Falcon 9 | SDA Tranche 1 Tracking Layer C — Launch 30 Sept 2026

When is the launch?

A SpaceX Falcon 9 Block 5 is scheduled to launch the SDA Tranche 1 Tracking Layer C mission no earlier than 00:00 UTC on 30 September 2026. The flight will lift off from Space Launch Complex 4E (SLC-4E) at Vandenberg Space Force Base, California. The launch status is currently listed as TBD, so the exact time and date may shift as the mission approaches. You can always check the current time on our rocket launch schedule.

Launching from Vandenberg on the West Coast allows Falcon 9 to reach the polar and near-polar orbits typically used for the Space Development Agency's proliferated constellation.

How to watch live

SpaceX usually begins its official webcast on X and YouTube around 15 minutes before liftoff. For national security missions like SDA payloads, coverage may end shortly after stage separation, with limited detail on orbital insertion.

You can follow the countdown, launch window, and the ascent in context on Cosmik's real-time 3D solar system and satellite map. After deployment, track the newly added spacecraft as they join the growing SDA network overhead.

What is the payload?

This mission carries satellites for the Space Development Agency (SDA) Tranche 1 Tracking Layer, a constellation designed to detect and track advanced missile threats, including hypersonic and ballistic vehicles, from low Earth orbit. The Tracking Layer uses wide-field-of-view infrared sensors to spot the heat signatures of launches and follow them across their flight paths.

The Tracking Layer works alongside the SDA's Transport Layer, which relays data across the constellation and down to users. Together these form part of the agency's Proliferated Warfighter Space Architecture (PWSA) — a mesh of many small, mass-produced satellites in LEO built to be resilient and frequently upgraded. "Tranche 1" represents the first operational generation of this architecture, following the smaller Tranche 0 demonstration satellites.

Why low Earth orbit?

Placing tracking sensors in LEO rather than higher orbits gives the SDA closer, higher-resolution views of dim, fast-moving targets. A large number of satellites ensures continuous global coverage as each spacecraft passes quickly overhead.

What rocket is flying?

The Falcon 9 Block 5 is SpaceX's workhorse two-stage rocket and the most-flown orbital launch vehicle in the world. Its reusable first stage returns to land either on a droneship at sea or back at the launch site, enabling rapid turnaround and lowering costs.

Key facts about this mission:

• Operator: SpaceX, launching on behalf of the U.S. Space Development Agency
• Orbit: Low Earth orbit, consistent with the SDA's proliferated architecture
• Mission type: Missile detection and tracking
• Recovery: Falcon 9 first stages are typically recovered for reuse

Where can I learn more?

For background on the vehicle, operator, and launch site, see these references:

• Falcon 9 (Wikipedia)
• SpaceX (Wikipedia)
• Vandenberg Space Force Base (Wikipedia)
• The Space Devs Launch Library (data source)

Stay up to date with more missions on our latest launch news feed, and explore the thousands of active satellites — including military and communications constellations — on the live Cosmik map.

Follow this launch live on Cosmik

Watch the countdown to the SDA Tranche 1 Tracking Layer C mission and follow Falcon 9 in real time on Cosmik's 3D map. Enable free launch alerts so you never miss liftoff, and track the deployed satellites as they join the orbital network above you.