Clea Home Page  THE REVOLUTION OF THE MOONS OF JUPITER  Please sign our mailing list

Required Windows Software

Click Filename to Download
Or Icon to Go to FTP Site.  The file is a self-
extracting file, and will install itself if you run
it on your computer.

User's guide (Acrobat pdf format)

Student manual (Acrobat pdf format)

Questionnaires and Pre/Post-Tests 
(Acrobat pdf format)

A Description of the Lab: 
Purpose: To illustrate the measurement of the mass of a planet using Kepler's third law.

The software provides a view of Jupiter at four magnifications (actual Voyager images are used), along with a highly accurate ephemeris program that draws the four Galilean satellites in their proper positions relative to the planet at any time. Students make observations of Jupiter and its satellites at regular intervals over a period of several weeks and, by graphing the separation of each moon from Jupiter versus time, they measure the period and radius of each satellite's orbit. This is sufficient information to derive the mass of Jupiter. Students use the mouse cursor to identify the moons and to measure distances. A cloudy night feature provides some incompleteness to the data. Instructor-settable options set the percentage of "cloudy" days, suppress the automatic moon identification, and suppress the automatic calculation of distance from the planet. 


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