Semi major axis

  • #1
ghostbuster25
102
0
my question is... the semimajor axis of the orbit of Jupiter is 7.8*108.
If an asteroid has an orbital period half of that of Jupiter what is the semi major axis?

All i did was times 7.8*108 by 1/2 and got 3.9*108.

Seems to simple!??

any comments much appreciated
 

Answers and Replies

  • #2
D H
Staff Emeritus
Science Advisor
Insights Author
15,450
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What does Kepler's third law say?
 
  • #3
ghostbuster25
102
0
that the square of the orbital period is propotional to the square of the semi major axis.

im unsure of how to apply this though.

I believe T2/a3=K to be relivent but as i only know that the semi major of the sun and Jupiter is 7.8*108 I am confused what to do next
 

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