How to define the Class for a ReferencePoint

[Gauß]

I would like to use "ReferencePoint" for a asteroid-binary. How can I define the Class of the Barycenter-Orbit.
I tried this:

ReferencePoint "Barycenter" "Sol" {

Class "asteroid"
Visible true
Clickable true

EllipticalOrbit {
...
}
}

"Asteriod 1" "Sol/Barycenter" {

Class "asteroid"
Texture "asteroid.jpg"
...

But I only get a moon-like (green) orbit and name for the Barycenter and an asteroid-like (brown) for the asteroid. I would like to have the class "asteroid" for both "objects".