Astr. 101 Notes 8

Astr. 101 Notes 8 - -calculating surface temperature: T...

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-calculating surface temperature: T (sub solar)=393 K x (1-albedo)^(1/4) x (Distance/1 AU)^ (-1/2) -escape velocity and gas temperature-the hotter a planet’s atmosphere, the faster its molecules move; molecules actually move over a range of speeds; if the faster moving molecules are moving faster than the escape speed they will escape into space; eventually nearly all of that type of molecule will escape (how fast is too fast? as a rule of thumb, if 6 x avg. molecular speed is greater than the escape speed, nearly all of that type of molecule will be lost into space) -comets and asteroids: -largest asteroid-Ceres, but still significantly smaller than the Moon; often show up as “surprises” in astronomical images; some, but not all, orbit in the asteroid belt -Kirkwood gaps-regions in asteroid belt where there are relatively few asteroids (due largely to gravitational pull of Jupiter) -most asteroids orbit the Sun in a belt about 1.5 AU wide b/w the orbits of Mars and Jupiter (the asteroid belt) -asteroid menagerie-low densities and large craters suggest many asteroids are rubble piles -some asteroids have moons-sometimes collisions of asteroids lead to some pieces getting thrown into orbit -Trojans in Jupiter’s Lagrange points-asteroids captured in Jupiter’s Lagrange points orbit w/ the same period as Jupiter, and are equidistant from Jupiter and the Sun and thus orbit
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This note was uploaded on 05/13/2011 for the course ASTR 101 taught by Professor Christiansen during the Spring '08 term at UNC.

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Astr. 101 Notes 8 - -calculating surface temperature: T...

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