How is velocity calculated at perihelion?
4-significant digits (sd) approximation: 30.79 km/s
Easy formula for velocity at perihelion and aphelion:
If V is the speed at the distance equal to semi-major axis a ( at an end of the minor axis) of the orbit, Vp and Va are speeds at perihelion and aphelion and e is the orbit eccentricity.
V - 29.774 km/s, nearly. e = 0.01671, nearly.