A booster on its 36th flight launches 27 Starlink satellites. Reading the first hour of Falcon 9's "Starlink 15-15" from the official timeline

According to SpaceX's official mission page, Falcon 9 launched 27 Starlink satellites to low-Earth orbit from Space Launch Complex 4 East (SLC-4E) at Vandenberg Space Force Base at 3:48 p.m. PT on Friday, October 23, 2026. It was the 36th flight for the first-stage booster, which landed on the droneship "Of Course I Still Love You" in the Pacific Ocean. The satellites deployed about 1 hour and 2 minutes after liftoff, and SpaceX confirmed deployment of all 27 on X.

3-line summary

• On October 23, 2026 (Pacific Time), SpaceX launched 27 Starlink satellites to low-Earth orbit on a Falcon 9 from Vandenberg Space Force Base in California (mission page: "Starlink 15-15").
• It was the 36th flight of the first-stage booster, which has also flown NASA's sea-level satellite and the DART asteroid mission. It landed again on a droneship in the Pacific.
• In the official timeline, the first stage lands about 8 minutes after liftoff, and the second stage coasts for about 45 minutes, fires its engine for about one second, and deploys the satellites about 1 hour 2 minutes after liftoff.

Background: first stage, second stage, and what "reaching orbit" means

A rocket is a vehicle that throws away weight as it goes. Falcon 9 has two stages stacked on top of each other. The first stage has nine Merlin engines burning liquid oxygen and rocket-grade kerosene (RP-1) (SpaceX). It burns for a little over two minutes and does the heavy lifting through the thick lower atmosphere. Once its tanks are empty, they are just dead weight, so the first stage separates and the lighter second stage keeps accelerating. The more weight you drop, the faster the same propellant can push you, which is why rockets use stages.

Being in orbit means falling all the time but never hitting the ground. Throw a ball sideways and it lands a little way off. Throw it faster and it lands farther away. Because Earth is round, if you throw it fast enough, the ground curves away as fast as the ball falls, and it never comes down. In low-Earth orbit, a few hundred kilometers up, that speed is about 7.8 km per second (about 28,000 km/h), fast enough to cross 400 km in under a minute. Most of a rocket's propellant goes into building this sideways speed, not into climbing.

Reuse means not throwing away the most expensive part. Rockets used to drop their first stage into the sea, even though it carries nine engines and the biggest tanks. Falcon 9 relights some engines after separation to slow down, deploys landing legs and touches down on a ship or a landing zone, then is inspected and flown again. If airlines threw away each plane after one flight, tickets would be very expensive; SpaceX explains reuse as the key to lowering the cost of access to space.

Max Q is the moment of strongest air pressure on the rocket. Stick your hand out of a moving car and the push gets stronger the faster you go. This push (dynamic pressure) is proportional to air density times the square of speed. Just after liftoff the rocket is slow, and higher up the air is thin, so somewhere in between the force peaks. That is Max Q ("Q" is the symbol for dynamic pressure), at 1 minute 8 seconds in this timeline.

What happened

From SpaceX's official mission page:

The booster previously launched Sentinel-6 Michael Freilich (a sea-level satellite), NASA's DART asteroid-impact mission, Transporter-7, Iridium OneWeb, SDA-0B, NROL-113, NROL-167, NROL-149, NAOS and now 27 Starlink missions (SpaceX). SpaceX also noted that residents of Santa Barbara, San Luis Obispo and Ventura counties may have heard one or more sonic booms, depending on weather and other conditions.

The first hour, from the official timeline

The timeline below is from SpaceX's page (all times approximate), with what each step means.

Why does the second stage coast for 45 minutes? In general, the shape of an orbit depends on where you fire the engine. The first burn often leaves the stage in a slightly stretched (elliptical) orbit, with a low point and a high point. Coasting about half an orbit to the high point and adding a little speed there raises the low point and rounds the orbit out. My own view is that a burn of only about one second is this kind of fine shaping rather than a big push; SpaceX's page does not state its purpose.

Why drop the fairing at 2:58? The fairing protects the satellites from air pressure and heating. Once the air is almost gone, it is just weight, and the sooner it goes, the more efficiently the second stage accelerates. Drop it too early, though, and the satellites are exposed to heat and wind, so it waits until the air is thin enough.

Why it matters

A single first stage flying 36 times shows, in one number, that rockets are no longer disposable. First-stage landing and reuse only began in 2015–2017 (the history of Falcon 9 landings). Today one booster has carried NASA science satellites, national security payloads, rideshare missions and communications satellites over several years. From a customer's view, it also means trust has built up that a "used rocket" can carry valuable satellites.

Geography explains why this launch was from Vandenberg. SpaceX says the base on the California coast gives access to high-inclination and polar orbits: launches heading straight south cross open ocean all the way to Antarctica. That keeps falling stages away from land and lets satellites cover high latitudes, which a global network like Starlink needs.

Useful points for reading launch news

• "Nth flight" is the booster's experience: In launch news, the flight number tells you how many times the same first stage has flown. Here, 36.
• Watch local time versus your time: This launch was the afternoon of October 23 in California and the morning of October 24 in Japan. A one-day shift is common.
• Common misconception: The whole rocket does not land. The first stage (and the fairing halves, when recovered) comes back; the second stage stays in orbit after releasing the satellites and is not recovered.

Timeline

• December 2015: A Falcon 9 first stage landed on land for the first time (more).
• March 2017: The first reflight of a previously flown first stage.
• 2020–2021: This booster launched NASA's Sentinel-6 Michael Freilich and DART from Vandenberg.
• October 22, 2026: The first attempt was called off due to poor weather (SpaceX on X).
• October 23, 2026: On its 36th flight, the same booster carried 27 Starlink satellites and landed on a droneship in the Pacific (SpaceX).
• Next: SpaceX's launch list shows more Starlink missions from Vandenberg on October 27, October 30 and November 5 (as of October 24, 2026).

A question to keep going

How many times can one first stage fly? Learning what wears out on each flight, and what gets replaced, shows the real difficulty of reuse.

Read next

• What Is Falcon 9? Size, Engines, Payload and Reuse, Checked on SpaceX's Official Page
• The Day a Rocket Came Down Standing Up: Falcon 9's Landing Failures, Success and First Reflight (2015–2017)
• How much does a rocket cost? (how reuse changes the cost of launch)

Sources

• SpaceX, "Starlink Mission" (Starlink 15-15, October 23, 2026) → https://www.spacex.com/launches/sl-15-15
• SpaceX on X (deployment confirmed) → https://x.com/SpaceX/status/2113780307904381100
• SpaceX, "Launches" (upcoming launches and the Vandenberg site) → https://www.spacex.com/launches/
• SpaceX, "Falcon 9" → https://www.spacex.com/vehicles/falcon-9/

Note: The launch time, site, number of satellites, booster flight count, landing and timeline were checked on SpaceX's official pages; deployment and the October 22 scrub on SpaceX's X account (as of October 24, 2026).