ASTRON 103 Study Guide - Final Guide: Lunar Mare, Roche Limit, Flattening

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11 Apr 2018
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Questions on the Final:
The moon receding from earth powerpoint: tidal bulges
Mercury eccentricity and orbital and rotation period
Eccentricity: 0.206
Orbital Period: 87.969 days
Rotational Period: 58.646 days
Radar measurements via the doppler effect measure the spin of a planet (as with Venus)
500m years as surface of venus has only 15% the number of craters as the lunar maria
Venus undergoes “flake” tectonics where convection is much more intense and surfaces
brakes into flakes
Why the sun not rotating as fast as Jupiter? Ans: Bc the sun is constantly slowing down
due to the winds excreting from the star
What is the chemical composition of the atmosphere of Jupiter? Ans: Hydrogen, helium,
methane, ammonia and water. Brown color comes from ammonia
(Gas giants have their own source of heating. Light from sun gets absorbed and radiates
back, much more radiation coming from Jupiter and Saturn then standard radiation from
the sun. Energy must be fed in order to keep storms alive. Not on test.)
How do you measure the mass of Saturn? Ans: When talking about mass of object
means that something else is orbiting it. By Kepler’s laws and the gravity of the planet.
This just means that one would observe Saturn’s moons.
Two ingredients to generate strong magnetic field on a surface: high internal pressure
with hydrogen in a metallic state. Temperature and pressure is extremely high with a lot
of hydrogen.
Saturn’s rings do not move constantly in unison. All the objects in the rings move
individually according to Kepler’s laws
Roche Limit is a radius at which a moon gets destructed. Effects moons or large objects,
not objects like the size of a human. Will never happen to Earth because the moon is
slowly moving away from Earth.
Shepherding moons: very small moons? Cassini?: look around Saturn moon powerpoint
right before The Galilean Satellites slide
Shepherd moons are just ordinary moons: there is nothing special about
them other than being in the right place to cause this effect. Shepherd
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