Enceladus

Image source: Astrobioloblog



Enceladus the brightest satellite of Saturn, also named Saturn II was discovered by William Herschel in August 28, 1789

Orbital characteristics:
Semi-major axis 237,948 km
Eccentricity 0.004 7
Orbital period 1.370 218 days or 118,386.82 seconds
Inclination 0.019° (to Saturn's equator)

Proper orbital elements
Physical characteristics:

Dimensions 513.2×502.8×496.6 km
Mean radius 252.1 ± 0.2 km (0.0395 Earths)
Mass (1.080 22 ± 0.001 01)×1020 kg (1.8×10−5 Earths)
Mean density 1.609 ± 0.005 g/cm3
Equatorial surface gravity 0.114 m/s2 (0.011 3 g)
Escape velocity 0.239 km/s (860.4 km/h)
Rotation period synchronous
Axial tilt zero
Albedo 1.375 ± 0.008 (geometric) or 0.99 (Bond)[8]
Surface temp. Kelvin
min mean max
32.9 K 75 K 145 K

Apparent magnitude 11.7
Atmosphere
Surface pressure trace, significant spatial variability
Composition 91% Water vapour
4% Nitrogen
3.2% Carbon dioxide
1.7% Methane

Geyser eruption on Enceladus

| la 4:10 PM

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