|Mission duration||5 years (planned)|
|Launch mass||293 kilograms (646 lb)|
|BOL mass||151 kilograms (333 lb)|
|Start of mission|
|Launch date||July 23, 1970, 00:16:03UTC|
|Launch site||Cape Canaveral LC-17A|
|Perigee altitude||19,400 kilometers (12,100 mi)|
|Apogee altitude||36,030 kilometers (22,390 mi)|
|Epoch||July 23, 1970|
The last of eight Intelsat III satellites to be launched, Intelsat III F-8 was built by TRW. It was a 293-kilogram (646 lb) spacecraft equipped with two transponders to be powered by body-mounted solar cells generating 183 watts of power. It had a design life of five years and carried an SVM-2 apogee motor for propulsion.
Intelsat III F-8 was launched on a Delta M rocket, flying from Launch Complex 17A at the Cape Canaveral Air Force Station. The launch took place on July 23, 1970, with the spacecraft bound for a geosynchronous transfer orbit.
The Intelsat III F-8 was lost due to a malfunction during the apogee motor firing. Communications stopped 14.5 seconds into the planned 27 second apogee motor burn.