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

compiled by Wm. Robert Johnston
last updated 2 September 2005

Orbital elements and other data (Assumed or derived values in parenthesis, my estimates in italics and parenthesis. Source identifications in brackets, see this link for sources):

orbital data, primary (osculating elements) [JPL]:
semimajor axis a: 3.11918144818436 AU
orbital period P: 5.509 y (=2012.2 d)
eccentricity e: 0.212329001771479
perihelion distance q: 2.45688876494726 AU
aphelion distance Q: 3.78147413 AU
inclination i: 22.8816423987429°
argument of perihelion omega: 234.472706150356°
ascending node OMEGA: 145.799838116783°
mean anomaly M: 100.676499195667°
perihelion passage TP: 2003-07-17.2895372
Epoch: 30 JAN 2005
data arc: 1893-2005 (569 obs.)

orbital data, secondary:
semimajor axis a: 1252 ± 30 km [MAg]
semimajor axis/primary radius a/Rp: (13?)
orbital period P: 3.92 ± 0.03 d [MAg]
eccentricity e: 0.01 [MAg]
inclination i: 3° or 46° [MAg]

other data, primary:
diameter: 182.3 ± 11.8 km [IR]
triaxial ratio a/b: 1.40 [SBb]
absolute magnitude H: 7.12 [JPL]
rotation period: 0.2176946 d (=5.22467 h) [SBb]
amplitude delta M: 0.19 to 0.58 [MPb]
color index U-B: 0.483 ± 0.031 [SBa]
color index B-V: 0.753 ± 0.029 [SBa]
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) [a]
geometric albedo: 0.076 ± 0.011 [IR]
mass: 1.28x1019 kg [MAg]
density: (3.8 ± 0.3) g/cm3 [MAg]
type: Ch [JPL]

other data, secondary:
diameter: 4 km [I8183]
diameter ratio Ds/Dp: (0.04)
component magnitude difference: 8.5 [I8183]
rotation period: ?

--(130) Elektra--discovery and notes:

Primary discovered 17 February 1873 from Clinton, New York, USA by Christian Heinrich Friedrich Peters.

Secondary discovered 15 August 2003 from Mauna Kea, Hawaii, USA by W. J. Merline, P. M. Tamblyn, C. Dumas, L. M. Close, C. R. Chapman, and F. Menard, using the Keck II adaptive optics telescope.

See more information and links at Asteroid/Comet Connection Catchall Catalog page

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2003-2004, 2005 by Wm. Robert Johnston.
Last modified 2 September 2005.
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