2015 KG163, also known as o5m52, is a trans-Neptunian object from the outermost region of the Solar System, approximately 102 kilometers (63 miles) in diameter. It was first observed on 24 May 2015, by astronomers of the Outer Solar System Origins Survey using the Canada–France–Hawaii Telescope at Mauna Kea Observatories, Hawaii, United States.[6] With an observation arc of 2 years, it is known that it will come to perihelion around August 2022[4][lower-alpha 1] at a velocity of 6.5 km/s with respect to the Sun.
![]() The orbit of 2015 KG163 (right side, in orange) and other extreme detached objects, along with the hypothetical Planet Nine's orbit on the right | |
Discovery[1] | |
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Discovered by | OSSOS |
Discovery site | Mauna Kea Obs. (first observed only) |
Discovery date | 24 May 2015 |
Designations | |
MPC designation | 2015 KG163 |
Alternative designations | o5m52[2] |
Minor planet category | TNO[1] · E-SDO sednoid[3] · detached |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 3 | |
Observation arc | 2.02 yr (739 days) |
Earliest precovery date | 17 May 2015 |
Aphelion | 1319.17 AU 1320 AU (barycentric) |
Perihelion | 40.493 AU |
Semi-major axis | 679.83 AU |
Eccentricity | 0.9404 |
Orbital period (sidereal) | 17714 yr (6,470,077 d) 17700 yr (barycentric) |
Mean anomaly | 359.93° |
Mean motion | 0° 0m 0s / day |
Inclination | 13.994° |
Longitude of ascending node | 219.10° |
Time of perihelion | ≈ 12 August 2022[4] ±2 months[lower-alpha 1] |
Argument of perihelion | 32.097° |
Physical characteristics | |
Dimensions | 101 km (Johnston)[3] 104 km (Brown)[5] |
Geometric albedo | 0.08 (estimate)[5] |
Absolute magnitude (H) | 8.265[1] |
It is one a small number of detached objects with perihelion distances of 30 AU or more, and semi-major axes of 250 AU or more.[7] Such objects can not reach such orbits without some perturbing object, which lead to the speculation of Planet Nine. Its argument of perihelion is similar to that of 2013 FT28.
Trans-Neptunian objects | |
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TNO classes |
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Dwarf planets (moons) | |
Sednoids |
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Other |
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