Cressida (moon)
From Wikipedia, the free encyclopedia
- There is also an asteroid called 548 Kressida.
 Voyager 2 image of the Uranian moons Portia, Cressida, and Ophelia |
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| Discovery | |
|---|---|
| Discovered by: | Stephen P. Synnott / Voyager 2 |
| Discovery date: | January 9, 1986 |
| Orbital characteristics | |
| Mean radius of orbit: | 61,767 km |
| Eccentricity: | 0.00023 |
| Orbital period: | 0.46357 d |
| Inclination: | 0.038° (to Uranus' equator) |
| Satellite of: | Uranus |
| Physical characteristics | |
| Dimensions: | 92 × 74 km [1] |
| Surface area: | ~20,000 km² (estimate) |
| Volume: | ~260,000 km³ (estimate) |
| Mass: | ~3.4×1017 kg (estimate) |
| Mean density: | ~1.3 g/cm³ (estimate) |
| Equatorial surface gravity: | ~0.013 m/s2 (estimate) |
| Escape velocity: | ~0.034 km/s (estimate) |
| Rotation period: | synchronous (assumed) |
| Axial tilt: | zero (assumed) |
| Albedo: | 0.07 (assumed) |
| Temperature: | ~64 K (estimate) |
Cressida (kres'-ə-də, IPA: [ˈkrɛsədə]) is an inner satellite of Uranus. It was named after 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.[2]
It was discovered from the images taken by Voyager 2 on 1986-01-09, and was given the temporary designation S/1986 U 3.[3]
Other than its size and orbit, virtually nothing is known about it.
[edit] References
- ^ Karkoschka, Erich (2001). "Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope". Icarus 151: 51–68. DOI:10.1006/icar.2001.6596. Retrieved on 2006-08-05.
- ^ Planet and Satellite Names and Discoverers. Gazetteer of Planetary Nomenclature. USGS Astrogeology (July 21, 2006). Retrieved on 2006-08-06.
- ^ Smith, B. A. (January 16, 1986). IAU Circular No. 4164. Retrieved on 2006-08-06.
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| Inner | Cordelia · Ophelia · Bianca · Cressida · Desdemona · Juliet · Portia · Rosalind · Cupid · Belinda · Perdita · Puck · Mab |
| Major (spheroid) | Miranda · Ariel · Umbriel · Titania · Oberon |
| Outer (irregular) | Francisco · Caliban · Stephano · Trinculo · Sycorax · Margaret · Prospero · Setebos · Ferdinand |
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See also Rings of Uranus
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