Asteroids with Satellites Database--Johnston's Archive

2005 CE81

compiled by Wm. Robert Johnston
last updated 7 June 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: 42.534 AU
orbital period P: 277.4 yr
(= 101320.2 d)
eccentricity e: 0.04261
perihelion distance q: 40.721 AU
aphelion distance Q: 44.346 AU
inclination i: 3.08705°
argument of perihelion ω: 44.78°
ascending node Ω: 103.903°
mean anomaly M: 5.89°
perihelion passage TP: 2015 Nov 16
Epoch: 2020 May 31
data arc: 2005-2020 (20 obs.)
Earth MOID: 39.7333 AU
Jupiter Tisserand invariant TJ: 5.827
Neptune Tisserand invariant TN:3.08002550677492 [*D]


orbital data, secondary:
semimajor axis as: 6960 ± 55 km (separation) [*E]
separation/primary radius as/rp:130 [*E]
separation/Hill radius as/rH:0.020 [*E]
orbital period Ps: 150 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 7.4 [MPC]
8 ± 0.5 [G20a]
slope parameter G: (0.15) [*A]
effective diameter dE: 147 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: 360000 km [*E]

other data, primary:
diameter dp: 107 km [*E]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 102 km [*E]
diameter ratio ds/dp: 0.95
component mag. difference ΔM: 0.1 [G20a]
rotation period RPs: ?

-- 2005 CE81 --discovery and notes:

Primary discovered 2005 Feb 10 from Mauna Kea, Hawaii, USA by B. Gladman.

Companion discovered 2020 Apr 06 by Solar System Origins Legacy Survey (A. H. Parker et al.) using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2020 May [G20a].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2020 by Wm. Robert Johnston.
Last modified 7 June 2020.
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