USA 55

operational
NORAD ID: 20547 Int'l Des: 1990-028 Owner: DARPA/USN Country: US
LEOCIRCULARRETROGRADE

About USA 55

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Live Position

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Upcoming Passes

Altitude History

Altitude vs Time

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Two-Line Element Set

1 20547U 90028B 25322.18440558 .00007494 00000-0 16960-3 0 9995
2 20547 94.1019 24.7639 0056883 222.9449 136.7357 15.41462620969352
Epoch: Nov 18, 2025 • Age: 18 hours

Current Status

Altitude 456.9 km
Velocity 7.64 km/s
Sub-Earth Point -63.33°S, 7.57°W
Launch Date Apr 5, 1990
Age 35.6 years
Type military

Technical Details

Classification Payload
Mass 68.00 kg
Dry Mass 68.00 kg
Total Mass 68.00 kg
Length 0.40 m
Diameter 0.40 m
Span 0.40 m
Shape Poly
Manufacturer DSI
Bus Type GLOMR
Phase Status In Orbit
Owner/State DARPA/USN/US

Large Constellations

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