| Intelsat II F-4 | |
| Mission Type: | Communications |
| Operator: | Intelsat |
| Cospar Id: | 1967-094A[1] |
| Satcat: | 2969 |
| Mission Duration: | 3 years planned years achieved |
| Spacecraft Bus: | HS-303A |
| Spacecraft Type: | Intelsat II |
| Manufacturer: | Hughes |
| Power: | 85 watts |
| Launch Date: | UTC[2] |
| Launch Rocket: | Delta E1 |
| Launch Site: | Cape Canaveral LC-17B |
| Launch Contractor: | NASA |
| Deactivated: | c. |
| Orbit Epoch: | February 8, 2014, 07:56:55 UTC[3] |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Geosynchronous |
| Orbit Periapsis: | 35742km (22,209miles) |
| Orbit Apoapsis: | 35886km (22,299miles) |
| Orbit Inclination: | 6.00 degrees |
| Orbit Period: | 23.95 hours |
| Orbit Longitude: | 176° east (1967-70) 166° west (1971) |
| Apsis: | gee |
| Programme: | Intelsat II |
| Previous Mission: | Intelsat II F-3 |
| Next Mission: | Intelsat III F-1 (Intelsat III) |
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 162kg (357lb) at launch, decreasing through expenditure of propellant to 86kg (190lb) 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 35742km (22,209miles), an apogee of 35886km (22,299miles), inclination of 6.00 degrees and an orbital period of 23.95 hours.[3]