2015 KH163

2015 KH163, is a trans-Neptunian- and scattered disc object from the outermost region of the Solar System, approximately 117 kilometers in diameter. It was first observed by astronomers during the Outer Solar System Origins Survey at the Mauna Kea Observatories on 24 May 2015.[1][2][5]

2015 KH163
Discovery[1][2]
Discovered byOSSOS
Discovery siteMauna Kea Obs.
Discovery date24 May 2015
Designations
2015 KH163
o5m85[3]
TNO[4] · SDO[5]
distant[1] · detached
Orbital characteristics[4]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc2.97 yr (1,085 days)
Aphelion273.00 AU
Perihelion40.068 AU
156.53 AU
Eccentricity0.7440
1958.49 yr (715,337 days)
353.15°
0° 0m 1.8s / day
Inclination27.079°
67.593°
230.29°
Physical characteristics
Dimensions117 km (calculated)[5]
0.09 (assumed)[5]
7.9483[4]

    Description

    This minor planet is one of a small number of detached objects with perihelion distances of 30 AU or more, and semi-major axes of 200 AU or more.[6] Such objects can not reach such orbits without some perturbing object, which lead to the speculation of planet nine.

    Based on an absolute magnitude of approximately 7.95 and an assumed albedo of 0.09, the Johnston's Archive calculated a mean-diameter of 117 kilometers.[5]

    2015 KH163 is located very near the 1:12 Neptune resonance of 157.8 AU (compared to its 157.2 ± 0.6 AU), meaning that it completes roughly 1 orbit for every 12 orbits Neptune makes.

    References
    1. "2015 KH163". Minor Planet Center. Retrieved 14 October 2017.
    2. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 14 October 2017.
    3. Shankman, Cory; et al. (2017). "OSSOS. VI. Striking Biases in the Detection of Large Semimajor Axis Trans-Neptunian Objects". The Astronomical Journal. 154 (2): 50. arXiv:1706.05348. Bibcode:2017AJ....154...50S. doi:10.3847/1538-3881/aa7aed. hdl:10150/625487. S2CID 3535702.
    4. "JPL Small-Body Database Browser: (2015 KH163)" (2017-05-21 last obs.). Jet Propulsion Laboratory. Retrieved 14 October 2017.
    5. "List of known Trans-Neptunian Objects". Johnston's Archive. Retrieved 14 October 2017.
    6. minorplanetcenter.net: q>30, a>150


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