is an extreme trans-Neptunian object from the scattered disc, located in the outermost regions of the Solar System, approximately in diameter. It was discovered on 2 August 2013, by astronomers of the Outer Solar System Origins Survey at Mauna Kea Observatory, Hawaii, United States.
Orbit
With a semi-major axis of 196 AU, orbits the Sun at a distance of 43.9–348 AU once every 2,742 years. Its orbit has an eccentricity of 0.78 and an inclination of 11° with respect to the ecliptic. It has a similar orbit to , except for a smaller inclination.
belongs to a small number of detached objects with perihelion distances of 30 AU or more, and semi-major axes of 150 AU or more.minorplanetcenter.net: q>30, a>150 Such objects can not reach such orbits without some perturbing object, which leads to the speculation of Planet Nine.
Physical characteristics
Spectral type
The object is estimated to have a bluish spectra (BB).
Diameter
has been estimated to measure 243 and 340 kilometers in diameter, based on an assumed albedo of 0.09 and 0.04, respectively. A generic magnitude-to-diameter conversion gives a mean-diameter of 260 kilometers, using a typical albedo of 0.08 and a published absolute magnitude of 6.2951.
Numbering and naming
was numbered (505478) by the Minor Planet Center on 4 November 2017 (). As of 2025, this minor planet has not received a name.
References
External links MPEC 2017-M21 : 2013 UT15 Asteroid Lightcurve Database (LCDB), query form (info ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (505001)-(510000) – Minor Planet Center