|Mission duration||3 years planned|
3 1⁄2 years achieved
|Spacecraft type||Intelsat II|
|Launch mass||162 kilograms (357 lb)|
|BOL mass||86 kilograms (190 lb)|
|Start of mission|
|Launch date||September 28, 1967, 00:45:00UTC|
|Launch site||Cape Canaveral LC-17B|
|End of mission|
|Longitude||176° east (1967-70)|
166° west (1971)
|Perigee altitude||35,742 kilometers (22,209 mi)|
|Apogee altitude||35,886 kilometers (22,299 mi)|
|Epoch||February 8, 2014, 07:56:55 UTC|
The fourth and last Intelsat II satellite to be launched, Intelsat II F-4 was built by Hughes Aircraft around the HS-303A satellite bus. It carried two transponders, which were powered by body-mounted solar cells generating 85 watts of power. The spacecraft had a mass of 162 kilograms (357 lb) at launch, decreasing through expenditure of propellant to 86 kilograms (190 lb) by the beginning of its operational life.
Intelsat II F-4 was launched atop a Delta E1 rocket flying from Launch Complex 17B at the Cape Canaveral Air Force Station. The launch took place at 00:45:00 UTC on September 28, 1967, with the spacecraft entering a geosynchronous transfer orbit. It fired an SVM-1 apogee motor to place itself into its operational geostationary orbit. The spacecraft was operated at a longitude of 176° east until 1970, before being moved to 166° west. In total the satellite remained in service for around three and a half years.
As of February 8, 2014 the derelict Intelsat II F-4 was in an orbit with a perigee of 35,742 kilometers (22,209 mi), an apogee of 35,886 kilometers (22,299 mi), inclination of 6.00 degrees and an orbital period of 23.95 hours.