4.16 Astro 1 Section 1 Professor Brandt

4.16 Astro 1 Section 1 Professor Brandt - Astro 1 Section 1...

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Astro 1 Section 1 Professor Brandt Friday April 16th 1999 Announcements: Lecture notes: Class 41. Jupiter. Can learn mass from how the moons orbit - use laws of gravity Very massive = about 317 Earth masses. Over 2X mass of all other planets combined. But still 1000 times less than Sun. Sun and Jupiter - all else is debris. Get radius from angular size (71000 km). Then solve for density. 1300 kg/m 3 much less terrestrial planet. Tells you not rocks - gas giant. 86% H by mass 14% He by mass. trace other things. Rotation. Can watch features move. See differential rotation - not like Earth. Equator is faster ( 9h 50m) higher latitudes are 9h 56m. Can do this because it is fluid. Sun also rotates this way. 15M Earth core of Jupiter rotates like a solid body every 9h 56m. Know this from measurements in radio. Since magnetic field is frozen into core. Bulges at the equator by 6.5% due to rotation. Climate and atmosphere. Tilt of Jupiter's equator from orbital plane only 3 degrees. No seasons.
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