Manifest / 01Go
Starlink Group 10-39
Falcon 9 Block 5
ProviderSpaceX
PadSpace Launch Complex 40
DateAug 21, 2026
Time (UTC)03:14 PM UTC
Launch clockT– to liftoff
T-:::
Confirmed to the minute00
15
28
01
Back to launches
Success
HEAO 1
Atlas SLV-3D CentaurUnited States Air ForceLaunch Complex 36B
Friday, August 12, 1977 · 06:29 AM UTC
This mission is complete.
Mission Brief
Observatory satellite dedicated to X-ray and gamma-ray studies
PayloadHEAO 1
OrbitLow Earth Orbit
CustomerUnited States Air Force
Stages2
PadLaunch Complex 36B, Cape Canaveral SFS, FL, USA
Mission Timeline
14 / 14100%Ground vector
Launch site
Site locked
Launch Complex 36B
Cape Canaveral SFS, FL, USA
Global range
- Latitude
- 28.471°N
- Longitude
- 80.542°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
06:29 AM UTC - 06:29 AM UTC
Schedule History
No meaningful launch-time or status changes recorded.
