4.23 Astro 1 Section 1 Professor Brandt

4.23 Astro 1 - Astro 1 Section 1 Professor Brandt Friday April 23th 1999 Announcements Lecture notes Lecture 42 Moons of Jupiter Jupiter has at

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Astro 1 Section 1 Professor Brandt Friday April 23th 1999 Announcements: Lecture notes: Lecture 42. Moons of Jupiter. Jupiter has at least 16 moons. Has 4 main moons known as the Galilean satellites since seen by Galileo. Io Europa Ganymede Callisto. Named after mythical attendants of Roman God Jupiter. Nearly circular orbits synchronous for all. Range from slightly smaller than Earth's moon to slightly larger than Mercury ( Ganymede) Also has lots of smaller moons. 4 inside Io's orbit. 8 outside Callisto's orbit. - The outer 8 probably captured as 2 bodies that broke up to make 8 moons. Galilean Moons Io Europa have rocky compositions. Ganymede Callisto deficient in rocky materials probably about 50% water ice. Io - most geologically active object in entire solar system. Surface looks like a giant pizza. Essentially no craters because always resurfacing itself. Being tidally stirred up inside by Jupiter's gravity - gets distorted inside - like repeatedly bending a wire. Europa's gravitational tugs won't let it circularize.
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This note was uploaded on 02/20/2008 for the course ASTRO 1 taught by Professor Brandt during the Spring '99 term at Pennsylvania State University, University Park.

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4.23 Astro 1 - Astro 1 Section 1 Professor Brandt Friday April 23th 1999 Announcements Lecture notes Lecture 42 Moons of Jupiter Jupiter has at

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