(415029) 2011 UL21

--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: NEA, Apollo (PHA) orbital data, primary (osculating elements) [JPL] : semimajor axis a: 2.1215298663 AU orbital period P: 3.090166836 yr (= 1128.6834368 d) eccentricity e: 0.653436053 perihelion distance q: 0.735245765 AU aphelion distance Q: 3.5078139677 AU inclination i: 34.8874957° argument of perihelion ω: 284.9744279° ascending node Ω: 275.3180716° mean anomaly M: 346.48065071° perihelion passage TP: 2024 May 12.3862934 Epoch: 2024 Mar 31 data arc: 1989-2024 (1895 obs.) Earth MOID: 0.0171456 AU Jupiter Tisserand invariant TJ: 3.246 orbital data, secondary: semimajor axis as: >3 km [B24h] separation/primary radius as/rp: 4 [*E] separation/Hill radius as/rH: 0.035 [*E] orbital period Ps: 0.86 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 15.94 [MPC] slope parameter G: (0.15) [*A] effective diameter dE: 1.6 km [*D] geometric albedo: 0.3 [*D] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 86 km [*E] other data, primary: diameter dp: 1.5 km [B24h] rotation period RPp: 2.732 h [JPL] amplitude in mag., rotational ΔM: ? pole direction Β, λ: ? , ? other data, secondary: diameter ds: 0.4 km [*E] diameter ratio ds/dp: 0.3 [*E] component mag. difference ΔM: 2.6 [*D] rotation period RPs: ?