About Gravity Probe B
Group: 3 satellites
Description loading...
Live Position
Loading 3D Globe...
Upcoming Passes
Altitude History
Altitude vs Time
uPlot chart will show altitude changes over time
Two-Line Element Set
1 28230U 04014A 25325.35135044 .00001167 00000-0 14212-3 0 9994
2 28230 89.8464 54.2238 0002134 75.9316 284.2146 14.82865259621546
Epoch: Nov 21, 2025 •
Age: 12 hours
Current Status
Altitude 645.0 km
Velocity 7.53 km/s
Sub-Earth Point -60.01°S,
139.34°W
Launch Date Apr 20, 2004
Age 21.5 years
Type other
Technical Details
Classification Payload
Mass 3145.00 kg
Dry Mass 2805.00 kg
Total Mass 3145.00 kg
Length 6.40 m
Diameter 2.60 m
Span 6.40 m
Shape Ell + Ant + 4 Pan
Manufacturer LMMS/STAN
Phase Status In Orbit
Owner/State MSFC/US
Large Constellations
Loading constellations...