Asteroids with Satellites Database--Johnston's Archive

(624) Hektor and S/2006 (624) 1

compiled by Wm. Robert Johnston
last updated 16 November 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: Jupiter trojan asteroid, L4


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 5.249788662 AU
orbital period P: 12.02853485 yr
(= 4393.505331 d)
eccentricity e: 0.024404703
perihelion distance q: 5.12166913 AU
aphelion distance Q: 3.377908197 AU
inclination i: 18.1690137°
argument of perihelion ω: 182.14671°
ascending node Ω: 342.809043°
mean anomaly M: 40.84955°
perihelion passage TP: 2013 Jul 28.4647
Epoch: 2014 Dec 09
data arc: 1907-2014 (1494 obs.)
Earth MOID: 4.13021 AU
Jupiter Tisserand invariant TJ: 2.899


orbital data, secondary:
binary dynamical type:L [M09a]
semimajor axis as: 957.5 ± 55.3 km [D15a]
separation/primary radius as/rp:10.4 [*D]
separation/Hill radius as/rH:0.011 [*D]
orbital period Ps: 2.965079 ± 0.000288 d [D15a]
eccentricity es: 0.31 ± 0.03 [M14a]
normalized ang. mom. αL: 1.29 [M09a]

other data, system (combined):
absolute mag. H: 7.2 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 250 ± 26 km [*D]
geometric albedo: 0.023 ± 0.001 [S05a]
color index U-B: 0.249 [JPL]
color index B-V: 0.776 [JPL]
taxonomic type: D (Tholen) [JPL]
mass m: 7.91x1018 ± 1.41x1018 kg [D15a]
density ρ: 2.43 ± 0.35 g/cm3[D15a]
Hill radius rH: 84000 km [*D]

other data, primary:
diameter dp: 184 ± 10 km [D15a]
dimensions :416 x 131 x 120km [D15a]
axial ratios a/b, b/c:1.75, ? [S05a]
rotation period RPp: 6.921 ± 0 h [M14a]
amplitude in mag., rotational ΔM: ?
pole direction Β, λ: 148 ± 6° , 26 ± 9° [D95a]


other data, secondary:
diameter ds: 12 ± 3 km [M14a]
diameter ratio ds/dp: 0.048 ± 0.013 [*D]
component mag. difference ΔM: 6.6 [*D]
rotation period RPs: ?

-- (624) Hektor and S/2006 (624) 1 --discovery and notes:

Primary discovered 1907 Feb 10 from Heidelberg, Germany by A. Kopff. Alternate designation(s): 1907 XM, 1948 VD. Permanent number assigned 1907.

Named 1907 for the Trojan hero.

Companion discovered 2006 Jul 16 by F. Marchis, M. H. Wong, J. Berthier, P. Descamps, D. Hestroffer, F. Vachier, D. Le Mignant, and I. de Pater using adaptive optics telescope observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA. Announced 2006 Jul 21 [M06c]. Provisional designation S/2006 (624) 1.

--Links, more technical:

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--Links to ADS abstracts:


© 2006-2008, 2014 by Wm. Robert Johnston.
Last modified 16 November 2014.
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