Navstar 7

Navstar 7
NamesGPS I-7
GPS SVN-7
Mission typeNavigation
Technology
OperatorU.S. Air Force
Mission duration5 years (planned)
Launch failure
Spacecraft properties
SpacecraftNavstar
Spacecraft typeGPS Block I
ManufacturerRockwell Space Systems[1]
Launch mass758 kg (1,671 lb) [1]
Dimensions5.3 meters of long
Power400 watts
Start of mission
Launch date19 December 1981, 01:10:00 UTC
RocketAtlas E / SGS-1
(Atlas-76E) [2]
Launch siteVandenberg, SLC-3E
ContractorConvair
General Dynamics
Entered serviceLaunch failure
Orbital parameters
Reference systemGeocentric orbit (planned)
RegimeMedium Earth orbit
(Semi-synchronous)
Altitude20,200 km
Inclination63.0°
Period720 minutes
← OPS 5118 (Navstar 6)
OPS 9794 (Navstar 8) →

Navstar 7, also known as GPS I-7 and GPS SVN-7, was an American navigation satellite which was lost in a launch failure in 1981. It was intended to be used in the Global Positioning System development program. It was the seventh of eleven Block I GPS satellites to be launched, and the only one to fail to achieve orbit.[1]

  1. ^ a b c Cite error: The named reference GSP was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference LL was invoked but never defined (see the help page).