Astronomy:2003 SS422
| Discovery[1] | |
|---|---|
| Discovered by | Cerro Tololo Obs. |
| Discovery site | Cerro Tololo Obs. |
| Discovery date | 28 September 2003 |
| Designations | |
| 2003 SS422 | |
| Minor planet category | TNO[2] · extreme[3] distant[1] |
| Orbital characteristics[4] | |
| Epoch 5 July 2021 (JD 2459400.5) | |
| Uncertainty parameter 3[2] | |
| Observation arc | 14.92 yr (5,448 days) |
| |{{{apsis}}}|helion}} | 356.788 AU |
| |{{{apsis}}}|helion}} | 39.574 AU |
| 198.181 AU | |
| Eccentricity | 0.8003140 |
| Orbital period | 2790 yr |
| Mean anomaly | 1.770° |
| Mean motion | 0° 0m 1.272s / day |
| Inclination | 16.773° |
| Longitude of ascending node | 150.949° |
| 206.824° | |
| Physical characteristics | |
| Mean diameter | 163 km (est. at 0.09)[3] |
| Absolute magnitude (H) | 7.04[4] |
2003 SS422 is a trans-Neptunian object located in the outermost region of the Solar System. It was discovered on 28 September 2003, by American astronomers at the Cerro Tololo Observatory in La Serena, Chile, and estimated to measure approximately 168 kilometers (104 miles) in diameter.[1][3]
Due to the object's high eccentricity and large perihelia, 2003 SS422 is an extreme trans-Neptunian object from the scattered disc (ESDO).[3] It was a lost minor planet until it was recovered in June 2021.[4]
Orbit and classification
Based on an observation arc of 14.9 years with 26 observations in total, 2003 SS422 orbits the Sun at a distance of 39.6–356.8 AU once every 2790 years (1,019,048 days; semi-major axis of 198.2 AU). Its orbit has an eccentricity of 0.80 and an inclination of 17° with respect to the ecliptic.[2]
(As of 2021), 2003 SS422 belongs to a small number of 21 high-eccentricity and large-perihelia objects (q > 38 AU) with a semi-major axis of larger than 150 AU,[5] which are the defining orbital parameters of the group of extreme scattered disc object, or ESDO. It is thought that objects cannot reach such orbits without some perturbing object outside the eight planets, which has led to the speculation of Planet Nine.
References
- ↑ 1.0 1.1 1.2 "2003 SS422". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2003+SS422. Retrieved 5 March 2021.
- ↑ 2.0 2.1 2.2 "JPL Small-Body Database Browser: (2003 SS422)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3385835. Retrieved 5 March 2021.
- ↑ 3.0 3.1 3.2 3.3 Johnston, Wm. Robert (18 August 2020). "List of Known Trans-Neptunian Objects". Johnston's Archive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 5 March 2021.
- ↑ 4.0 4.1 4.2 "MPEC 2021-M14 : 2003 SS422". Minor Planet Center. 16 June 2021. https://minorplanetcenter.net/mpec/K21/K21M14.html. Retrieved 16 June 2021.
- ↑ "Query (search criteria): objects perihelion min. 38 AU and semimajor axis min. 150 AU (found: 25 objects)". Minor Planet Center. https://minorplanetcenter.net//db_search/show_by_properties?perihelion_distance_min=38&semimajor_axis_min=150. Retrieved 5 March 2021.
External links
- List Of Transneptunian Objects, Minor Planet Center
- List of Known Trans-Neptunian Objects, Johnston's Archive
- 2003 SS422 at the JPL Small-Body Database
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