Manifest / 01Go
Unknown Payload
Long March 6C
ProviderChina Aerospace Science and Technology Corporation
PadLaunch Complex 9A
DateAug 25, 2026
PrecisionAbout 03:20 AM UTC
Schedule watchTracking updates
T– about 9hWindow opens 03:15 AM UTC
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Success
Gravity Probe B
Delta II 7920-10CUnited States Air ForceSpace Launch Complex 2W
Tuesday, April 20, 2004 · 04:57 PM UTC
This mission is complete.
Mission Brief
Gravity Probe B (GP-B) was a satellite-based experiment to test two unverified predictions of general relativity: the geodetic effect and frame-dragging. This was to be accomplished by measuring, very precisely, tiny changes in the direction of spin of four gyroscopes contained in an Earth-orbiting satellite at 650 km (400 mi) altitude, crossing directly over the poles.
PayloadGravity Probe B
OrbitLow Earth Orbit
CustomerUnited States Air Force
StagesUnknown
PadSpace Launch Complex 2W, Vandenberg SFB, CA, USA
Mission Timeline
14 / 14100%Ground vector
Launch site
Site locked
Space Launch Complex 2W
Vandenberg SFB, CA, USA
Global range
- Latitude
- 34.756°N
- Longitude
- 120.622°W
Range Weather
Launch commit criteria
Clear
Watch
TrackingNo active constraints
Weather Rules
Tracking no weather issues at this time.
- Primary concern
- No weather issues
- Rule count
- 0
- Temperature
- Not reported
- Surface wind
- Not reported
Window
04:57 PM UTC - 04:57 PM UTC
Schedule History
No meaningful launch-time or status changes recorded.
