202421, also known as 2005 UQ513, is a cubewano with an absolute magnitude of 3.4. Mike Brown's website lists it as a highly likely dwarf planet. Its spectrum has a weak signature of absorption by water ice. Like Quaoar, it has a very red spectrum, which indicates that its surface probably contains a lot of complex, processed organic molecules. Its light curve shows variations of ~0.3 mag, but no period has been determined.A cubewano is a low-eccentricity Kuiper belt object (KBO) that orbits beyond Neptune and is not controlled by an orbital resonance with Neptune. Cubewanos have orbits with semi-major axes in the 40-50 AU range and, unlike Pluto, do not cross Neptune’s orbit. That is, they have low-eccentricity and sometimes low-inclination orbits like the classical planets.The name "cubewano" derives from the first trans-Neptunian object (TNO) found after Pluto and Charon, 15760 Albion, which until January 2018 had only had the provisional designation (15760) 1992 QB1. Similar objects found later were often called "QB1-o's", or "cubewanos", after this object, though the term "classical Kuiper belt object" is much more frequently used in the scientific literature.This image comprises 6 x Luminance (300 seconds each), 0.5m f/2.9 ASA Astrograph with FLI ML3200 camera at an altitude of 80 degrees on 25 October 2017. The field of view is 12' x 12'.
Hills Observatory: 1 January 2013 to 30 March 2020