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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

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