(6543) Senna

--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: 2.27639310953 AU orbital period P: 3.4346231736 yr (= 1254.49611417 d) eccentricity e: 0.21327822502 perihelion distance q: 1.7908880277 AU aphelion distance Q: 2.76189819139 AU inclination i: 4.174846084° argument of perihelion ω: 85.9582096° ascending node Ω: 283.29305803° mean anomaly M: 308.03360514° perihelion passage TP: 2026 Dec 07.0878900 Epoch: 2026 Jun 09 data arc: 1978-2026 (3498 obs.) Earth MOID: 0.794915 AU Jupiter Tisserand invariant TJ: 3.575 orbital data, secondary: semimajor axis as: 5.0 km [*E] separation/primary radius as/rp: 3.1 [*E] separation/Hill radius as/rH: 0.011 [*E] orbital period Ps: 0.5758 ± 0.0004 d [B26j] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 14.55 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 3.39 ± 0.08 km [M19a] geometric albedo: 0.337 ± 0.037 [M19a] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 460 km [*E] other data, primary: diameter dp: 3.26 ± 0.08 km [*D] dimensions : ~3.5 x ~3.0 km [*E] axial ratios a/b, b/c: 1.2, ? [*E] rotation period RPp: 3.3063 ± 0.0001 h [B26j] amplitude in mag., rotational ΔM: 0.18 [B26j] amplitude in mag., mutual events ΔM: 0.08 [B26j] pole direction Β, λ: ? , ? other data, secondary: diameter ds: >0.91 km [*D] diameter ratio ds/dp: >0.28 [B26j] component mag. difference ΔM: <2.76 [*D] rotation period RPs: ?