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Tethys

Tethys Moon Pisces Visible Level 6 Professional/Research - Timing dependent
Credit: Justin Cowart. License: Public domain. (Wikimedia Commons)
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Properties

Magnitude 10.3
Angular Size 0.2 arcmin
Type: Moon
Distance: 0.002 AU
Orbital Period: 1.9 days
Diameter: 1,066 km
Features: Odysseus crater, Ithaca Chasma
Icy moon with massive Odysseus crater spanning 400 km. Part of Saturn's 'major four' moons. Visible in 3-4 inch telescopes.

Position & Identifiers

RA 00h 21m 10.4s
Dec -00° 02' 00.0"
Constellation Pisces
Catalog Tethys
Tethys — NASA/JPL
Image: NASA/JPL · PIA21613

Physical Properties

Diameter 1,066 km (0.08× Earth)
Mass 6.17e20 kg
Albedo 0.80 (80% reflected)
Temperature -220°C to -187°C
Rotation 45.3 hours
Surface Odysseus crater, Ithaca Chasma
Angular Size 0.1″ (current)

Orbital Properties

Semi-major Axis 0.0020 AU (294,558 km)
Eccentricity 0.0001
Inclination 1.12°
Orbital Period 1.9 days
Distance 10.517 AU (1.46 light-hours)
Elongation 2.4° Near Sun

Observing Tips

Best Months April , May , June
Visibility Telescope
Where to Look Near Saturn
Notes Icy moon with massive Odysseus crater spanning 400 km. Part of Saturn's 'major four' moons. Visible in 3-4 inch telescopes.

Parent Body

Orbits Saturn
Orbital Period 1.89 days
Distance 294,558 km

Discovery

Discovered by Giovanni Cassini
Date 1684-03-21

Current Ephemeris

10.517
AU from Earth
1.57B
km
0.1″
Angular Size
2°
Elongation

Visibility

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Community Photos (1)

Credit: Justin Cowart. License: Public domain. (Wikimedia Commons)

Credit: Justin Cowart. License: Public domain. (Wikimedia Commons)

Skybred Feb 28, 2026