(459865) 2013 XZ8

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: Centaur orbital data, primary (osculating elements) [JPL] : semimajor axis a: 13.368314 AU orbital period P: 48.879095 yr (= 17853.09 d) eccentricity e: 0.37085271 perihelion distance q: 8.4106386 AU aphelion distance Q: 18.325989 AU inclination i: 22.5598298° argument of perihelion ω: 288.19584° ascending node Ω: 266.604654° mean anomaly M: 37.615924° perihelion passage TP: 2021 Apr 30.5543 Epoch: 2026 Jun 09 data arc: 2008-2024 (800 obs.) Earth MOID: 7.48671 AU Jupiter Tisserand invariant TJ: 3.139 Neptune Tisserand invariant TN: 3.393 [*D] orbital data, secondary: semimajor axis as: 290 ± 84 km (separation) [P26m] separation/primary radius as/rp: 11 [*E] separation/Hill radius as/rH: 0.0083 [*E] orbital period Ps: 3.9 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 9.49 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 70 km [*E] geometric albedo: (0.058) [*A] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1 g/cm3) [*A] Hill radius rH: 35000 km [*E] other data, primary: diameter dp: 53 km [*E] rotation period RPp: 87.744 h [JPL] amplitude in mag., rotational ΔM: ? pole direction Β, λ: ? , ? other data, secondary: diameter ds: 45 km [*E] diameter ratio ds/dp: 0.85 ± 0.04 [*D] component mag. difference ΔM: 0.35 ± 0.09 [P26m] rotation period RPs: ?