Jupiter’s Moons

Which Direction is Each Moon Moving?

1. Sketch image 1jup020122a_0102.fts

What happens to the Moons During Nine Hours?

2. How does the Subtract command help you see direction?

Making an Eight Hour Exposure

3. What is the total time span from image 1jup to 9jup? Why is this different than the number of images?

Analyzing the Image

4. Record the average speed for each moon.

Moon Number

Average Speed

Moving toward or away from Jupiter

5. In analyzing your data you should have found that the speed seemed to change. This is particularly true for one of the moons. How do you explain this paradox?

6. Top view of Jupiter and its moons.

Interpreting Your Data

7. Name of moon 1 __________________ Name of moon 2 __________________

Name of moon 3 __________________ Name of moon 4 __________________

8. Explain how you decided on the name of each moon.