(25251) 1998 UL25

--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: 2.54056169454 AU orbital period P: 4.0495132174 yr (= 1479.08470265 d) eccentricity e: 0.2709243245 perihelion distance q: 1.8522617336 AU aphelion distance Q: 3.22886165549 AU inclination i: 5.95835677° argument of perihelion ω: 155.1179186° ascending node Ω: 178.09700997° mean anomaly M: 334.97392737° perihelion passage TP: 2026 Sep 19.8213366 Epoch: 2026 Jun 09 data arc: 1990-2026 (3151 obs.) Earth MOID: 0.843363 AU Jupiter Tisserand invariant TJ: 3.386 orbital data, secondary: semimajor axis as: 4.6 km [*E] separation/primary radius as/rp: 3.2 [*E] separation/Hill radius as/rH: 0.010 [*E] orbital period Ps: 0.54188 ± 0.00017 d [B26k] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 14.85 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 2.99 ± 0.08 km [M19a] geometric albedo: 0.313 ± 0.073 [M19a] color index U-B: ? color index B-V: ? taxonomic type: mass m: ? density ρ: (2 g/cm3) [*A] Hill radius rH: 450 km [*E] other data, primary: diameter dp: 2.89 ± 0.08 km [*D] axial ratios a/b, b/c: 1.1, ? [*E] rotation period RPp: 2.9973 ± 0.0002 h [B26k] amplitude in mag., rotational ΔM: 0.07 [B26k] amplitude in mag., mutual events ΔM: 0.07 [B26k] pole direction Β, λ: ? , ? other data, secondary: diameter ds: >0.75 km [*D] diameter ratio ds/dp: >0.26 [B26k] component mag. difference ΔM: <2.93 [*D] rotation period RPs: ?