2015 GT50

2015 GT50, previously known as o5p060, is a trans-Neptunian object orbiting in the Kuiper belt of the outermost Solar System. It was first observed by the Outer Solar System Origins Survey using the Canada–France–Hawaii Telescope at Mauna Kea on 13 April 2015.

2015 GT50
The orbits of 2015 GT50 (bottom; orange) and other detached objects, along with the hypothetical Planet Nine's orbit (right; green)
Discovery
Discovered byOSSOS
Discovery siteMauna Kea Obs.
Discovery date13 April 2015
Designations
o5p060[1]
Detached object
Orbital characteristics
Epoch JDT 2458000.5
Observation arc824 days (2.26 yr)
Earliest precovery date20 February 2015
Aphelion631.89 AU
Perihelion38.45 AU
335.169 AU
Eccentricity0.885
6,140 years
Inclination8.779°
46.100°
129.236°
Physical characteristics
8.5

    Description

    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.[2] Such objects cannot reach such orbits without some perturbing object, which has led to the Planet Nine hypothesis, that a massive trans-Neptunian planet is the perturber. However 2015 GT50 is an interesting outlier of these trans-Neptunian objects that make one of the lines of evidence for Planet Nine. Unlike the others, the shape of whose orbits (longitudes of perihelion) either cluster in anti-alignment with the modeled orbit of Planet Nine or cluster in alignment with it, 2015 GT50's major axis is almost at a right angle to that of the putative planet. Konstantin Batygin of Caltech suggests that this is only a cosmetic disagreement with his and Mike Brown's predictions for the positions of these bodies. In fact, he notes that without having to change the putative orbit of Planet Nine, 2015 GT50 falls into one of the predicted resonant orbits. This, he notes, may be a coincidence.[3] This conclusion, however, is not unanimous, and others have instead suggested that the existence of a population of objects with orbital characteristics similar to those of 2015 GT50 may be at odds with the Planet Nine hypothesis.[4]

    Closeup of current position near perihelion, passing across the top side of this view

    References
    1. 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.
    2. "IAU Minor Planet Center".
    3. "Status Update (Part 1)".
    4. Shankman, C.; Kavelaars, J. J.; Bannister, M. T.; Gladman, B. J.; Lawler, S. M.; et al. (2017). "OSSOS. VI. Striking Biases in the Detection of Large Semimajor Axis Trans-Neptunian Objects". The Astronomical Journal. 154 (2): 8. arXiv:1706.05348. Bibcode:2017AJ....154...50S. doi:10.3847/1538-3881/aa7aed. hdl:10150/625487. S2CID 3535702.


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