Asteroids with Satellites Database--Johnston's Archive

(523756) 2014 WD509

compiled by Wm. Robert Johnston
last updated 9 August 2020

--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, Cubewano

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 43.6548 AU
orbital period P: 288.435 yr
(= 105352.7 d)
eccentricity e: 0.04548
perihelion distance q: 41.6693 AU
aphelion distance Q: 45.6402 AU
inclination i: 1.336908°
argument of perihelion ω: 257.446°
ascending node Ω: 201.604°
mean anomaly M: 323.466°
perihelion passage TP: 2049 Sep 07.5
Epoch: 2020 May 31
data arc: 2010-2018 (145 obs.)
Earth MOID: 40.6865 AU
Jupiter Tisserand invariant TJ: 5.905
Neptune Tisserand invariant TN:3.095 [*D]

orbital data, secondary:
semimajor axis as: 7910 ± 50 km (separation) [G20a]
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 5.9 [MPC]
6.2 ± 0.5 [G20a]
slope parameter G: (0.15) [*A]
effective diameter dE: 293 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: 730000 km [*E]

other data, primary:
diameter dp: 239 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 170 km [*E]
diameter ratio ds/dp: 0.71 [*D]
component mag. difference ΔM: 0.75 [G20a]
rotation period RPs: ?

-- (523756) 2014 WD509 --discovery and notes:

Primary discovered 2010 Oct 08 from Haleakala, Hawaii, USA by PanSTARRS 1 program. Permanent number assigned 2018 Sep 25.

Companion discovered 2020 Jul 18 by Solar System Origins Legacy Survey (A. H. Parker et al.) using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2020 Jul [G20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2020 by Wm. Robert Johnston.
Last modified 9 August 2020.
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