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Saturn

1.16. Numerical Data (Part 2)

Saturn Observational Parameters

Distance from Earth min max	1195.5 x 1012m 1658.5 x 109m
Apparent diameter from Earth Maximum Minimum	20.1 seconds of arc 14.5 seconds of arc
Apparent magnitude at opposition	0.7

Saturn Mean Orbital Elements

Semi Major Axis	9.53707032 AU
Longitude of Ascending Node	113.71504 degrees
Longitude of Pelihedron	92.43194 degrees
Mean Longitude	49.94432 degrees

Saturnian Magnetosphere

Dipole Field Strength	0.218 gauss - Rs3 4.70 x 10 28cm3
Dipole Tilt to Rotational Axis	0.7 degrees
Dipole Offset (planet centre to dipole centre) distance	0.04 to 0.05 Rs* northward

*Rs is the radius of Saturn: 60330 km

Saturnian Atmosphere

Surface Pressure	<< 100 bars
Average Temperature	~ 97 K
Temperature at 1 Bar	~ 134 K
Density at 1 Bar	~ 0.19kg/m3
Windspeed	Up to ~ 400 m/s (< 30 degrees latitude) Up to ~ 150 m/s (> 30 degrees latitude)
Scale height	5.95 X 104m
Mean molecular Weight	2.07 g/mol

Atomosphere Composition

(uncertainty in parentheses)

Major	H2 - 96.3% (2.4 %) He 3.25% (2.4 %)
Minor (in PPM)	Methane CH4 4500 (2000) Ammonia NH3 125 (75) Hydrogen Detoured (HD) 110 (58) Ethane C2H6 7 (1.5)
Aerosols	Amonia Ice, Water Ice, Ammonia Hydrosulphide

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