Asteroids with Satellites Database--Johnston's Archive

(130) Elektra, S/2003 (130) 1, S/2014 (130) 1, and third companion

compiled by Wm. Robert Johnston
last updated 7 November 2021

--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: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 3.1266224144 AU
orbital period P: 5.528678778 yr
(= 2019.3499237 d)
eccentricity e: 0.209225934
perihelion distance q: 2.472451919 AU
aphelion distance Q: 3.7807929096 AU
inclination i: 22.78180072°
argument of perihelion ω: 237.588274°
ascending node Ω: 145.0087347°
mean anomaly M: 87.7577563°
perihelion passage TP: 2020 Feb 24.739949
Epoch: 2021 Jul 01
data arc: 1893-2021 (3377 obs.)
Earth MOID: 1.54149 AU
Jupiter Tisserand invariant TJ: 3.062


orbital data, S/2003 (130) 1:
binary dynamical type:L [P07f]
semimajor axis as: 1298 ± 0.54 km [Y16a]
separation/primary radius as/rp:13.0 [*D]
separation/Hill radius as/rH:0.034 [*D]
orbital period Ps: 5.287 ± 0.001 d [Y16a]
eccentricity es: 0.0835 ± 0.0096 [Y16a]
inclination is:160.21° ± 1.5° [Y16a]
ascending node Ωs:176.1° ± 5.7° [Y16a]
argument of pericenter ωs:184.4° ± 14.1° [Y16a]
mean anomaly M:117.3° ± 11.7° [Y16a]
normalized ang. mom. αL: 0.46 [P07f]


orbital data, S/2014 (130) 1:
semimajor axis as: 497.6 ± 0.33 km [Y16a]
separation/primary radius as/rp:5.0 [*D]
separation/Hill radius as/rH:0.013 [*D]
orbital period Ps: 1.256 ± 0.003 d [Y16a]
eccentricity es: 0.157 ± 0.036 [Y16a]
inclination is:165.3° ± 8.2° [Y16a]
ascending node Ωs:196.6° ± 9.6° [Y16a]
argument of pericenter ωs:312.9° ± 11.4° [Y16a]
mean anomaly M:50.6° ± 12.9° [Y16a]
normalized ang. mom. αL: ?


orbital data, third companion:
semimajor axis as: 345 km [B21i]
separation/primary radius as/rp:3.5 [*D]
separation/Hill radius as/rH:0.009 [*D]
orbital period Ps: 0.7 d [B21i]
eccentricity es: ?
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 7.21 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 199 ± 7 km [H17a]
geometric albedo: 0.071 ± 0.011 [M11b]
color index U-B: 0.483 [T95a]
color index B-V: 0.753 [T95a]
taxonomic type: Ch (SMASSII) [JPL]
G (Tholen) [JPL]
mass m: 6.6x1018 ± 4x1017 kg [M08c]
density ρ: 1.6 ± 0.13 g/cm3[H17a]
Hill radius rH: 38000 km [*D]

other data, primary:
diameter dp: 199 ± 7 km [H17a]
dimensions :262 x 205 x 164 km [H17a]
axial ratios a/b, b/c:1.28, 1.25 [*D]
rotation period RPp: 5.224663 h [H17a]
amplitude in mag., rotational ΔM: 0.58 [W14e]
pole direction Β, λ: -88° , 71° [H17a]


other data, S/2003 (130) 1:
diameter ds: 6.0 ± 1.5 km [Y16a]
diameter ratio ds/dp: 0.03 ± 0.008 [*D]
component mag. difference ΔM: 7.6 [*D]
rotation period RPs: ?


other data, S/2014 (130) 1:
diameter ds: 2.0 ± 1.5 km [Y16a]
diameter ratio ds/dp: 0.010 ± 0.008 [*D]
component mag. difference ΔM: 10.0 [*D]
rotation period RPs: ?


other data, third companion:
diameter ds: 1.6 km [B21i]
diameter ratio ds/dp: 0.008 [*D]
component mag. difference ΔM: 10.52 ± 0.5 [B21i]
rotation period RPs: ?

-- (130) Elektra, S/2003 (130) 1, S/2014 (130) 1, and third companion --discovery and notes:

Primary discovered 1873 Feb 17 from Clinton, New York, USA by C. H. F. Peters. Permanent number assigned 1873.

Named - for the Greek mythological character.

S/2003 (130) 1 discovered 2003 Aug 15 by W. J. Merline, P. M. Tamblyn, C. Dumas, L. M. Close, C. R. Chapman, and F. Menard using adaptive optics telescope observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA. Announced 2003 Aug 17 [M03h]. Provisional designation S/2003 (130) 1.

S/2014 (130) 1 discovered 2014 Dec 06 by B. Yang, Z. Wahhaj, L. Beauvalet, F. Marchis, C. Dumas, M. Marsset, E. L. Nielsen, and F. Vachier using adaptive optics telescope observations from European Southern Observatory, Cerro Paranal, Chile. Announced 2014 Dec 17 [Y14b]. Provisional designation S/2014 (130) 1. Erroneous designation S/2014 (130) 2 retracted.

Third companion discovered 2014 Dec 09 by A. Berdeu, M. Langlois, and F. Vachier using adaptive optics telescope observations from Very Large Telescope, European Southern Observatory, Cerro Paranal, Chile. Announced 2021 Nov 06 [B21i].

--Links, more technical:

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--Links to ADS abstracts:


© 2003-2015, 2021 by Wm. Robert Johnston.
Last modified 7 November 2021.
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