Formerly known as WPLTN-1, this geodesy satellite was a copy of Potsdam's GFZ-1 satellite, a sphere covered with laser retroreflectors, with a different `Fizeau' corner cube design. It serves as a target for the Western Pacific Laser Tracking Network (WPLTN) and is a joint project of Electro Optic Systems of Queanbeyan, New South Wales, Australia, and the Russian Space Agency. Diameter is 0.24m.