The Galaxy satellite series is a constellation of geostationary communications satellites owned and operated by PanAmSat. The latest member of the constellation is Galaxy 15, launched on 13 October 2005, by an Ariane 5 rocket. Galaxy 15 is the third of five satellites built by Orbital Sciences Corporation and a next-generation high-performance cable satellite. Galaxy 15's 24 C-band transponders offer coverage of all 50 states in the US including Alaska and Hawaii.