is a large trans-Neptunian object orbiting in the scattered disc in the outermost regions of the Solar System. The object was discovered on 9 September 2010, by American astronomers David Rabinowitz, Megan Schwamb and Suzanne Tourtellotte at ESO's La Silla Observatory in northern Chile.
The Hubble Space Telescope photographed on 10 September 2026, during a search for moons around large trans-Neptunian objects.
Orbit and classification
orbits the Sun at a distance of 37.5–61.9 AU once every 350 years and 4 months (127,948 days; semi-major axis of 49.7 AU). Its orbit has an eccentricity of 0.25 and an inclination of 31° with respect to the ecliptic. The body's observation arc begins with a precovery observation taken at Siding Spring Observatory in August 1976.
Due to its relatively high eccentricity and inclination, it is an object of the scattered disc rather than one of the regular Kuiper belt. However its perihelion of 37.5 AU is too low to make it a detached object, which typically stay above 40 AU and never come close to the orbit of Neptune.
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 20 September 2021, receiving the number in the minor planet catalog (). , it has not been named.
Physical characteristics
Diameter and albedo
Johnston's Archive estimates a mean diameter of . Mike Brown estimates a diameter of . However, Mike Brown's estimate uses the outdated H of 4.2, not the newer 3.8.
Rotation period
As of 2026, no rotational lightcurve of this object has been obtained from photometric observations. The object's rotation period, pole and shape remain unknown. In 2013, Benecchi and colleagues put an upper bound of 0.08 mag on its lightcurve amplitude.
Spectra and surface
has color indices of: g′−r′ 0.80 ± 0.03, g′−i′ 1.21 ± 0.04, and r′−i′ 0.41 ± 0.03. Its albedo has not been measured, but it has been estimated to be 0.10, and 0.124.
References
External links MPEC 2011-U09 : 2010 RF43, Minor Planet Electronic Circular, 17 October 2011