Cressida (moon) facts for kids

Kids Encyclopedia Facts
Cressida
Discovery
Discovered by Stephen P. Synnott / Voyager 2
Discovery date January 9, 1986
Names
Orbit
Avgdistance from the center of its orbital path 61,766.730 ± 0.046 km
How long it takes to complete an orbit 0.463569601 ± 0.000000013 d
Angle above the reference plane
("inclination")
0.006 ± 0.040° (to Uranus' equator)
What it orbits Uranus
Size and other qualities
Measurements 92 × 74 × 74 km
Average radius 41 ± 2 km
Surface area ~20,000 km²
Volume ~260,000 km³
Mass ~3.4×1017 kg
Average density ~1.3 g/cm³ (assumed)
Surface gravity ~0.013 m/s2
Escape velocity ~0.034 km/s
Rotation period synchronous
Angle at which it turns
(in relation to its orbit)
zero
How much light it reflects 0.08 ± 0.01
Avg. surface temp. ~64 K
Uranus-Portia-Cressida-Ophelia-NASA

Cressida is a closer moon to Uranus. It was found from the images taken by Voyager 2 on 1986-01-09, and was given the designation S/1986 U 3. 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.

Cressida belongs to Portia Group of moons, which also includes Bianca, Desdemona, Juliet, Portia, Rosalind, Cupid, Belinda and Perdita. These moons have similar orbits and photometric properties. Other than its orbit, radius of 41 km and geometric albedo of 0.08 almost nothing is known about it.

At the Voyager 2 images Cressida appears as a stretched object, the major axis pointing towards Uranus. The ratio of axises of the Cressida's prolate spheroid is 0.8 ± 0.3. Its surface is grey in color.


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