(2150) Nyctimene

--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, Hungaria orbital data, primary (osculating elements) [JPL] : semimajor axis a: 1.91314089754 AU orbital period P: 2.64623638126 yr (= 966.53783826 d) eccentricity e: 0.05714331914 perihelion distance q: 1.80381767667 AU aphelion distance Q: 2.02246411842 AU inclination i: 25.323924832° argument of perihelion ω: 235.85398636° ascending node Ω: 200.996146729° mean anomaly M: 234.6440065° perihelion passage TP: 2025 Sep 18.5591971 Epoch: 2024 Oct 17 data arc: 1969-2024 (4855 obs.) Earth MOID: 0.844897 AU Jupiter Tisserand invariant TJ: 3.814 orbital data, secondary: semimajor axis as: 18 km [*E] separation/primary radius as/rp: 6.0 [*E] separation/Hill radius as/rH: 0.021 [*E] orbital period Ps: 1.5838 ± 0.0004 d [W24c] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 13.25 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 6.06 ± 0.04 km [M19a] geometric albedo: 0.22 ± 0.041 [M19a] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 830 km [*E] other data, primary: diameter dp: 5.92 ± 0.04 km [*D] rotation period RPp: 6.12514 ± 0.00006 h [W24c] amplitude in mag., rotational ΔM: 0.65 ± 0.02 [W24c] amplitude in mag., mutual events ΔM: 0.11 ±0.01 [W24c] pole direction Β, λ: ? , ? other data, secondary: diameter ds: >1.30 ± 0.12 km [*D] diameter ratio ds/dp: >0.22 ± 0.02 [W24c] component mag. difference ΔM: 3.3 ± 0.2 [*D] rotation period RPs: ?