2013 SK100
{{DISPLAYTITLE: {{mp|2013 SK|100}}}}
{{Use dmy dates|date=December 2018}}
{{Infobox planet
| minorplanet = yes
| name = {{mp|2013 SK|100}}
| background = #C2E0FF
| image =
| image_size =
| caption =
| discoverer = Mauna Kea Obs.
| discovery_site = Mauna Kea Obs.
{{small|(first observed only)}}
| discovered = 29 September 2013
| mpc_name = {{mp|2013 SK|100}}
| alt_names =
| pronounced =
| named_after =
| mp_category = {{Hlist
| TNO
| detached
| SDO
| distant
}}
| epoch = 27 April 2019 (JD 2458600.5)
| uncertainty = 4
| observation_arc = 4.07 yr (1,487 d)
| aphelion = 78.109 AU
| perihelion = 45.477 AU
| semimajor = 61.793 AU
| eccentricity = 0.2640
| period = 485.75 yr (177,421 d)
| mean_anomaly = 355.07°
| mean_motion = {{Deg2DMS|0.0020|sup=ms}} / day
| inclination = 26.312°
| asc_node = 17.104°
| arg_peri = 11.163°
| mean_diameter = {{Ubl
}}
| rotation =
| albedo = {{Ubl
}}
| spectral_type =
}}
{{mp|2013 SK|100}} is a trans-Neptunian object, both considered a scattered and detached object, located in the outermost region of the Solar System. The object with a moderately inclined and eccentric orbit measures approximately {{convert|135|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was first observed on 29 September 2013, by astronomers at the Mauna Kea Observatories in Hawaii, United States.
Orbit and classification
{{mp|2013 SK|100}} orbits the Sun at a distance of 45.5–78.1 AU once every 485 years and 9 months (177,421 days; semi-major axis of 61.79 AU). Its orbit has an eccentricity of 0.26 and an inclination of 26° with respect to the ecliptic.
Considered both a scattered and detached object, {{mp|2013 SK|100}} is particularly unusual as it has an unusually circular orbit for a scattered-disc object (SDO). Although it is thought that traditional scattered-disc objects have been ejected into their current orbits by gravitational interactions with Neptune, the low eccentricity of its orbit and the distance of its perihelion (SDOs generally have highly eccentric orbits and perihelia less than 38 AU) seems hard to reconcile with such celestial mechanics. This has led to some uncertainty as to the current theoretical understanding of the outer Solar System. The theories include close stellar passages, unseen planet/rogue planets/planetary embryos in the early Kuiper belt, and resonance interaction with an outward-migrating Neptune. The Kozai mechanism is capable of transferring orbital eccentricity to a higher inclination. It is in a 3:1 resonance to Neptune. It seems to belong to the same group as {{mpl|(145480) 2005 TB|190}}.
Physical characteristics
Johnston's archive estimates a diameter of 134 kilometers based on an assumed albedo of 0.09, while American astronomer Michael Brown, calculates a diameter of 135 kilometers, using an estimated albedo of 0.08 and an absolute magnitude of 7.8.
References
{{reflist|30em|refs=
|type = 2017-08-30 last obs.
|title = JPL Small-Body Database Browser: (2013 SK100)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3787104
|publisher = Jet Propulsion Laboratory
|accessdate = 13 December 2018}}
|title = 2013 SK100
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2013+SK100
|accessdate = 13 December 2018}}
|title = List of Known Trans-Neptunian Objects
|work = Johnston's Archive
|date = 7 October 2018
|last = Johnston |first= Wm. Robert
|url = http://www.johnstonsarchive.net/astro/tnoslist.html
|accessdate = 12 December 2018}}
|title = How many dwarf planets are there in the outer solar system?
|publisher = California Institute of Technology
|last = Brown |first= Michael E.
|url = http://web.gps.caltech.edu/~mbrown/dps.html
|accessdate = 12 December 2018}}
|first1 = Patryk Sofia |last1 = Lykawka
|first2 = Tadashi |last2 = Mukai
|date = July 2007
|title = Dynamical classification of trans-neptunian objects: Probing their origin, evolution, and interrelation
|journal = Icarus
|volume = 189
|issue = 1
|pages = 213–232
|bibcode = 2007Icar..189..213L
|doi = 10.1016/j.icarus.2007.01.001
}}
|first1 = R. L. |last1 = Allen
|first2 = B. |last2 = Gladman
|first3 = J. J. |last3 = Kavelaars
|first4 = J.-M. |last4 = Petit
|first5 = J. W. |last5 = Parker
|first6 = P. |last6 = Nicholson
|date = March 2006
|title = Discovery of a Low-Eccentricity, High-Inclination Kuiper Belt Object at 58 AU
|journal = The Astrophysical Journal
|volume = 640
|issue = 1
|pages = L83–L86
|bibcode = 2006ApJ...640L..83A
|doi = 10.1086/503098
|arxiv = astro-ph/0512430
|s2cid = 15588453
}} (Discovery paper)
|title = 2013 SK100 – Ephemerides
|publisher = AstDyS-2, Asteroids{{Snd}} Dynamic Site, Department of Mathematics, University of Pisa, Italy
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.0&n=2013SK100
|accessdate = 12 December 2018}}
}}
External links
- [https://www.minorplanetcenter.net/iau/lists/t_centaurs.html List Of Centaurs and Scattered-Disk Objects], Minor Planet Center
- [http://www.johnstonsarchive.net/astro/tnoslist.html List of Known Trans-Neptunian Objects], Johnston's Archive
- {{AstDys|2013SK100}}
- {{JPL small body|id=3787104}}
{{Trans-Neptunian objects}}
{{Small Solar System bodies}}
{{DEFAULTSORT:2013 SK100}}