2013 SK100

2013 SK100
DiscoveryMPO 420416
Discovered by

first observed by:
Mauna Kea


Discovery date 29 September 2013
Designations
MPC designation 2013 SK100
distant[1] · TNO[2] · cubewano · detached
Orbital characteristics [2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 3
Observation arc 4.07 yr (1487 days)
Aphelion 78.103 AU
Perihelion 45.478 AU
61.790 AU
Eccentricity 0.264
486 yr (177,390 days)
355.081°
0° 0m 7.2s / day
Inclination 26.312°
17.10°
11.14°
Physical characteristics
Dimensions 100 km[1]
24.1[3]
7.6[1]

    2013 SK100 is a trans-Neptunian object, located in the scattered disc, the outermost region of the Solar System.[4] It orbits the Sun in a moderate inclined, moderate-eccentricity orbit. The object was discovered in September 2013.

    Discovery and naming

    2013 SK100 was discovered on 29 September 2013. It was discovered at Mauna Kea.

    Orbit

    Considered a detached object,[5][6] 2013 SK100 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.[7]. It is in a 3:1 resonance to Neptune. It seems to belong to the same group as (145480) 2005 TB190.

    Size

    2013 SK100 has a diameter estimated at around 100 kilometres (62 mi), roughly a fifth the size of (145480) 2005 TB190 which is estimated at around 500 kilometres (310 mi), roughly a quarter the size of Pluto, and it orbits between 45 and 80 AU from the Sun.

    References

    1. 1 2 3 "2013 SK100". Minor Planet Center. Retrieved 2018-10-09.
    2. 1 2 "JPL Small-Body Database Browser: 2013 SK100" (2015-01-24 last obs.). Jet Propulsion Laboratory. Retrieved 28 February 2017.
    3. ↑ "AstDys 2013 FQ28 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2018-10-12.
    4. ↑ Scott. S. Sheppard; Chadwick Trujillo; David J. Tholen (2015). "Beyond the Kuiper Belt Edge: New High Perihelion Trans-Neptunian Objects With Moderate Semi-major Axes and Eccentricities". The Astrophysical Journal Letters. 825/1: L13. arXiv:1606.02294. Bibcode:2006ApJ...640L..83A. doi:10.3847/2041-8205. (Discovery paper)
    5. ↑ Jewitt, David, Morbidelli, Alessandro, & Rauer, Heike. (2007). Trans-Neptunian Objects and Comets: Saas-Fee Advanced Course 35. Swiss Society for Astrophysics and Astronomy. Berlin: Springer. ISBN 3-540-71957-1.
    6. ↑ Lykawka, Patryk Sofia & Mukai, Tadashi. (2007). Dynamical classification of trans-neptunian objects: Probing their origin, evolution, and interrelation. Icarus Volume 189, Issue 1, July, Pages 213–232. doi:10.1016/j.icarus.2007.01.001.
    7. ↑ R. L. Allen; B. Gladman (2006). "Discovery of a low-eccentricity, high-inclination Kuiper belt object at 58 AU". The Astrophysical Journal. 640: L83. arXiv:astro-ph/0512430. Bibcode:2006ApJ...640L..83A. doi:10.1086/503098. (Discovery paper)

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