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AST251H1 Lecture 10: AST 251 Lecture 10

68 views9 pages
magentaduck547
2 May 2012
School
UTSG
Department
Astronomy & Astrophysics
Course
AST251H1
Professor
H.Pfeiffer

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Document Summary

First discoveries: four main moons, galileo, 1610 io, ganymede, europa and callisto. Confirmation of kepler"s heliocentric solar system model if moon"s orbit around jupiter, then it doesn"t seem so absurd for the moon to orbit. Jupiter"s galilean moons: io, ganymede and callisto larger than the moon, but europa is almost the same size. Large jovian moons: ganymede and titan larger than mercury, several are larger than pluto, round through their gravity, orbit in equatorial plane of hot planet in same direction as planet"s rotation. Jovian planets formed as mini solar systems from small, gaseous disks orbiting the large solar proto-planetary nebula: exception: triton is on retrograde orbit likely captured kuiper belt object (like. Composition of jovian moons: mixture of rocks and ices, consistent with solar nebula model. Lower temperatures at larger distances: jupiter. Europa, ganymede, callisto decreasing density, increasing ice fraction. Io mostly rock (high density: saturn and beyond. Higher proportion of ice than jupiter"s moons.

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Related Questions

how does the largest asteroid, ceres, compare in size to other solar system worlds?

A) It is larger than Pluto and Mercury.

B) It is about the size of a large jovian moon.

C) It is about the size of Pluto.

D) It is about a quarter the size of the Moon.

E) It is smaller than any jovian moon

Ganymede is the largest of Jupiter's moons. Consider a rocket on the surface of Ganymede at a point farthest from the planet. Model the rocket as a particle. 
 
 
(a) Does the presence of Ganymede make Jupiter exert a larger, smaller, or same size force on the rocket compared with the force it would exert if Ganymede were not interposed? 
 
(b) Determine the escape speed for the rocket from the planet-satellite system. The radius of Ganymede is 2.64 x 106 m, and its mass is 1.495 x 1023 kg. The distance between Jupiter and Ganymede is 1.071 x 109 m, and the mass of Jupiter is 1.90 x 1027 kg. Ignore the motion of Jupiter and Ganymede as they revolve about their center of mass. 

 

The table gives the mean distance, period, and mass for the fourlargest moons of Jupiter (those discovered by Galileo in1609).
Principle Moons of JupiterMoon Mass (kg) Period
(Earth days) Mean distance
from Jupiter (km)
Io 8.9 multiplied by 1022 1.77 422 multiplied by 103
Europa 4.9 multiplied by 1022 3.55 671 multiplied by 103
Ganymede 15 multiplied by 1022 7.16 1070 multiplied by 103
Callisto 11 multiplied by 1022 16.7 1883 multiplied by 103

(a) Determine the mass of Jupiter using the data for Io.