How do I tween the orbit rotation of a sprite?

I want a sprite to orbit another sprite by setting the orbit rotation (in orbit behaviour) every frame, but I want the orbiting sprite to smoothly ease to its new position. How do I do this?

I have tried create a value tween in the update loop and then assigning that value every frame to the Orbit.Rotation value but that seems to make a bit of a mess.

The answer is:

anglelerp(Self.Orbit.Rotation,new_angle,lerp_speed)

Although it would be nice to know how to do it with a tween so I can get more control over the easing.