Intelsat II F-4 was a communications satellite operated by Intelsat . Launched in 1967 it was operated in geostationary orbit at a longitude of 176 degrees east and later 166 degrees west. ^[4]

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. ^[5] 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 . ^[2] 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. ^[4]

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. ^[3]

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