Cressida
Moon· orbits Uranus
Cressida — moon of Uranus.
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Key facts
Mass
1.84 × 10¹⁷ kg
0.0000025 Moon masses
Radius
39.8 km
2% of our Moon's radius
Orbit around Uranus
11.1 hours
0.46 Earth days
Science
Physical
- Mass
- 1.84 × 10¹⁷ kg · 0.0000025 Moon masses
- French et al. 2024, Icarus 411, 115957 — weighed from the amplitude of the 3:2 wave it raises in the η ring (±12%, 1σ); with the HST size this implies a density of 0.70 (+0.44/−0.21) g/cm³ View source ↗
- Radius (estimated)
- 39.8 km · 2% of our Moon's radius
- Sized from brightness and an assumed reflectivity, not a resolved disk. JPL Horizons still lists 33 km; this is Karkoschka's later HST value, and the size French et al. (2024) pair with the ring-wave mass for a density of 0.70 (+0.44/−0.21) g/cm³ — the same mass against the older size would imply 1.2 g/cm³.
Orbit around Uranus
- Distance from Uranus
- 61,770 km
- From JPL orbital elements
- Orbital period
- 11.15 hours
- From JPL orbital elements
- Eccentricity
- 0.004
- From JPL orbital elements
- Inclination to Uranus's Laplace plane
- 1.80 °
- From JPL orbital elements · The Laplace plane is the one a moon's orbit precesses about: close in it is the planet's equatorial plane, the plane of the rings, and further out it tilts toward the planet's own orbit.
Radiation & temperature
- Insolation
- 0.00265 S⊕ · 1/378 of the sunlight Earth receives
- Computed from the distance to the Sun (inverse-square; Earth's sunlight = 1), before any atmosphere.
Discovery & history
- By
- Voyager Science Team
Cressida was discovered in 1986 by Voyager Science Team. Uranus's moons are named after characters from the plays of Shakespeare and the poetry of Alexander Pope. Beyond its discovery and naming, little more about it has been individually recorded.
Images
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