Asteroids with Satellites Database--Johnston's Archive

(2449) Kenos

compiled by Wm. Robert Johnston
last updated 29 May 2019

--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: Mars crossing asteroid

orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 1.909047502 AU
orbital period P: 2.637698196 yr
(= 963.4374618 d)
eccentricity e: 0.168238351
perihelion distance q: 1.587872499 AU
aphelion distance Q: 2.2302225049 AU
inclination i: 24.982612°
argument of perihelion ω: 102.258123°
ascending node Ω: 179.863854°
mean anomaly M: 244.821506°
perihelion passage TP: 2015 Oct 13.242433
Epoch: 2014 Dec 09
data arc: 1978-2015 (905 obs.)
Earth MOID: 0.712267 AU
Jupiter Tisserand invariant TJ: 3.808

orbital data, secondary:
semimajor axis as: 52 km [*E]
separation/primary radius as/rp:34 [*E]
separation/Hill radius as/rH:0.14 [*E]
orbital period Ps: 0.6604 ± 0.0004 d [W15h]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 14.26 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.17 km [A17c]
geometric albedo: 0.348 [*A17]
color index U-B: 0.356 [JPL]
color index B-V: 0.684 [JPL]
taxonomic type: E (Tholen) [JPL]
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 380 km [*E]

other data, primary:
diameter dp: 3.09 km [*D]
rotation period RPp: 3.8481 ± 0.0003 h [W15h]
amplitude in mag., rotational ΔM: 0.14 ± 0.02 [W15h]
pole direction Β, λ: ? , ?

other data, secondary:
diameter ds: 0.71 km [*D]
diameter ratio ds/dp: 0.23 [W17a]
component mag. difference ΔM: 3.2 [*D]
rotation period RPs: 15.85 ± 0.01 h [W15h]

-- (2449) Kenos --discovery and notes:

Primary discovered 1978 Apr 08 from Cerro Tololo Observatory, La Serena, Chile by W. Liller. Alternate designation(s): 1978 GC . Permanent number assigned 1981 Oct 01.

Named 1993 Feb 06 for the South American mythological first man [MPC021606].

Companion discovered 2015 Feb 27 by B. D. Warner using lightcurve observations from Palmer Divide Station, Eaton, Colorado, United States. Announced 2015 Jun [W15h].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:

© 2015-2017, 2019 by Wm. Robert Johnston.
Last modified 29 May 2019.
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