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Ophelia
Moon· orbits Uranus
Ophelia is a moon orbiting Uranus.
Open in 3D viewSee Ophelia in the live, interactive 3D map
Key facts
Mass
3.57 × 10¹⁶ kg
0.000000486 Moon masses
Radius
21.4 km
1% of our Moon's radius
Orbit around Uranus
9.0 hours
0.38 Earth days
Science
Physical
- Mass
- 3.57 × 10¹⁶ kg · 0.000000486 Moon masses
- French et al. 2024, Icarus 411, 115957 — weighed from the amplitude of the γ ring's 6:5 wave and the ε ring's outer edge (±9%, 1σ); with the HST size this implies a density of 0.87 (+0.89/−0.30) g/cm³ View source ↗
- Radius (estimated)
- 21.4 km · 1% of our Moon's radius
- Sized from brightness and an assumed reflectivity, not a resolved disk. JPL Horizons still lists 16 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 0.87 (+0.89/−0.30) g/cm³ — the same mass against the older size would imply 2.1 g/cm³.
Orbit around Uranus
- Distance from Uranus
- 53,765 km
- From JPL orbital elements
- Orbital period
- 9.05 hours
- From JPL orbital elements
- Eccentricity
- 0.011
- From JPL orbital elements
- Inclination to Uranus's Laplace plane
- 0.20 °
- 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
Ophelia 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
Images from open archives · credit shown per image