(42773) 1998 UN15

--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: 3.18119806 AU orbital period P: 5.6740644652 yr (= 2072.4520459 d) eccentricity e: 0.1853534305 perihelion distance q: 2.5915520864 AU aphelion distance Q: 3.7708440337 AU inclination i: 1.90816317° argument of perihelion ω: 267.2942918° ascending node Ω: 88.4425356° mean anomaly M: 353.8946076° perihelion passage TP: 2026 Jul 14.1475914 Epoch: 2026 Jun 09 data arc: 1995-2025 (2210 obs.) Earth MOID: 1.58681 AU Jupiter Tisserand invariant TJ: 3.172 orbital data, secondary: semimajor axis as: 19.2 km (separation) [M26f] separation/primary radius as/rp: 4.3 [*E] separation/Hill radius as/rH: 0.011 [*E] orbital period Ps: 0.96 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 14.23 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 9.3 km [*D] geometric albedo: 0.041 [*D] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 1800 km [*E] other data, primary: diameter dp: 8.9 km [M26f] rotation period RPp: ? amplitude in mag., rotational ΔM: ? pole direction Β, λ: ? , ? other data, secondary: diameter ds: 2.74 ± 0.72 km [*D] dimensions : ~4.3 x ~1.8 km [M26f] axial ratios a/b, b/c: 2.5; ? [*D] diameter ratio ds/dp: >0.31 [*D] component mag. difference ΔM: <2.56 [*D] rotation period RPs: ?