(31346) 1998 PB1

--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, Amor orbital data, primary (osculating elements) [JPL] : semimajor axis a: 2.0294639991 AU orbital period P: 2.8911593403 yr (= 1056.0158932 d) eccentricity e: 0.429985049 perihelion distance q: 1.15682482 AU aphelion distance Q: 2.9021031761 AU inclination i: 5.9637866° argument of perihelion ω: 350.5342° ascending node Ω: 299.732528° mean anomaly M: 337.893737° perihelion passage TP: 2021 Sep 03.846013 Epoch: 2021 Jul 01 data arc: 1998-2021 (615 obs.) Earth MOID: 0.141241 AU Jupiter Tisserand invariant TJ: 3.685 orbital data, secondary: semimajor axis as: 3.6 km [*E] separation/primary radius as/rp: 7.9 [*E] separation/Hill radius as/rH: 0.043 [*E] orbital period Ps: 2.308 ± 0.004 d [P21d] eccentricity es: ? normalized ang. mom. αL: ?

other data, system (combined): absolute mag. H: 17.09 [MPC] 17.29 ± 0.08 [P21d] slope parameter G: (0.15) [*A] effective diameter dE: 0.981 ± 0.453/0.217 km [N18a] geometric albedo: 0.201 ± 0.138/0.109 [N18a] color index U-B: ? color index B-V: ? color index V-R: 0.43 ± 0.02 [P21d] taxonomic type: ? mass m: ? density ρ: (1.6 g/cm3) [*A] Hill radius rH: 80 km [*E] other data, primary: diameter dp: 0.92 ± 0.78/0.38 km [*D] rotation period RPp: 2.7358 ± 0.0002 h [P21d] amplitude in mag., rotational ΔM: 0.13 [P21d] amplitude in mag., mutual events ΔM: 0.15 [P21d] pole direction Β, λ: ? , ? other data, secondary: diameter ds: >0.35 ± 0.11 km [*D] diameter ratio ds/dp: >0.38 [P21d] component mag. difference ΔM: <2.10 [*D] rotation period RPs: ?