(3221) Changshi

--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: 2.20390625457 AU orbital period P: 3.2718838523 yr (= 1195.05557706 d) eccentricity e: 0.15448742266 perihelion distance q: 1.8634304575 AU aphelion distance Q: 2.54438205162 AU inclination i: 3.65103041° argument of perihelion ω: 233.3966258° ascending node Ω: 78.58691096° mean anomaly M: 320.95190515° perihelion passage TP: 2026 Oct 16.6240098 Epoch: 2026 Jun 09 data arc: 1953-2026 (5976 obs.) Earth MOID: 0.851145 AU Jupiter Tisserand invariant TJ: 3.644 orbital data, secondary: semimajor axis as: 47.8 km (separation) [B26l] separation/primary radius as/rp: 16 [*E] separation/Hill radius as/rH: 0.050 [*E] orbital period Ps: 6.0 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 13.03 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 6.00 ± 0.04 km [M19a] geometric albedo: 0.373 ± 0.050 [M19a] color index U-B: ? color index B-V: ? color index J-H: 0.013 [S10b] taxonomic type: mass m: ? density ρ: (2.0 g/cm3) [*A] Hill radius rH: 950 km [*E] other data, primary: diameter dp: 6.0 ± 0.6 km [B26l] dimensions : 8.3 x 4.4 km [B26l] axial ratios a/b, b/c: 1.9, ? [*D] rotation period RPp: 2.709 h [JPL] amplitude in mag., rotational ΔM: 0.3 [B26l] pole direction Β, λ: ? , ? other data, secondary: diameter ds: 2.2 ± 0.8 km [B26l] diameter ratio ds/dp: 0.37 ± 0.14 [*D] component mag. difference ΔM: 2.18 ± 0.86 [*D] rotation period RPs: ?