GPS · Navigation
NAVSTAR 18 (USA 50)
NonoperationalNavigationMEO
NAVSTAR 18 (USA 50) is a U.S. Space Force navigation satellite, part of the GPS constellation, launched on January 24, 1990 into MEO.
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Launch
- Launch date
- January 24, 1990 at 10:55 PM UTC
- Launch site
- Cape Canaveral SFS, USA
- Launched by
- Delta II 6925 →
- Operator
- United States Air Force
- Mission
- GPS-2 6
- Launch record
- View full launch →
Orbit
- Orbit regime
- MEO
- Apoapsis
- 21,241 km
- Periapsis
- 21,153 km
- Inclination
- 54.86°
- Orbital period
- 759.5 min
Spacecraft
- Operator
- U.S. Space Force
- Manufacturer
- Lockheed Martin
- Users
- Government/Military
- Launch mass
- 836.47 kg
- Design lifetime
- 15 years
- Detailed purpose
- Navigation
Identity
- COSPAR (Int'l)
- 1990-008A
- NORAD catalog №
- 20452
- Object type
- Payload
- Owner / operator
United States- Constellation
- GPS
- Radar cross-section
- 1.5223 m²
- Status
- Nonoperational
End of mission
- Fate
- No longer operational — remains in orbit as inactive.
- Final status
- Nonoperational
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