|Start of mission|
|Launch date||18 September 2008, 21:47|
|Launch site||Baikonur 200/39|
Nimiq-4 is a Canadian geosynchronous communications satellite. It was launched aboard a Proton-M/Briz-M carrier rocket at 21:47 GMT on 19 September 2008. It was positioned at 82ºW longitude, and operated by Telesat Canada.
The satellite was constructed by EADS Astrium, using a Eurostar-3000S bus. It is powered by two solar arrays, with a span of 39 metres (128 ft), producing 12 kW of power. The launch mass of the satellite is 4.8 tonnes (4.7 long tons). It carries 40 transponders, 32 of which operate in the NATO J band (IEEE Ku band), and 8 which operate in the NATO K band (IEEE Ka band).