2015 KQ174

2015 KQ174
DiscoveryMPEC 2018-T49
Discovered by first observed by:
Mauna Kea
Discovery date 24 May 2015
Designations
MPC designation 2015 KQ174
distant[1] · TNO[2] · cubewano · detached
Orbital characteristics [2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 3
Observation arc 3.24 yr (1,183 days)
Aphelion 61.477 AU
Perihelion 49.313 AU
55.395 AU
Eccentricity 0.110
412 yr (150,380 days)
76.75°
0° 0m 8.64s / day
Inclination 24.343°
213.92°
294.04°
Physical characteristics
Dimensions 100–150 km[3]
25.01[4]
7.3[1]

    2015 KQ174 is a trans-Neptunian object, located in the scattered disc, the outermost region of the Solar System.[3] It orbits the Sun in a moderate inclined, moderate-eccentricity orbit. The object was discovered in May 2015.

    Discovery and naming

    2015 KQ174 was discovered on 24 May 2015. It was discovered at Mauna Kea.

    Orbit

    Considered a detached object,[5][6] 2015 KQ174 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 5:2 resonance to Neptune. It seems to belong to the same group as 2004 XR190.

    Size

    2015 KQ174 has a diameter estimated at around 150 kilometres (93 mi), roughly a quarter the size of 2004 XR190 which is estimated at around 500 kilometres (310 mi), roughly a quarter the size of Pluto, and it orbits between 49 and 62 AU from the Sun.

    References

    1. 1 2 "2015 KQ174". Minor Planet Center. Retrieved 2018-10-09.
    2. 1 2 "JPL Small-Body Database Browser: 2015 KQ174" (2015-01-24 last obs.). Jet Propulsion Laboratory. Retrieved 28 February 2017.
    3. 1 2 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)
    4. ↑ "AstDys 2015 KQ174 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2018-10-09.
    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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