2021 DM15

--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: 45.36 AU orbital period P: 305.6 yr (= 111603 d) eccentricity e: 0.033 perihelion distance q: 43.9 AU aphelion distance Q: 46.84 AU inclination i: 2.3926° argument of perihelion ω: 29° ascending node Ω: 130.439° mean anomaly M: 314° perihelion passage TP: 2060 May 25 Epoch: 2021 May 04 data arc: 2021 Feb-Dec (11 obs.) Earth MOID: 42.895 AU Jupiter Tisserand invariant TJ: 6.012 Neptune Tisserand invariant TN: 3.116 [*D] orbital data, secondary: semimajor axis as: 13000 km (separation) [T21b] separation/primary radius as/rp: 230 [*E] separation/Hill radius as/rH: 0.033 [*E] orbital period Ps: 390 d [*E] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 7.4 ± 0.13 [JPL] slope parameter G: (0.15) [*A] effective diameter dE: 146 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: 390000 km [*E] other data, primary: diameter dp: 113 km [*E] rotation period RPp: ? amplitude in mag., rotational ΔM: ? pole direction Β, λ: ? , ? other data, secondary: diameter ds: 92 km [*E] diameter ratio ds/dp: 0.81 [*D] component mag. difference ΔM: 0.45 ± 0.05 [T21b] rotation period RPs: ?