis}}}|helion}} | 55.541 AU |
| 990.9 AU | |
| Eccentricity | 0.94395 |
| Orbital period | 31173 yr |
| Mean anomaly | 0.363° |
| Mean motion | 0° 0m 0.114s / day |
| Inclination | 7.644° |
| Longitude of ascending node | 108.345° |
| 208.574° | |
| Physical characteristics | |
| Mean diameter | 100–300 km (est. 0.04–0.2)[6] |
| Apparent magnitude | 24.6[1] |
| Absolute magnitude (H) | 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
- ↑ 1.0 1.1 1.2 "MPEC-2022-S118 : 2021 RR205". Minor Planet Electronic Circular. Minor Planet Center. 21 September 2022. https://minorplanetcenter.net/mpec/K22/K22SB8.html. Retrieved 21 September 2022.
- ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: (2021 RR205)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=54305639. Retrieved 21 September 2022.
- ↑ 3.0 3.1 Sheppard, Scott S.. "Scott Sheppard Small Body Discoveries". Earth and Planets Laboratory. Carnegie Institution for Science. https://sites.google.com/carnegiescience.edu/sheppard/home/discoveries. Retrieved 10 October 2022.
- ↑ 4.0 4.1 4.2 "2021 RR205". Minor Planet Center. International Astronomical Union. https://www.minorplanetcenter.net/db_search/show_object?object_id=2021+RR205. Retrieved 21 September 2022.
- ↑ 5.0 5.1 "JPL Horizons On-Line Ephemeris for 2021 RR205 at epoch JD 2460000.5". JPL Horizons On-Line Ephemeris System. Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND='2021+RR205'&TABLE_TYPE='ELEMENTS'&START_TIME='JD2460000.5'&STOP_TIME='JD2460200.5'&STEP_SIZE='1y'&CENTER='@0'&OUT_UNITS='AU-D'. Retrieved 21 September 2022. Solution using the Solar System Barycenter. Ephemeris Type: Elements and Center: @0)
- ↑ "Asteroid Size Estimator". Center for Near Earth Object Studies. Jet Propulsion Laboratory. https://cneos.jpl.nasa.gov/tools/ast_size_est.html. Retrieved 21 September 2022.
- ↑ 7.0 7.1 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. doi:10.3847/1538-3881/aa6db5. Bibcode: 2017AJ....153..262B.
External links
- 2021 RR205 at AstDyS-2, Asteroids—Dynamic Site
- 2021 RR205 at the JPL Small-Body Database
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