Body diameters to scale. Positions and surface artwork are illustrative; Saturn’s rings are excluded.
A change of perspective
8.0758× the diameter. See how the two worlds measure up.
Diameter is a distance across an object. Volume grows with the cube of that distance.
Choose a size to bring this comparison down to Earth.
Titania: Twice JPL's volume-equivalent mean radius of 788.9 km: diameter = 1,577.8 km. The listed radius sigma of 1.8 km implies a diameter sigma of 3.6 km. This represents an equal-volume sphere, rather than an equatorial, polar or longest-axis measurement.
Earth: Twice the source mean radius; body diameter only, excluding rings.
Twice JPL's volume-equivalent mean radius of 788.9 km: diameter = 1,577.8 km. The listed radius sigma of 1.8 km implies a diameter sigma of 3.6 km. This represents an equal-volume sphere, rather than an equatorial, polar or longest-axis measurement.
Titania, a moon of Uranus, has a mean diameter of about 1,578 km. The adopted value comes from doubling the mean radius in JPL's satellite physical parameters, which credits Archinal and colleagues (2018) for the radius.
JPL's mean radius for Earth's Moon gives a diameter of 3,474.8 km. Dividing 1,577.8 by 3,474.8 gives approximately 0.454: Titania is about 45% as wide. Both inputs use the same mean-radius convention. Source: JPL.
If the Moon were a circle 10 cm across, Titania would be about 4.54 cm across at the same scale. This compares linear width; it does not describe mass, orbital distance or apparent size in the sky.
The uncertainty means the decimal place is not a claim of exactness. Artwork is illustrative; use the numerical diameter for scale. For consistent comparisons, check whether each object's value describes a mean diameter, an equatorial or polar diameter, or the dimensions of an irregular body. Read the measurement methodology.