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Navstar 1
retired
Positioning Navigation Timing
MEO
COSPAR 1978-020A
Launched 2/22/1978
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Mission & Launch
Launch Mission
GPS 1
Launch Vehicle
Atlas F
Launch Date
2/22/1978
Last Contact
7/17/1985
Orbit & Mass
Orbit Class
MEO
Altitude
20,183 km
Inclination
63.31 deg
Orbit Plane
2
Dry Mass
409 kg
Total Mass
775 kg
Payload Classification
Mission Type
Positioning Navigation Timing
Payload Category
NAV
Payload Class
D
Organizations
Operator
U.S. Air Force
Manufacturer
Boeing
Constellation
Name
GPS
Active Satellites
35
Planned Satellites
24
Registry
COSPAR ID
1978-020A
UN Registration
ST/SG/SER.E/007
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Mentions
1
All verified mentions of this spacecraft in source documents.
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Navstar 1, the first GPS satellite, was launched in 1978.
Plan
Value 3.0
Aug 9, 2021
U.S. military doubles down on GPS despite vulnerabilities