Orbit
Calculates and applies forces necessary to make particles orbit around a centerpoint. You must choose the centerpoint in the parameter editor.
This tool can be used, for example, to simulate planets or other items in the solar system.
Using Orbit
Click the
Orbit button on the Drive Particles tab.Click
the 
particle system you want to be affected and press Enter to confirm your selection.Specify the node settings in the operation controls toolbar or parameter editor.
For specific parameter help see the Orbit node help.