(82157) 2001 FM185

--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 orbital data, primary (osculating elements) [JPL] : semimajor axis a: 38.718 AU orbital period P: 240.920 yr (= 87996.1 d) eccentricity e: 0.05811 perihelion distance q: 36.468 AU aphelion distance Q: 40.968 AU inclination i: 5.3615° argument of perihelion ω: 110.72° ascending node Ω: 150.7203° mean anomaly M: 286.12° perihelion passage TP: 2063 Oct 30 Epoch: 2014 May 23 data arc: 2001-2008 (20 obs.) Earth MOID: 35.4562 AU Jupiter Tisserand invariant TJ: 5.557 Neptune Tisserand invariant TN: 3.03 [*D] orbital data, secondary: semimajor axis as: 3130 ± 90 km (separation) [G12b] separation/primary radius as/rp: 45 [*E] separation/Hill radius as/rH: 0.0079 [*E] orbital period Ps: 33 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 6.9 [MPC] 7.2 ± 0.5 [G12b] slope parameter G: (0.15) [*A] effective diameter dE: 183 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: 400000 km [*E] other data, primary: diameter dp: 138 km [*E] rotation period RPp: ? amplitude in mag., rotational ΔM: ? pole direction Β, λ: ? , ? other data, secondary: diameter ds: 120 km [*E] diameter ratio ds/dp: 0.867 [G12b] component mag. difference ΔM: 0.31 [G12b] rotation period RPs: ?