2021 DS15

--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: TNO orbital data, primary (osculating elements) [JPL] : semimajor axis a: 43.14 AU orbital period P: 283.3 yr (= 103488 d) eccentricity e: 0.01 perihelion distance q: 42.7 AU aphelion distance Q: 43.58 AU inclination i: 2.551° argument of perihelion ω: 150° ascending node Ω: 276.748° mean anomaly M: 48° perihelion passage TP: 1983 Dec 14 Epoch: 2021 May 05 data arc: 2021 Feb-Dec (6 obs.) Earth MOID: 41.707 AU Jupiter Tisserand invariant TJ: 5.873 Neptune Tisserand invariant TN: 3.090 [*D] orbital data, secondary: semimajor axis as: 19800 km (separation) [T21a] separation/primary radius as/rp: 220 [*E] separation/Hill radius as/rH: 0.033 [*E] orbital period Ps: 360 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 6.39 ± 0.16 [JPL] slope parameter G: (0.15) [*A] effective diameter dE: 232 km [*E] geometric albedo: (0.09 ) [*A] color index U-B: ? color index B-V: ? taxonomic type: ? mass m: ? density ρ: (1 g/cm3) [*A] Hill radius rH: 600000 km [*E] other data, primary: diameter dp: 178 km [*E] rotation period RPp: ? amplitude in mag., rotational ΔM: ? pole direction Β, λ: ? , ? other data, secondary: diameter ds: 148 km [*E] diameter ratio ds/dp: 0.83 [*D] component mag. difference ΔM: 0.4 [T21a] rotation period RPs: ?