(303712) 2005 PR21

--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: TNO, Cubewano orbital data, primary (osculating elements) [JPL] : semimajor axis a: 44.045 AU orbital period P: 292.318 yr (= 106769.2 d) eccentricity e: 0.10138 perihelion distance q: 39.5799 AU aphelion distance Q: 48.510 AU inclination i: 1.34656° argument of perihelion ω: 310.05° ascending node Ω: 339.1618° mean anomaly M: 49.18° perihelion passage TP: 1974 Jun 17 Epoch: 2014 May 23 data arc: 2005-2012 (46 obs.) Earth MOID: 38.5631 AU Jupiter Tisserand invariant TJ: 5.905 Neptune Tisserand invariant TN: 3.09 [*D] orbital data, secondary: semimajor axis as: 3600 ± 300 km (separation) [G12b] separation/primary radius as/rp: 32 [*E] separation/Hill radius as/rH: 0.0056 [*E] orbital period Ps: 22 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 6.1 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 265 km [*E] geometric albedo: (0.09 ) [*A] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1 g/cm3) [*A] Hill radius rH: 640000 km [*E] other data, primary: diameter dp: 227 km [*E] rotation period RPp: ? amplitude in mag., rotational ΔM: <0.28 [B13a] pole direction Β, λ: ? , ? other data, secondary: diameter ds: 137 km [*E] diameter ratio ds/dp: 0.603 [N08d] component mag. difference ΔM: 1.1 [I8925] rotation period RPs: ?