Asteroids with Satellites Database--Johnston's Archive

2013 WT44

compiled by Wm. Robert Johnston
last updated 20 September 2014

--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: 2.25956237 AU
orbital period P: 3.3966023 yr
(= 1240.60900 d)
eccentricity e: 0.56835774
perihelion distance q: 0.975322610 AU
aphelion distance Q: 3.54380214 AU
inclination i: 12.2046041°
argument of perihelion ω: 325.7739587°
ascending node Ω: 182.7639617°
mean anomaly M: 25.769123°
perihelion passage TP: 2014 Feb 23.196093
Epoch: 2014 May 23
data arc: 2013 Nov-2014 Apr (454 obs.)
Earth MOID: 0.0328567 AU
Jupiter Tisserand invariant TJ: 3.363


orbital data, secondary:
semimajor axis as: ?
orbital period Ps: ?
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 19.4 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 1.32 ± 0.11 km [M14b]
geometric albedo: 0.019 ± 0.004 [M14b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 76 km [*E]

other data, primary:
diameter dp: 1 ± 0.1 km [B14b]
rotation period RPp: 2.8849 h [W14e]
amplitude in mag., rotational ΔM: 0.05 [W14e]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: ?
diameter ratio ds/dp: ?
component mag. difference ΔM: ?
rotation period RPs: ?

-- 2013 WT44 --discovery and notes:

Primary discovered 2013 Nov 27 from Catalina Station, Arizona, USA by Catalina Sky Survey.

Companion discovered 2014 Mar 20 using radar observations. Announced 2014 Mar 22.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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