The mass of the satellite doesn´t have anything to do with the time in which the satellite is orbiting the planet, because the gravity of the planet remains the same, in this case as you know the velocity doesn´t depend on mass, so the velocity of orbit will remain the same and the satellite eventhoug twice as heavy or with double the mass will be orbiting at the same rate.
It's known as Absolute Zero. On the Kelvin scale, 0 is the lowest that anything can reach in temperature. It's supposedly impossible to reach, but it's the known limit.
