About TDRS 4
Group: 3 satellites
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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 19883U 89021B 25279.57351428 -.00000140 00000-0 00000-0 0 9995
2 19883 12.8324 356.4380 0016580 296.4236 45.9100 0.98482465305544
Epoch: Oct 6, 2025 •
Age: 10 hours
Current Status
Altitude 36363.7 km
Velocity 3.05 km/s
Sub-Earth Point 10.10°N,
114.83°E
Launch Date Mar 13, 1989
Age 36.5 years
Type other
Technical Details
Classification Payload
Mass 2245.00 kg
Dry Mass 1673.00 kg
Total Mass 2245.00 kg
Length 1.30 m
Diameter 2.40 m
Span 17.40 m
Shape Box + Dish + 2 Pan
Manufacturer TRW
Bus Type TDRS
Phase Status In Orbit
Owner/State GSFC/US
Large Constellations
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