(20037) Duke

--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: Mars crossing asteroid orbital data, primary (osculating elements) [JPL] : semimajor axis a: 1.8840804951 AU orbital period P: 2.5861718646 yr (= 944.5992735 d) eccentricity e: 0.1205403461 perihelion distance q: 1.6569727802 AU aphelion distance Q: 2.11118821 AU inclination i: 22.54517266° argument of perihelion ω: 95.5789017° ascending node Ω: 228.62311102° mean anomaly M: 35.1825376° perihelion passage TP: 2023 Jun 12.6850014 Epoch: 2023 Sep 13 data arc: 1992-2023 (3004 obs.) Earth MOID: 0.778641 AU Jupiter Tisserand invariant TJ: 3.865 orbital data, secondary: semimajor axis as: 2.7 km [*E] separation/primary radius as/rp: 3.1 [*E] separation/Hill radius as/rH: 0.010 [*E] orbital period Ps: 0.5754 ± 0.0004 d [W23f] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 15.35 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 1.8 ± 0.28 km [M**] geometric albedo: 0.547 ± 0.193 [M**] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 260 km [*E] other data, primary: diameter dp: 1.77 ± 0.28 km [*D] rotation period RPp: 2.758 ± 0.0002 h [W23f] amplitude in mag., rotational ΔM: 0.14 [W23f] amplitude in mag., mutual events ΔM: 0.16 [W23f] pole direction Β, λ: ? , ? other data, secondary: diameter ds: >0.34 ± 0.06 km [*D] diameter ratio ds/dp: >0.19 ± 0.02 [W23f] component mag. difference ΔM: <3.6 ± 0.2 [*D] rotation period RPs: ?