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 26055.49040869 .00005512 00000-0 11956-3 0 9993
2 20547 94.0901 80.0445 0055678 204.8079 155.0497 15.42823662984501
Epoch: Feb 24, 2026 • Age: 16 hours

Current Status

Altitude 464.8 km
Velocity 7.63 km/s
Sub-Earth Point 85.67°N, 119.38°E
Launch Date Apr 5, 1990
Age 35.8 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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