(16974) Iphthime

--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: Jupiter trojan asteroid, L4 orbital data, primary (osculating elements) [JPL] : semimajor axis a: 5.19017267 AU orbital period P: 11.82422567 yr (= 4318.879999 d) eccentricity e: 0.070401721 perihelion distance q: 4.82477558 AU aphelion distance Q: 5.55556977 AU inclination i: 15.036372° argument of perihelion ω: 134.715771° ascending node Ω: 241.559536° mean anomaly M: 261.735542° perihelion passage TP: 2021 Jun 13.86778 Epoch: 2018 Mar 23 data arc: 1974-2017 (1073 obs.) Earth MOID: 3.8459 AU Jupiter Tisserand invariant TJ: 2.927 orbital data, secondary: semimajor axis as: 179 ± 10 km [*D] separation/primary radius as/rp: 7.9 [*D] separation/Hill radius as/rH: 0.0093 [*E] orbital period Ps: 3.29 d [*A] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 9.8 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 57.34 ± 0.33 km [G12d] geometric albedo: 0.065 ± 0.010 [G12d] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 19000 km [*E] other data, primary: diameter dp: 45.5 ± 3.3 km [*D] rotation period RPp: 78.9 ± 0.4 h [M11e] amplitude in mag., rotational ΔM: ? pole direction Β, λ: ? , ? other data, secondary: diameter ds: 34.9 ± 5.44 km [*D] diameter ratio ds/dp: 0.767 ± 0.119 [*D] component mag. difference ΔM: 0.6 ± 0.3 [*D] rotation period RPs: ?