Tethys

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Tethys
Tethys is a mid-sized moon of Saturn about 1,060 km across. It was discovered by G. D. Cassini in 1684 and is named after the titan Tethys of Greek mythology. Tethys has a low density of 0.98 g/cm3, the lowest of all the major moons in the Solar System, indicating that it is made of water ice with just a small fraction of rock. The surface of Tethys is very bright, being the second-brightest of the moons of Saturn after Enceladus, and neutral in color. Tethys (moon) - Wikipedia, the free encyclopedia
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Short Description Tethys is a mid-sized moon of Saturn about 1,060 km across. It was discovered by G. D. Cassini in 1684 and is named after the titan Tethys of Greek mythology. Tethys has a low density of 0.98 g/cm3, the lowest of all the major moons in the Solar System, indicating that it is made of water ice with just a small fraction of rock. The surface of Tethys is very bright, being the second-brightest of the moons of Saturn after Enceladus, and neutral in color. Tethys (moon) - Wikipedia, the free encyclopedia
Discovered by G. D. Cassini
Discovery date March 21, 1684
Type Moon
AddInfo Saturn III
Satellite of Saturn
Orbit Prograde
Rotation Synchronous
Shape Equilibrium spheroid
Geological activity In the past
Apoapsis 06 294 648 km
Periapsis 06 294 589 km
Semi-major axis 06 294 619 km
Distance from Sun 01 9.554 909 au /15
Eccentricity 0.000 1
Orbital period 1.887 802 day
Orbital speed 02 11.35 km/s
Inclination to the equator 001.12°
Diameter/Size 04 1062 ± 1.2 km | 0.30 Moons
Dimensions 1076.8 × 1057.4 × 1052.6 km
Mass 1020×6.17449 kg | 0.008 Moons
Density  0.984 g/cm3
Surface gravity  0.146 m/s2
Escape velocity 03 394 m/s
Rotation period 1.887 802 day
Axial tilt
Albedo Bond 0.80
Albedo geometric 1.229
Temperature mean 02 86 ± 1 K | −187 ± 1 °C
Apparent magnitude 10.2
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