Nimiq-4 is a Canadian geosynchronous communications satellite. It was launched aboard a Proton-M / Briz-M launch vehicle at 21:48:00 UTC on 19 September 2008. It was positioned at 82.0° West longitude, and operated by Telesat Canada.

Spacecraft

The satellite was constructed by EADS Astrium, using a Eurostar-3000S bus. It is powered by two solar panels, with a span of 39 m, producing 12 kW of power. The launch mass of the satellite is 4850 kg, with fuel. It carries 40 transponders, 32 of which operate in the Ku-band, and 8 which operate in the Ka-band. It provides digital HDTV to Canada and United States.