Reference image
Object guide
Tethys is an icy moon with large impact features and a relatively low density indicating a composition dominated by water ice. Tethys is approximately 1,062.2 km across.
How to observe Tethys
Tethys is resolved as a separate world mainly through imaging or spacecraft data; visually, its relationship to saturn is the key observing context.
Scientific context
Useful scale comparisons are 0.083 Earth diameters, 0.015 g surface gravity, 0.005 Earth years per orbit. These values are rounded from the catalogue measurements shown on this page.
- Radius
- 531.1 km
- Diameter
- 1,062.2 km
- Mass
- 617,400,000,000,000,000,000 kg
- Mean density
- 0.984 g/cm³
- Surface gravity
- 0.145 m/s² (0.015 g)
- Orbital period
- 1.8888 days (0.005 years)
- Parent body
- saturn
0.083 Earth diameters0.015 g surface gravity0.005 Earth years per orbit
Source: NASA Science (checked 2026-08-09). Values are rounded catalogue measurements.
Interactive orbit model
Aug 13, 2026, 22:251×
Calculated positions / separate exploration scales