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Saturn: Ringed Wonder
Presented by
Professor Harold Geller
Department of Physics and Astronomy
George Mason University
What I’m Going to Talk About
• Saturn as a jovian planet– mass
– diameter
– distance from sun
– chemical constituents
– formation
– atmosphere
– inner layers
– rings
– moons
Saturn Statistics
• Distance from sun– 1427 million km (9.54 AU)
• Orbital eccentricity and inclination– 0.054 eccentricity
– 2.49 degrees inclination
• Orbital speed and period– 9.65 km/s
– 29.42 years - sidereal period
• Mass– 5.68 x 1026 kg (95.6 x Earth)
• Equatorial Diameter– 60,268 km (9.45 x Earth)
More Saturn Statistics
• Mean density– 0.687 g/cm3 (0.125 x Earth)
• Surface gravity– 10.4 m/s2 (1.07 x Earth)
• Escape velocity– 35.5 km/s
• Axial tilt– 26.7 degrees
• Temperature at cloud top– 97 K
• Number of Moons– Define a moon
Where Are We?
Jovians and Terrestrials
A Family Portrait scaled to size, NOT distance
[Source: James Schombert, University of Oregon]
Atmospheric Comparison
[Source: James Schombert, University of Oregon]
Not a Perfect Sphere
[Source: James Schombert, University of Oregon]
[Source: James Schombert, University of Oregon]
Atmospheric Appearance
•Fluid Mechanics•viscous flow•turbulent flow•eddies•cyclones
[Source: James Schombert, University of Oregon]
Saturn’s Interior
[Source: James Schombert, University of Oregon]
Saturn’s Magnetic Field
[Source: James Schombert, University of Oregon]
Saturn’s Magnetic Field•8,000 times Earth’s•1/2 of Jupiter’s•similar rotation
•therefore metallic hydrogen shell is smaller
Saturn’s Magnetosphere•smaller than Jupiter’s•large ring system “damps out” charged particles
Synchrotron Radiation
[Source: James Schombert, University of Oregon]
Saturn’s Aurora
[Source: James Schombert, University of Oregon]
Rings Rings Rings – NOT REAL COLOR
[Source: James Schombert, University of Oregon]
Rings around the Jovians
Ring Irregularities