Falcon 9 Block 5 | Starlink Group 17-21
A batch of 25 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.
Launch Vehicle
Falcon 9 Block 5
Falcon 9 is SpaceX's two-stage, partially reusable orbital rocket and the world's most frequently flown launch vehicle. The current Block 5 variant, flying since May 2018, is optimised for rapid reuse: its first-stage booster lands on drone ships or at the launch site and can fly again with minimal refurbishment. Individual boosters have surpassed 20 flights on a single airframe, fundamentally changing the economics of orbital launch.
70 m (229 ft)
3.7 m (12 ft)
22,800 kg (expendable) / 17,400 kg (reusable)
8,300 kg (reusable)
2
June 4, 2010 (Block 5: May 11, 2018)
Engines
9× Merlin 1D (first stage), 1× Merlin 1D Vacuum (second stage)
Propellant
RP-1 (kerosene) / Liquid Oxygen
Reusable
YesNotable
- First orbital-class rocket to land and refly its first-stage booster
- Single booster record: B1067 has flown 34+ times on one airframe — the most of any orbital rocket booster in history
- Workhorse of the Starlink broadband constellation — hundreds of Starlink flights
- Has flown NASA astronauts, classified payloads, commercial satellites, and interplanetary spacecraft
T-Minus
Launch Window
Window not open
Open
7:39 PM PDT
Target
7:39 PM PDT
Close
11:39 PM PDT
98%
Hourly forecast: clear · precip 4% · clouds 12% · wind 7 mph · gusts 12 mph · vis 14.9 km
As of 2026-04-10 · Open-Meteo forecast
No livestream link available yet
Space Launch Complex 4E, Vandenberg SFB, CA
Launch data via TheSpaceDevs Launch Library. Weather estimates via Open-Meteo using vehicle-specific commit criteria. Always verify with the launch provider.