is a 1:6 resonant trans-Neptunian object located in the outermost region of the Solar System that takes almost a thousand years to complete an orbit around the Sun. It was discovered on 24 September 2008 by American astronomers Megan Schwamb, Michael Brown and David Rabinowitz at the Palomar Observatory in California, with no known earlier precovery images.
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 18 May 2019 (). As of 2025, it has not been named.
Orbit and classification
is located at the 1:6 Neptune resonance of 99 AU meaning that it completes roughly 1 orbit for every 6 orbits Neptune makes. It orbits the Sun at a distance of 42.3–157.5 AU once every 998 years and 4 months (semi-major axis of 99.89 AU). Its orbit has an eccentricity of 0.58 and an inclination of 21° with respect to the ecliptic. Currently located at 60.9 AU from the Sun, came to perihelion in 1954.
Physical characteristics
Based on an absolute magnitude of 4.4, is estimated by Johnston's Archive to be about in diameter, assuming a typical albedo of 0.126 for other Neptune resonant objects. Astronomer Mike Brown estimates a slightly bigger km using a albedo of 0.09 and a fainter 4.6 magnitude. The Asteroid Dynamic Site records a brighter 4.3 magnitude, which calculates to using the same albedo (and same formula as brown); using the average of these magnitudes and a standard assumed minor planet albedo range of 0.25 ~ 0.05, possible sizes of are produced.
See also List of trans-Neptunian objects
Notes
References
External links Orbit Fit and Astrometric record for 528381, Marc W. Buie, SwRI List Of Centaurs and Scattered-Disk Objects, Minor Planet Center