Asteroids with Satellites Database--Johnston's Archive

(554099) 2012 KU50

compiled by Wm. Robert Johnston
last updated 28 Nov 2021

--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: 40.9456 AU
orbital period P: 262.0107 yr
(= 95699.4 d)
eccentricity e: 0.245351
perihelion distance q: 30.89954 AU
aphelion distance Q: 50.9917 AU
inclination i: 18.855771°
argument of perihelion ω: 127.2045°
ascending node Ω: 66.779716°
mean anomaly M: 24.896°
perihelion passage TP: 2003 Dec 08.86
Epoch: 2022 Jan 21
data arc: 2002-2021 (235 obs.)
Earth MOID: 29.9337 AU
Jupiter Tisserand invariant TJ: 5.274
Neptune Tisserand invariant TN:2.87546717184412 [*D]


orbital data, secondary:
semimajor axis as: 30000 km (separation) [C21a]
separation/primary radius as/rp:250 [*E]
separation/Hill radius as/rH:0.047 [*E]
orbital period Ps: 560 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.37 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 236 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: 640000 km [*E]

other data, primary:
diameter dp: 236 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


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

-- (554099) 2012 KU50 --discovery and notes:

Primary discovered 2012 May 18 from La Silla, Chile by ?. Linked to prediscovery observations from 2002 Mar 12. Permanent number assigned 2021 Jun 01.

Companion discovered 2014 Apr 23 by C. O. Chandler, C. A. Trujillo, W. M. Grundy, and J. K. Kueny using imaging observations from Cerro Tololo Inter-American Observatory, La Serena, Chile. Announced 2021 Nov 27 [C21a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2021 by Wm. Robert Johnston.
Last modified 28 Nov 2021.
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