The factor that is not needed when calculating the velocity of a satellite orbiting a planet is the mass of the satellite.
The velocity of a satellite in orbit can be determined using the formula:
\[ v = \sqrt{\frac{GM}{r}} \]
where:
- \( v \) = orbital velocity
- \( G \) = universal gravitational constant
- \( M \) = mass of the planet
- \( r \) = orbital radius of the satellite (which is the distance from the center of the planet to the satellite)
As you can see, the mass of the satellite does not appear in this equation.
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