90 Antiope

Antiope (minor planet designation: 90 Antiope) is a double asteroid in the outer asteroid belt. It was discovered on October 1, 1866, by Robert Luther. In 2000, it was found to consist of two almost-equally-sized bodies orbiting each other. At average diameters of about 88 km and 84 km, both components are among the 500 largest asteroids. Antiope is a member of the Themis family of asteroids that share similar orbital elements.

Discovery 
Discovered byRobert Luther
Discovery dateOctober 1, 1866
Designations
MPC designation
(90) Antiope
Pronunciation/ænˈtaɪəpiː/
Alternative designations
1952 BK2
Minor planet category
Main belt
(Themis family)
AdjectivesAntiopean
Orbital characteristics
Epoch July 23, 2010
(JD 2455400.5)
Aphelion545.94 Gm
3.6494 AU
Perihelion398.02 Gm
2.6606 AU
Semi-major axis
471.19 Gm
3.1550 AU
Eccentricity0.15670
Orbital period (sidereal)
2046.9 d (5.60 yr)
Average orbital speed
16.66 km/s
Mean anomaly
304.12°
Inclination2.2195°
Longitude of ascending node
70.21°
242.96°
Physical characteristics
Dimensions93.0×87.0×83.6 km
87.8 ± 1.0 km
Mass8.3×1017 kg
(whole system)
~ 4.1−4.2 ×1017 kg (components)
Mean density
1.25 ± 0.05 g/cm3 (each)
Synodic rotation period
0.687 d (16.50 h) (synchronous)
0.060
C
8.27 (together)
9.02 (each component)
    S/2000 (90) 1
    Discovery
    Discovered byW. J. Merline, L. M. Close,
    J. C. Shelton, C. Dumas,
    F. Menard, C. R. Chapman,
    and D. C. Slater
    Discovery dateAugust 10, 2000
    Designations
    Minor planet category
    		Main belt (Themis family)
    Orbital characteristics
    Semi-major axis
    		171 ± 1 km
    Eccentricity<0.006
    Orbital period (sidereal)
    		0.687713 ± 0.00004 d (16.5051 ± 0.0001 h)
    Average orbital speed
    		18.0 m/s
    Satellite ofBinary with 90 Antiope
    Physical characteristics
    Dimensions89.4×82.8×79.6 km
    Mean diameter
    		83.8 ± 1.0 km
    Mass~ 8.1−8.5 ×1017 kg
    Equatorial escape velocity
    		variable; ~ 35−40 m/s
    Synodic rotation period
    		0.687 d (16.50 h) (synchronous)
    9.02
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