Payload
USA 521
OperationalPayloadLEO
USA 521 is a United States payload satellite, launched on April 16, 2025 into LEO.
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Launch
- Launch date
- April 16, 2025 at 07:33 PM UTC
- Launch site
- Vandenberg SFB, USA
- Launched by
- Minotaur IV →
- Operator
- Northrop Grumman Space Systems
- Mission
- NROL-174
- Launch record
- View full launch →
Orbit
- Orbit regime
- LEO
- Apoapsis
- 1,137 km
- Periapsis
- 1,092 km
- Inclination
- 63.4°
- Orbital period
- 107.58 min
Spacecraft
- Operator
- United States
Identity
- COSPAR (Int'l)
- 2025-077A
- NORAD catalog №
- 63596
- Object type
- Payload
- Owner / operator
United States- Status
- Operational