Cressida (moon)

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There is also an asteroid called 548 Kressida.
Cressida
Cressida
Voyager 2 image of the Uranian moons Portia, Cressida, and Ophelia
Discovery
Discovered by Stephen P. Synnott / Voyager 2
Discovery date January 9, 1986
Orbital characteristics
Mean orbit radius
 61,766.730 ± 0.046 km[1]
Eccentricity 0.00036 ± 0.00011[1]
0.463569601 ± 0.000000013 d[1]
Inclination 0.006 ± 0.040° (to Uranus' equator)[1]
Satellite of Uranus
Physical characteristics
Dimensions 92 × 74 × 74 km[2]
Mean radius
 39.8 ± 2 km[2][3][4]
~20,000 km²[lower-alpha 1]
Volume ~260,000 km³[lower-alpha 1]
Mass ~3.4×1017 kg[lower-alpha 1]
Mean density
 ~1.3 g/cm³ (assumed)[3]
~0.013 m/s2[lower-alpha 1]
~0.034 km/s[lower-alpha 1]
synchronous[2]
zero[2]
Albedo <templatestyles src="Plainlist/styles.css"/>
Temperature ~64 K[lower-alpha 1]

Cressida (/ˈkrɛsᵻdə/ KRES-i-də, Greek: Χρησίδα) is an inner satellite of Uranus. It was discovered from the images taken by Voyager 2 on 9 January 1986, and was given the temporary designation S/1986 U 3.[6] It was named after Cressida, the Trojan daughter of Calchas, a tragic heroine who appears in William Shakespeare's play Troilus and Cressida (as well as in tales by Geoffrey Chaucer and others). It is also designated Uranus IX.[7]

Cressida belongs to the Portia Group of satellites, which includes Bianca, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda and Perdita.[5] These satellites have similar orbits and photometric properties.[5] Other than its orbit,[1] radius of 41 km[2] and geometric albedo of 0.08,[5] virtually nothing is known about it.

In the Voyager 2 images Cressida appears as an elongated object, its major axis pointing towards Uranus. The ratio of axes of Cressida's prolate spheroid is 0.8 ± 0.3.[2] Its surface is grey in color.[2]

Cressida may collide with Desdemona within the next 100 million years.[8]

See also

References

Explanatory notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Calculated on the basis of other parameters.

Citations

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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