(5500) Twilley

--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: 2.2796606587 AU orbital period P: 3.4419559399 yr (= 1257.1981508 d) eccentricity e: 0.089623438 perihelion distance q: 2.075349633 AU aphelion distance Q: 2.4839716843 AU inclination i: 4.3972559° argument of perihelion ω: 341.244747° ascending node Ω: 112.51406° mean anomaly M: 279.425161° perihelion passage TP: 2020 Feb 02.384828 Epoch: 2019 Apr 27 data arc: 1955-2019 (1940 obs.) Earth MOID: 1.09272 AU Jupiter Tisserand invariant TJ: 3.597 orbital data, secondary: semimajor axis as: 7.8 km [*E] separation/primary radius as/rp: 3.6 [*E] separation/Hill radius as/rH: 0.011 [*E] orbital period Ps: 0.7315 ± 0.0003 d [C19a] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 13.6 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 4.48 ± 0.12 km [M11b] geometric albedo: 0.350 ± 0.056 [M11b] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 700 km [*E] other data, primary: diameter dp: 4.33 km [*D] rotation period RPp: 2.9554 ± 0.0002 h [C19a] amplitude in mag., rotational ΔM: 0.15 [C19a] amplitude in mag., mutual events ΔM: 0.105 ±0.025 [C19a] pole direction Β, λ: ? , ? other data, secondary: diameter ds: >1.17 km [*D] diameter ratio ds/dp: >0.27 [C19a] component mag. difference ΔM: <2.8 [*D] rotation period RPs: ?