90 Antiope

Discovery [1]
Discovered byRobert Luther
Discovery date1 October 1866
Designations
(90) Antiope
Pronunciation/ænˈtaɪəpiː/[1]
1952 BK2[2]
Main belt[2]
(Themis family)
AdjectivesAntiopean
Orbital characteristics[2]
Epoch 23 July 2010
(JD 2455400.5)
Aphelion545.94 Gm
3.6494 AU
Perihelion398.02 Gm
2.6606 AU
471.19 Gm
3.1550 AU
Eccentricity0.15670
2046.9 d (5.60 yr)
16.66 km/s
304.12°
Inclination2.2195°
70.21°
242.96°
Physical characteristics
Dimensions93.0×87.0×83.6 km[3]
87.8 ± 1.0 km[3]
Mass8.3×1017 kg
(whole system)[4]
~ 4.1−4.2 ×1017 kg (components)
Mean density
1.25 ± 0.05 g/cm3 (each)[5]
0.687 d (16.50 h)[6] (synchronous)
0.060[7]
C[8]
8.27 (together)[2]
9.02 (each component)
S/2000 (90) 1
Discovery[9]
Discovered byW. J. Merline, L. M. Close,
J. C. Shelton, C. Dumas,
F. Menard, C. R. Chapman,
and D. C. Slater
Discovery date10 August 2000[10]
Designations
Main belt (Themis family)
Orbital characteristics[4]
171 ± 1 km
Eccentricity<0.006
0.687713 ± 0.00004 d (16.5051 ± 0.0001 h)
18.0 m/s
Satellite ofBinary with 90 Antiope
Physical characteristics
Dimensions89.4×82.8×79.6 km[3]
83.8 ± 1.0 km[3]
Mass~ 8.1−8.5 ×1017 kg[5]
Equatorial escape velocity
variable; ~ 35−40 m/s
0.687 d (16.50 h)[6] (synchronous)
9.02

90 Antiope is a double asteroid in the outer asteroid belt. It was discovered on 1 October 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.[11]

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^ a b c d Cite error: The named reference jpldata was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference johnston was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Marchis was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Des07 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference MicBarVel04 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference IRAS was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference PDS tax was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference IAUC7503 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Keck2000 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Moore2011 was invoked but never defined (see the help page).