It orbits the Sun at a distance of 5.0–5.4AU once every 11 years and 12 months (4,378 days; semi-major axis of 5.24AU). Its orbit has an eccentricity of 0.04 and a high inclination of 43° with respect to the ecliptic.[3] The body's observation arc begins with a precovery taken at Palomar Observatory in September 1953, or 46 years prior to its official discovery observation at Fountain Hills.[1]
Classification as centaur
Periboea was originally listed by the Minor Planet Center (MPC) as a centaur. However, its location close to L5, its low albedo and spectral slope, as well as its estimated dynamical lifetime of more than a billion years, led to the conclusion that the formerly classified centaur is indeed a Jupiter trojan.[6]
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, and observations by French and Spanish astronomers, Periboea measures between 51.5 and 55.34 kilometers in diameter and its surface has an albedo between 0.053 and 0.110.[6][7][8] The Collaborative Asteroid Lightcurve Link assumes a standard albedo of a carbonaceous asteroid 0.057 and calculates a diameter of 61.04 kilometers based on an absolute magnitude of 9.8.[10]
100+ largest Jupiter trojans
Largest Jupiter Trojans by survey(A) (mean-diameter in kilometers; RP: rotation period in hours; YoD: Year of Discovery)
Note: missing data was completed with figures from the JPL SBDB (query) and from the LCDB (query form) for the WISE/NEOWISE and SIMPS catalogs, respectively. These figures are given in italics. Also, listing is incomplete above #100.
↑Perna, Davide; Dotto, E.; Barucci, A.; Rossi, A.; de Bergh, C.; Doressoundiram, A.; etal. (September 2008). "Light Curves and Densities of Centaurs and Trans-Neptunian Objects from the ESO Large Program". American Astronomical Society. 40: 483. Bibcode:2008DPS....40.4708P.
