Asteroids with Satellites Database--Johnston's Archive

(130) Elektra and S/2003 (130) 1

compiled by Wm. Robert Johnston
last updated 27 May 2014
under construction--testing upgrades!

--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: 3.123238626 AU
orbital period P: 5.519706084 yr (= 2016.0726470 d)
eccentricity e: 0.208453864
perihelion distance q: 2.47218747 AU
aphelion distance Q: 3.774289787 AU
inclination i: 22.8674704°
argument of perihelion ω: 235.640394°
ascending node Ω: 145.408295°
mean anomaly M: 346.724120°
perihelion passage TP: 2014 Aug 05.34760
Epoch: 2014 May 23
data arc: 1893-2013 (1594 obs.)
Earth MOID: 1.53643 AU
Jupiter Tisserand invariant TJ: 3.062


orbital data, secondary:
binary dynamical type:L [P07f]
semimajor axis as: 1318 ± 25 km [M08c]
separation/primary radius as/rp:13 [*D]
separation/Hill radius as/rH:0.034 [*D]
orbital period Ps: 5.258 ± 0.0053 d [M08c]
eccentricity es: 0.13 ± 0.03 [M08c]
inclination is:3° [*MAg]
normalized ang. mom. αL: 0.46 [P07f]

other data, system (combined):
absolute mag. H: 7.12 [MPC]
slope parameter G: 0.15 [*A]
effective diameter dE: 198.93 ± 4.11 km [M11b]
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: 1.3 ± 0.3 g/cm3 [M08c]
Hill radius rH: 38000 km [*D]

other data, primary:
diameter dp: 198.93 ± 4.11 km [M11b]
axial ratios a/b, b/c:1.55;1.45 [D95a]
rotation period RPp: 5.22468 ± 0.00001 h [D95a]
amplitude in mag., rotational ΔM: 0.385 ± 0.195 [*MPb]
pole direction : 12±20° ; 83±4° ; [D95a]


other data, secondary:
diameter ds: 7 ± 3 km [M08c]
diameter ratio ds/dp: 0.035 ± 0.015 [*D]
component mag. difference ΔM: 8.5 [I8183]
rotation period RPs: ?

-- (130) Elektra and S/2003 (130) 1 --discovery and notes:

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

Named -.

Companion discovered 2003 Aug 15 by W. J. Merline, P. M. Tamblyn, C. Dumas, L. M. Close, C. R. Chapman, and F. Menard using AOT observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA. Announced 2003 Aug 17 [I8183]. Provisional designation S/2003 (130) 1.

--Links, more technical:

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--Links to ADS abstracts:


© 2003-2005, 2014 by Wm. Robert Johnston.
Last modified 27 May 2014.
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