(90) Antiope and S/2000 (90) 1

compiled by Wm. Robert Johnston
last updated 23 November 2008

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: 3.15597769715443 AU
orbital period P: 5.6067 y (=2047.9 d)
eccentricity e: 0.155943528304158
perihelion distance q: 2.66382339981093 AU
aphelion distance Q: 3.64813199 AU
inclination i: 2.21979825482584°
argument of perihelion omega: 242.480177008978°
ascending node OMEGA: 70.2345555841853°
mean anomaly M: 348.378454301017°
perihelion passage TP: 2005-10-23.1090184
Epoch: 18 AUG 2005
data arc: 1866-2005 (898 obs.)

orbital data, secondary:
semimajor axis a: 171 ± 1 km [D07c]
semimajor axis/primary radius a/Rp: (3.90)
orbital period P: 16.5051 ± 0.0001 h [D07c]
eccentricity e: <0.006 [D07c]
inclination i: 63.7° ± 2° [D07c]

other data, primary:
diameter (mean): 87.8 ± 1.0 km [D07c]
triaxial dimensions a, b, c: 93.0 km x 87.0 km x 83.6 km [D07c]
absolute magnitude H: 8.27 [JPL]
rotation period: 16.5051 ± 0.0001 h [D07c]
amplitude delta M: 0.7 [MPb]
color index U-B: 0.317 ± 0.047 [SBa]
color index B-V: 0.688 ± 0.016 [SBa]
color index V-R: ?
color index R-I: ?
slope parameter G: (0.15) assumed
geometric albedo: 0.060 ± 0.004 [IR]
mass (system): (8.28 ± 0.22)x1017 kg [D07c]
density (system): 1.25 ± 0.05 g/cm3 [D07c]
type: C [SBd]

other data, secondary:
diameter (mean): 83.8 ± 1.0 km [D07c]
triaxial dimensions a, b, c: 89.4 km x 82.8 km x 79.6 km [D07c]
diameter ratio Ds/Dp: 0.95 ± 0.01 [D07c]
component magnitude difference: <=0.1 [I7503]
rotation period: 16.5051 ± 0.0001 h [D07c]
density (system): 1.25 ± 0.05 g/cm3 [D07c]

--(90) Antiope--discovery and notes:

Primary discovered 1 November 1866 from Dusseldorf, Germany, by R. Luther. Alternate designation 1952 BK2.

Companion discovered 10 August 2000 from the Keck II adaptive optics telescope by W. J. Merline, L. M. Close, J. C. Shelton, C. Dumas, F. Menard, C. R. Chapman, and D. C. Slater; announced 3 October 2000.

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

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2001-2007, 2008 by Wm. Robert Johnston.
Last modified 23 November 2008.
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