4.19 Astro 1 Section 1 Professor Brandt

4.19 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Monday April 19th 1999 Announcements: Lecture notes: Class 42 Saturn Spacecraft studies. Pioneer II Voyager 1 Voyager 2. Mass and Density Again use moons to get mass - 95 Earth masses. now density is about 700 kg/m 3 again mostly H He but less He than Jupiter. 92.4%H 7.4% He. Rotation - Again differential rotation. Equator - 10h14m. High latitudes 10h 40m. Bulges at equator by 10% Again rocky core of about 15 Earth masses. Climate and atmosphere. Axial tilt is 27 degrees so expect seasons. Again have internal heating. 3x as much radiation emitted than arrives from sun. "liquid helium rain" causes this heating. Again has cloud layers. But now thicker than Jupiter 200km due to less gravitational scrunching. Due to this thickness we don't have as many holes so blander than Jupiter. Rings (Galileo observed in 1610) Can learn composition by stellar occultation and computer sims. Made of many snowballs and small rocks independently orbiting in equatorial plane. 400 000 km across but only a few meters thick. Actually several
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