(2171) Kiev

--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: main belt asteroid orbital data, primary (osculating elements) [JPL] : semimajor axis a: 2.2553847828 AU orbital period P: 3.3871230074 yr (= 1237.1700439 d) eccentricity e: 0.16670166 perihelion distance q: 1.879408396 AU aphelion distance Q: 2.6313611692 AU inclination i: 7.5168189° argument of perihelion ω: 180.259705° ascending node Ω: 102.052214° mean anomaly M: 329.756799° perihelion passage TP: 2020 Sep 11.933285 Epoch: 2021 Jul 01 data arc: 1949-2020 (2639 obs.) Earth MOID: 0.862939 AU Jupiter Tisserand invariant TJ: 3.594 orbital data, secondary: semimajor axis as: 17 km [*E] separation/primary radius as/rp: 4.35 [*E] separation/Hill radius as/rH: 0.015 [*E] orbital period Ps: 0.9567 ± 0.0004 d [R20b] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 12.7 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 8.04 ± 0.15 km [M14c] geometric albedo: 0.108 ± 0.009 [M14c] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 1100 km [*E] other data, primary: diameter dp: 7.82 km [*D] rotation period RPp: 3.1716 ± 0.0002 h [R20b] amplitude in mag., rotational ΔM: 0.11 [R20b] amplitude in mag., mutual events ΔM: 0.09 ±0.03 [R20b] pole direction Β, λ: ? , ? other data, secondary: diameter ds: >1.88 km [*D] axial ratios a/b, b/c: 1.3;? [] diameter ratio ds/dp: >0.24 [R20b] component mag. difference ΔM: <3.1 [*D] rotation period RPs: 22.96 ± 0.01 h [R20b]