| Saturn |
Earth |
Ratio (Saturn/Earth) |
|
|---|---|---|---|
| Mass (1024 kg) | 568.32 | 5.9722 | 95.16 |
| Volume (1010 km3) | 82,713 | 108.321 | 763.59 |
| Equatorial radius (1 bar level) (km) | 60,268 | 6,378.1 | 9.449 |
| Polar radius (1 bar level) (km) | 54,364 | 6,356.8 | 8.552 |
| Volumetric mean radius (km) | 58,232 | 6,371.0 | 9.140 |
| Ellipticity (Flattening) | 0.09796 | 0.00335 | 29.24 |
| Mean density (kg/m3) | 687 | 5,513 | 0.125 |
| Gravity (mean, 1 bar) (m/s2) | 11.19 | 9.82 | 1.140 |
| Acceleration (eq., 1 bar) (m/s2) | 8.96 | 9.78 | 0.916 |
| Acceleration (pole, 1 bar) (m/s2) | 12.14 | 9.83 | 1.235 |
| Escape velocity (km/s) | 35.5 | 11.19 | 3.172 |
| GM (x 106 km3/s2) | 37.931 | 0.39860 | 95.16 |
| Bond albedo | 0.342 | 0.294 | 1.16 |
| Geometric albedo | 0.499 | 0.434 | 1.15 |
| V-band magnitude V(1,0) | -8.91 | -3.99 | - |
| Solar irradiance (W/m2) | 14.82 | 1,361.0 | 0.011 |
| Black-body temperature (K) | 81.0 | 254.0 | 0.319 |
| Moment of inertia (I/MR2) | 0.210 | 0.3308 | 0.635 |
| J2 (x 10-6) | 16,298. | 1082.63 | 15.054 |
| Number of natural satellites | 146 | 1 | |
| Planetary ring system | Yes | No |
| Saturn |
Earth |
Ratio (Saturn/Earth) |
|
|---|---|---|---|
| Semimajor axis (106 km) | 1,432.041 | 149.598 | 9.573 |
| Sidereal orbit period (days) | 10,755.699 | 365.256 | 29.447 |
| Tropical orbit period (days) | 10,746.940 | 365.242 | 29.424 |
| Perihelion (106 km) | 1,357.554 | 147.095 | 9.229 |
| Aphelion (106 km) | 1,506.527 | 152.100 | 9.905 |
| Synodic period (days) | 378.09 | - | - |
| Mean orbital velocity (km/s) | 9.67 | 29.78 | 0.325 |
| Max. orbital velocity (km/s) | 10.14 | 30.29 | 0.335 |
| Min. orbital velocity (km/s) | 9.14 | 29.29 | 0.312 |
| Orbit inclination (deg) | 2.486 | 0.000 | - |
| Orbit eccentricity | 0.0520 | 0.0167 | 3.114 |
| Sidereal rotation period (hrs) | 10.656* | 23.9345 | 0.445 |
| Length of day (hrs) | 10.656 | 24.0000 | 0.444 |
| Obliquity to orbit (deg) | 26.73 | 23.44 | 1.140 |
Discoverer: Unknown
Discovery Date: Prehistoric
Distance from Earth
Minimum (106 km) 1205.5
Maximum (106 km) 1658.6
Apparent diameter from Earth
Maximum (seconds of arc) 19.9
Minimum (seconds of arc) 14.5
Mean values at opposition from Earth
Distance from Earth (106 km) 1277.13
Apparent diameter (seconds of arc) 18.8
Apparent visual magnitude 0.7
Maximum apparent visual magnitude 0.43
Mean values at opposition including rings
Apparent visual magnitude 0.05
Maximum apparent visual magnitude -0.55
Semimajor axis (AU) 9.53707032 Orbital eccentricity 0.05415060 Orbital inclination (deg) 2.48446 Longitude of ascending node (deg) 113.71504 Longitude of perihelion (deg) 92.43194 Mean Longitude (deg) 49.94432
Right Ascension: 40.589 - 0.036T Declination : 83.537 - 0.004T Reference Date : 12:00 UT 1 Jan 2000 (JD 2451545.0) T = Julian centuries from reference date
Dipole field strength: 0.215 Gauss-Rs3
Dipole tilt to rotational axis: 0.0
Dipole offset: 0.038 Rs
Surface (1 Rs) field strength: 0.18 - 0.84 Gauss
Saturn's magnetic field has significant quadrapole and octapole moments,Surface Pressure: >>1000 bars Temperature at 1 bar: 134 K (-139 C) Temperature at 0.1 bar: 84 K (-189 C) Density at 1 bar: 0.19 kg/m3 Wind speeds Up to 400 m/s (<30 degrees latitude) Up to 150 m/s (>30 degrees latitude) Scale height: 59.5 km Mean molecular weight: 2.07 Atmospheric composition (by volume, uncertainty in parentheses) Major: Molecular hydrogen (H2) - 96.3% (2.4%); Helium (He) - 3.25% (2.4%) Minor (ppm): Methane (CH4) - 4500 (2000); Ammonia (NH3) - 125 (75); Hydrogen Deuteride (HD) - 110 (58); Ethane (C2H6) - 7 (1.5) Aerosols: Ammonia ice, water ice, ammonia hydrosulfide
Notes on the factsheets
- definitions of parameters, units, notes on sub- and superscripts, etc.
Saturnian Satellite Fact Sheet
Saturnian Rings Fact Sheet
Planetary Fact Table
- metric units
Planetary Fact Table
- U.S. units
Planetary Fact Table
- Earth ratio
Saturn Home Page
Directory to other Planetary Fact Sheets
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