Asteroids with Satellites Database--Johnston's Archive

2003 FE128

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, 1:2 resonance


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 47.949 AU
orbital period P: 332.030 yr
(= 121274.0 d)
eccentricity e: 0.25251
perihelion distance q: 35.8412 AU
aphelion distance Q: 60.057 AU
inclination i: 3.38370°
argument of perihelion ω: 53.378°
ascending node Ω: 169.1866°
mean anomaly M: 5.031°
perihelion passage TP: 2009 Oct 01
Epoch: 2014 May 23
data arc: 2003-2013 (43 obs.)
Earth MOID: 34.8343 AU
Jupiter Tisserand invariant TJ: 5.973
Neptune Tisserand invariant TN:3.07 [*D]


orbital data, secondary:
semimajor axis as: 2140 ± 50 km (separation) [G12b]
separation/primary radius as/rp:24 [*E]
separation/Hill radius as/rH:0.0045 [*E]
orbital period Ps: 14 d [*E]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 6.4 [MPC]
6.74 ± 0.18 [P13c]
slope parameter G: (0.15) [*A]
effective diameter dE: 221 km [*E]
geometric albedo: (0.09 ) [*A]
color index U-B: ?
color index B-V: ?
color index V-R:0.69 ± 0.06 [P13c]
color index V-I:1.27 ± 0.08 [P13c]
taxonomic type: RR (G-mode) [P13c]
mass m: ?
density ρ: (1 g/cm3) [*A]
Hill radius rH: 470000 km [*E]

other data, primary:
diameter dp: 178 km [*E]
rotation period RPp: 5.85 ± 0.15 h [T14a]
amplitude in mag., rotational ΔM: 0.5 ± 0.14 [T14a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 131 km [*E]
diameter ratio ds/dp: 0.735 [G12b]
component mag. difference ΔM: 0.67 [G12b]
rotation period RPs: ?

-- 2003 FE128 --discovery and notes:

Primary discovered 2003 Mar 31 from Kitt Peak Observatory, Arizona, USA by M. W. Buie.

Companion discovered 2010 Jun 26 using Hubble Space Telescope observations from Hubble Space Telescope. Announced 2012.

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


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