2005 RH52
| Discovery[1][2][3] | |
|---|---|
| Discovered by | (first observed only) CFEPS |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 3 September 2005 |
| Designations | |
| 2005 RH52 | |
| TNO[4] · ESDO[5] ETNO · distant[1] | |
| Orbital characteristics[4] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 12.30 yr (4,491 d) |
| Aphelion | 270.41 AU |
| Perihelion | 38.956 AU |
| 154.68 AU | |
| Eccentricity | 0.7482 |
| 1924 yr (702,689 d) | |
| 2.9912° | |
| 0° 0m 1.8s / day | |
| Inclination | 20.428° |
| 306.01° | |
| 32.366° | |
| Neptune MOID | 10.2 AU[1] |
| Physical characteristics | |
| 128 km (est.)[5] 130 km (est.)[6] | |
| 0.08 (assumed)[6] 0.09 (assumed)[5] | |
| 7.7[1][4] | |
2005 RH52 is an extreme trans-Neptunian object from the extended scattered disc in the outermost region of the Solar System, approximately 130 kilometers (81 miles) in diameter. It was first observed on 3 September 2005, by astronomers with the Canada–France Ecliptic Plane Survey using the Canada–France–Hawaii Telescope at the Mauna Kea Observatories in Hawaii, United States.[1][2][3]
The detached, extended scattered disc object (ESDO) is on a highly eccentric orbit and belongs to the extreme trans-Neptunian objects.
Orbit and classification
[edit]2005 RH52 belongs to a small group of detached objects with perihelion distances of 30 AU or more, and semi-major axes of 150 AU or more.[7] Such extreme trans-Neptunian objects (ETNOs) can not reach such orbits without some perturbing object, which lead to the speculation of Planet Nine.
It orbits the Sun at a distance of 39–270 AU once every 1923 years and 10 months (702,689 days; semi-major axis of 154.68 AU). Its orbit has an eccentricity of 0.75 and an inclination of 20° with respect to the ecliptic.[4] The body's observation arc begins with its first official observation at Mauna Kea in September 2005.[1]
Numbering and naming
[edit]As of 2018, this minor planet has neither been numbered nor named by the Minor Planet Center. The official discoverer(s) will be defined when the object is numbered.[1]
Physical characteristics
[edit]According to the Johnston's archive and to American astronomer Michael Brown, 2005 RH52 measures 128 and 130 kilometers in diameter based on an assumed albedo of 0.09 and 0.08, respectively.[5][6] Due to its small size, it is listed as "probably not" a dwarf planet (100–200 km) on Michael Brown's website, which uses a 5-class taxonomic system that ranges from "nearly certainly" to "possibly" for potential dwarf planet candidates.[6] As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[4][8]
See also
[edit]References
[edit]- ^ a b c d e f g "2005 RH52". Minor Planet Center. Retrieved 25 October 2018.
- ^ a b "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 25 October 2018.
- ^ a b Gladman, B.; Kavelaars, J.; Allen, L.; Petit, J.-M.; Vanlaerhoven, C.; Jones, L.; et al. (27 July 2011). "Eleven New Tnos". Minor Planet Electronic Circ. 2011-O40 (2011–O40). Bibcode:2011MPEC....O...40G. Retrieved 25 October 2018.
- ^ a b c d e "JPL Small-Body Database Browser: (2005 RH52)" (2017-12-20 last obs.). Jet Propulsion Laboratory. Retrieved 25 October 2018.
- ^ a b c d "List of Known Trans-Neptunian Objects". Johnston's Archive. 7 October 2018. Retrieved 25 October 2018.
- ^ a b c d Brown, Michael E. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 25 October 2018.
- ^ "Database Query: objects q>30, a>150". Minor Planet Center. Retrieved 25 October 2018.
- ^ "LCDB Data for (2005+RH52)". Asteroid Lightcurve Database (LCDB). Retrieved 25 October 2018.
External links
[edit]- 2005 RH52 at AstDyS-2, Asteroids—Dynamic Site
- 2005 RH52 at the JPL Small-Body Database
