Calculating orbital velocity

  • Thread starter ZedCar
  • Start date
  • #1
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Homework Statement



If calculating the orbital velocity of an asteroid at perihelion I use:

Vp = {GM/a ((1+e)/(1-e))}^0.5

Is the G the gravitational constant G = 6.67x10^-11
Is M the mass of the sun = 1.988x10^30 kg
Is 'a' the mean distance of the asteroid from the Sun in metres/km/AU ?

Thank you.

Homework Equations





The Attempt at a Solution

 
Last edited:

Answers and Replies

  • #2
gneill
Mentor
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2,866

Homework Statement



If calculating the orbital velocity of an asteroid at perihelion I use:

Vp = {GM/a ((1+e)/(1-e))}^0.5

Is the G the gravitational constant G = 6.67x10^-11
Is M the mass of the sun = 3.518 x 10^8 kg
Is 'a' the mean distance of the asteroid from the Sun in metres/km/AU ?
Choose meters if you want the result in m/s, and use M in kg and G in m3kg-1s-2. Otherwise you'll have to fiddle with the units of GM to match your choice if length unit.
 

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