Starlink Group 13-4, USA 549 & USA 550

Launch Success

Liftoff Time (GMT)

18:35:09

Thursday July 31, 2025

Watch Replay

Official Livestream

Watch on spacex.com

Mission Details

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Track Payloads

Starlink Group 13-4

Wiki

SpaceX launch of a batch of Starlink v2-mini satellites for their second-generation high-speed low earth orbit internet satellite constellation.

Manufacturer: SpaceX

Operator: SpaceX

Sun-Synchronous Orbit

19 Payloads

USA 549 & USA 550

SpaceX launched two classified payloads on this mission identified as USA 549 and USA 550 by the US government. It is believed these two satellites are based off the company's Starshield satellite bus derived from the Starlink satellite bus.

Sun-Synchronous Orbit

2 Payloads

Rocket

Active
Falcon 9 Block 5

Active Since 2018

SpaceX logo

Agency

SpaceX

Price

$69.75 million

Rocket

Diameter: 3.7m

Height: 70m

Payload to Orbit

LEO: 22,800 kg

GTO: 8,300 kg

Liftoff Thrust

7,607 Kilonewtons

Fairing

Diameter: 5.2m

Height: 13m

Stages

2

Launch Site

General Trajectory

SE

SW

Launching

South

SLC-4E

Vandenberg SFB, California, USA

Fastest Turnaround

2 days 21 hours

Stats

Falcon 9


512th

Mission

94th

Mission of 2025

SpaceX


537th

Mission

97th

Mission of 2025

2025


169th

Orbital launch attempt