Ratsat

Ratsat, or DemoSat, was a 165-kilogram non-functional boilerplate spacecraft used as a mass simulator on the fourth flight of the Falcon 1 rocket. The Falcon 1 launch that carried Ratsat to orbit was the first successful orbital launch of any privately funded and developed, liquid-propellant carrier rocket, the SpaceX Falcon 1, something only six nations had successfully accomplished previously. Ratsat remained bolted to the second stage of the carrier rocket after reaching low Earth orbit. It has a hexagonal prism shape, 1.5 m long.