Asteroids with Satellites Database--Johnston's Archive

2005 EO304

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: TNO, Cubewano


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 45.734 AU
orbital period P: 309.291 yr
(= 112968.5 d)
eccentricity e: 0.0684
perihelion distance q: 42.606 AU
aphelion distance Q: 48.862 AU
inclination i: 3.41611°
argument of perihelion ω: 146.79°
ascending node Ω: 93.824°
mean anomaly M: 326.20°
perihelion passage TP: 2043 Jun 06
Epoch: 2014 May 23
data arc: 2005-2009 (25 obs.)
Earth MOID: 41.5942 AU
Jupiter Tisserand invariant TJ: 6.019
Neptune Tisserand invariant TN:3.11 [*D]


orbital data, secondary:
semimajor axis as: 69800 ± 2050 km [P11a]
separation/primary radius as/rp:920 [*D]
separation/Hill radius as/rH:0.155 [*D]
orbital period Ps: 3579 ± 164 d [P11a]
eccentricity es: 0.22 ± 0.02 [P11a]
inclination is:12.4° ± 0.65° [P11a]
ascending node Ωs:259° ± 2.5° [P11a]
argument of pericenter ωs:206° ± 7° [P11a]
mean anomaly M:193° ± 10.5° [P11a]
Epoch:2005 Mar 11.44
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.3 [MPC]
6.59 [P11a]
slope parameter G: (0.15) [*A]
effective diameter dE: 171 km [*D]
geometric albedo: 0.15 ± 0.01/0.01 [P11a]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: 2.1x1018 ± 8.05x1016 kg [P11a]
density ρ: (1 g/cm3) [*A]
Hill radius rH: 450000 km [*D]

other data, primary:
diameter dp: 152.4 ± 2/1.8 km [P11a]
color index V-I:1.43 ± 0.14 [B08d]
rotation period RPp: ?
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 78 ± 1.5/1.4 km [*D]
diameter ratio ds/dp: 0.513 ± 0.007 [P11a]
component mag. difference ΔM: 1.45 ± 0.03 [P11a]
color index V-I:1.36± 0.19 [B08d]
rotation period RPs: ?

-- 2005 EO304 --discovery and notes:

Primary discovered 2005 Mar 11 from Kitt Peak Observatory, Arizona, USA by M. W. Buie.

Companion discovered 2005 Apr 15 by S. D. Kern and J. L. Elliot using imaging observations from Clay Telescope, Las Campanas Observatory, Chile. Announced 2005 May 10 [K05b].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2005-2012, 2014 by Wm. Robert Johnston.
Last modified 20 September 2014.
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