About USA 77
Group: 3 satellites
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Live Position
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Altitude History
Altitude vs Time
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Two-Line Element Set
1 21809U 91076E 25326.46275966 .00003235 00000-0 27575-3 0 9998
2 21809 63.2994 349.0582 0900410 70.7389 298.8758 13.54747051 76247
Epoch: Nov 22, 2025 •
Age: 19 hours
Current Status
Altitude 1481.5 km
Velocity 6.92 km/s
Sub-Earth Point -51.41°S,
151.31°E
Launch Date Nov 8, 1991
Age 34 years
Type military
Technical Details
Classification Payload
Mass 400.00 kg
Dry Mass 400.00 kg
Total Mass 400.00 kg
Length 1.00 m
Diameter 1.00 m
Span 10.00 m
Shape Box + Ant
Manufacturer NRL
Bus Type NOSS B SSU
Phase Status In Orbit
Owner/State NRO/NRL/US
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