2003 SS422
{{DISPLAYTITLE:{{mp|2003 SS|422}}}}
{{Use dmy dates|date=October 2017}}
{{Infobox planet
| minorplanet = yes
| name = {{mp|2003 SS|422}}
| background = #C2E0FF
| image =
| image_size =
| caption =
| discoverer = Cerro Tololo Obs.
| discovery_site = Cerro Tololo Obs.
| discovered = 28 September 2003
| mpc_name = {{mp|2003 SS|422}}
| alt_names =
| pronounced =
| named_after =
| mp_category = TNO{{·}}extreme
1:16 Resonant
distant
| epoch = 5 July 2021 (JD 2459400.5)
| observation_arc = 14.92 yr (5,448 days)
| aphelion = 356.788 AU
| perihelion = 39.574 AU
| semimajor = 198.181 AU
| eccentricity = 0.8003140
| period = 2790 yr
| mean_anomaly = 1.770°
| mean_motion = {{Deg2DMS|0.00035327|sup=ms}} / day
| inclination = 16.773°
| asc_node = 150.949°
| arg_peri = 206.824°
| mean_diameter = {{val|163|ul=km}} {{small|(est. at 0.09)}}
| rotation =
| albedo =
| spectral_type =
}}
{{mp|2003 SS|422}} 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 {{convert|168|km|mi|abbr=off|sp=us}} in diameter.
Due to the object's high eccentricity and large perihelia, {{mp|2003 SS|422}} is an extreme trans-Neptunian object from the scattered disc (ESDO). It was a lost minor planet until it was recovered in June 2021.
Orbit and classification
Based on an observation arc of 14.9 years with 26 observations in total, {{mp|2003 SS|422}} 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.
{{As of|2021}}, {{mp|2003 SS|422}} 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, 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.
A study on dynamical classification of trans-Neptunian objects in 2024 identified {{mp|2003 SS|422}} as most likely in a 1:16 resonance with Neptune, in which the object completes a single orbit for every 16 Neptune makes.{{cite arXiv |last1=Volk |first1=Kathryn |last2=Malhotra |first2=Renu |title=Machine Learning Assisted Dynamical Classification of Trans-Neptunian Objects |date=2024 |class=astro-ph.EP |eprint=2405.05185}}
References
{{reflist|refs=
|type = 2020-11-18 last obs.
|title = JPL Small-Body Database Browser: (2003 SS422)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3385835
|publisher = Jet Propulsion Laboratory
|accessdate = 5 March 2021}}
|title = 2003 SS422
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2003+SS422
|accessdate = 5 March 2021}}
|title = List of Known Trans-Neptunian Objects
|work = Johnston's Archive
|date = 18 August 2020
|author = Johnston, Wm. Robert
|url = http://www.johnstonsarchive.net/astro/tnoslist.html
|accessdate = 5 March 2021}}
|title = Query (search criteria): objects perihelion min. 38 AU and semimajor axis min. 150 AU (found: 25 objects)
|work = Minor Planet Center
|url = https://minorplanetcenter.net//db_search/show_by_properties?perihelion_distance_min=38&semimajor_axis_min=150
|accessdate = 5 March 2021}}
|title = MPEC 2021-M14 : 2003 SS422
|url = https://minorplanetcenter.net/mpec/K21/K21M14.html
|work = Minor Planet Center
|date = 16 June 2021
|accessdate = 16 June 2021}}
}}
External links
- [https://minorplanetcenter.net/iau/lists/TNOs.html List Of Transneptunian Objects], Minor Planet Center
- [http://www.johnstonsarchive.net/astro/tnoslist.html List of Known Trans-Neptunian Objects], Johnston's Archive
- {{JPL small body}}
{{Trans-Neptunian objects}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:2003 SS422}}