(524366) 2001 XR254

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(524366) 2001 XR254 is a trans-Neptunian object in the cold classical Kuiper belt. It is a binary system with two roughly equal-sized bodies: the primary is about 170 km across and the secondary about 140 km, giving a combined diameter of roughly 220 km. The system has a density near 1 g/cm3 and an albedo around 0.14; both surfaces appear to have a neutral color.

Discovery and satellite: It was discovered on 10 December 2001 by David C. Jewitt, Scott S. Sheppard and Jan Kleyna using the 2.2-meter University of Hawaii telescope at Mauna Kea, Hawaii. The satellite was found by the Hubble Space Telescope, with images taken in 2007 (discovery announced in 2006).

Orbit and classification: 2001 XR254 is part of the dynamically cold population of classical Kuiper belt objects, with a low orbital eccentricity and small inclination. It orbits the Sun at about 40–45 AU and completes one orbit every about 280 years. The orbit has an eccentricity of about 0.037 and an inclination of about 1.23 degrees. The next perihelion is around September 7, 2120.

Numbering and naming: The Minor Planet Center numbered it as (524366) on 18 May 2019. As of 2025 it remains unnamed.