(3969) Rossi

--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: 2.22019472365 AU orbital period P: 3.30822318948 yr (= 1208.32851996 d) eccentricity e: 0.12536497089 perihelion distance q: 1.94186007674 AU aphelion distance Q: 2.49852937056 AU inclination i: 2.146060842° argument of perihelion ω: 212.2942237° ascending node Ω: 172.6381884° mean anomaly M: 333.92033951° perihelion passage TP: 2025 Jan 12.5355488 Epoch: 2024 Oct 17 data arc: 1968-2024 (7199 obs.) Earth MOID: 0.945219 AU Jupiter Tisserand invariant TJ: 3.639 orbital data, secondary: semimajor axis as: 7.2 km [*E] separation/primary radius as/rp: 3.8 [*E] separation/Hill radius as/rH: 0.013 [*E] orbital period Ps: 0.8069 ± 0.0002 d [B24o] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 14.46 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 3.88 ± 0.12 km [M19a] geometric albedo: 0.223 ± 0.045 [M19a] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 570 km [*E] other data, primary: diameter dp: 3.74 ± 0.12 km [*D] rotation period RPp: 2.88972 ± 0.00008 h [B24o] amplitude in mag., rotational ΔM: 0.13 [B24o] amplitude in mag., mutual events ΔM: 0.12 ±0.04 [B24o] pole direction Β, λ: ? , ? other data, secondary: diameter ds: 1.05 ± 0.08 km [*D] diameter ratio ds/dp: 0.28 ± 0.02 [B24o] component mag. difference ΔM: 2.76 ± 0.16 [*D] rotation period RPs: ?