Orbital Velocity Calculation for an Asteroid at Perihelion

[ZedCar]

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

 

[gneill]

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.