Falcon 9 Block 5 | Starlink Group 12-23 launch

SpaceXLaunch SuccessfulCommunications

Starlink Group 12‑23

Name: Falcon 9 Block 5 | Starlink Group 12-23
Start: 2025-04-28T02:09:40Z
Location: Space Launch Complex 40, Cape Canaveral SFS, FL, USA

Falcon 9 Block 5

Launched Mon, Apr 28 · 2:09:40 AM UTC2025-04-28 02:09:40 UTCSpace Launch Complex 40, Cape Canaveral SFS, FL, USA

Reached orbit
Booster landed on Just Read the Instructions

Follow SpaceX in the app Watch the replay

Success

Reached Low Earth Orbit

The second stage shut down at T+8:39.

Landed

B1077 Landed

The first stage landed on Just Read the Instructions, on its 20th flight.

Worldwide

87th

orbital launch attempt in 2025

SpaceX

50th

launch this year

Space Launch Complex 40

23rd

launch from this pad this year

Pad turnaround

3 d

since the pad's previous launch

Replay

Replay: SpaceX Starlink Group 12-23

The Flight Plan

Planned times, from liftoff at 2:09 AM UTC. The result is at the top of the page.

Countdown9

T−38:001:31 AMLaunch director verifies go for propellant load
T−35:001:34 AMStart of propelland loading
T−35:001:34 AMStart of liquid oxygen loading in the first stage
T−16:001:53 AMStart of liquid oxygen loading in the second stage
T−7:002:02 AMStart of engine chilling
T−1:002:08 AMFuel tanks are pressurized to flight levels
T−1:002:08 AMThe onboard computer takes control over the countdown and runs last checks
T−0:452:08 AMLaunch director verifies go for launch
T−0:032:09 AMStart of the engine ignition sequence

Show the countdown (9 steps)

T−38:001:31 AMLaunch director verifies go for propellant load
T−35:001:34 AMStart of propelland loading
T−35:001:34 AMStart of liquid oxygen loading in the first stage
T−16:001:53 AMStart of liquid oxygen loading in the second stage
T−7:002:02 AMStart of engine chilling
T−1:002:08 AMFuel tanks are pressurized to flight levels
T−1:002:08 AMThe onboard computer takes control over the countdown and runs last checks
T−0:452:08 AMLaunch director verifies go for launch
T−0:032:09 AMStart of the engine ignition sequence

Ascent6

T+0:002:09 AMFirst upwards movement of the rocket
T+1:112:10 AMMaximum dynamic pressure
T+2:252:12 AMCut-off of the main engine
T+2:292:12 AMSeparation of the second stage from the first
T+2:362:12 AMFirst start of the second engine
T+3:052:12 AMSeparation of the payload fairing

Booster Return4

T+6:022:15 AMStart of the atmospheric entry burn
T+6:272:16 AMEnd of the atmospheric entry burn
T+7:422:17 AMStart of the first stage landing burn
T+8:122:17 AMLanding of the first stage

Second Stage and Payload4

T+8:392:18 AMFirst cut-off of the second engine
T+54:023:03 AMSecond start of the second engine
T+54:043:03 AMSecond cut-off of the second engine
T+1:05:113:14 AMDeployment of the Starlink stack from the rocket

Mission

A batch of 23 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.

Launch Provider

SpaceX

Commercial · United States of America · Founded 2002 · CEO Elon Musk

Space Exploration Technologies Corp., known as SpaceX, is an American aerospace manufacturer and space transport services company headquartered in Hawthorne, California. It was founded in 2002 by entrepreneur Elon Musk with the goal of reducing space transportation costs and enabling the colonization of Mars. SpaceX operates from many pads, on the East Coast of the US they operate from SLC-40 at Cape Canaveral Space Force Station and historic LC-39A at Kennedy Space Center. They also operate from SLC-4E at Vandenberg Space Force Base, California, usually for polar launches. Another launch site is being developed at Boca Chica, Texas.

Launches

742

Successful

727

98%

Landings

687

of 715

Upcoming

136

scheduled

FliesFalcon Starship Dragon

All SpaceX launches Website Wikipedia

Updates

Apr 28 · 4:14 AM
Launch success.
Cosmic_Penguin
Apr 28 · 2:12 AM
Unofficial Re-stream by SPACE AFFAIRS has started
Launch Library 2
Apr 28 · 2:10 AM
Liftoff
SwGustav
Apr 27 · 9:38 PM
New T-0.
Cosmic_Penguin
Apr 27 · 2:37 PM
Weather 90% GO.
hitura-nobad

Show earlier updates

Apr 26 · 1:44 AM
GO for launch.
Cosmic_Penguin
Apr 21 · 5:32 PM
Changed launch pad.
Cosmic_Penguin
Apr 21 · 2:26 PM
Added launch.
Cosmic_Penguin

Falcon 9 Block 5

Vehicle history

Height

70m

Diameter

3.6m

To low Earth orbit

22,800kg

Liftoff thrust

7,607kN

Space Launch Now for iOS and Android

Notifications before every launch you follow, live countdowns on your home screen and watch, and webcasts as they start.

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Scan to open on your phone

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SpaceXLaunch SuccessfulCommunications

Starlink Group 12‑23

Falcon 9 Block 5

Launched Mon, Apr 28 · 2:09:40 AM UTC2025-04-28 02:09:40 UTCSpace Launch Complex 40, Cape Canaveral SFS, FL, USA

Reached orbit
Booster landed on Just Read the Instructions

Follow SpaceX in the app Watch the replay

Success

Reached Low Earth Orbit

The second stage shut down at T+8:39.

Landed

B1077 Landed

The first stage landed on Just Read the Instructions, on its 20th flight.

Worldwide

87th

orbital launch attempt in 2025

SpaceX

50th

launch this year

Space Launch Complex 40

23rd

launch from this pad this year

Pad turnaround

3 d

since the pad's previous launch

Replay

Replay: SpaceX Starlink Group 12-23

The Flight Plan

Planned times, from liftoff at 2:09 AM UTC. The result is at the top of the page.

Countdown9

T−38:001:31 AMLaunch director verifies go for propellant load
T−35:001:34 AMStart of propelland loading
T−35:001:34 AMStart of liquid oxygen loading in the first stage
T−16:001:53 AMStart of liquid oxygen loading in the second stage
T−7:002:02 AMStart of engine chilling
T−1:002:08 AMFuel tanks are pressurized to flight levels
T−1:002:08 AMThe onboard computer takes control over the countdown and runs last checks
T−0:452:08 AMLaunch director verifies go for launch
T−0:032:09 AMStart of the engine ignition sequence

Show the countdown (9 steps)

T−38:001:31 AMLaunch director verifies go for propellant load
T−35:001:34 AMStart of propelland loading
T−35:001:34 AMStart of liquid oxygen loading in the first stage
T−16:001:53 AMStart of liquid oxygen loading in the second stage
T−7:002:02 AMStart of engine chilling
T−1:002:08 AMFuel tanks are pressurized to flight levels
T−1:002:08 AMThe onboard computer takes control over the countdown and runs last checks
T−0:452:08 AMLaunch director verifies go for launch
T−0:032:09 AMStart of the engine ignition sequence

Ascent6

T+0:002:09 AMFirst upwards movement of the rocket
T+1:112:10 AMMaximum dynamic pressure
T+2:252:12 AMCut-off of the main engine
T+2:292:12 AMSeparation of the second stage from the first
T+2:362:12 AMFirst start of the second engine
T+3:052:12 AMSeparation of the payload fairing

Booster Return4

T+6:022:15 AMStart of the atmospheric entry burn
T+6:272:16 AMEnd of the atmospheric entry burn
T+7:422:17 AMStart of the first stage landing burn
T+8:122:17 AMLanding of the first stage

Second Stage and Payload4

T+8:392:18 AMFirst cut-off of the second engine
T+54:023:03 AMSecond start of the second engine
T+54:043:03 AMSecond cut-off of the second engine
T+1:05:113:14 AMDeployment of the Starlink stack from the rocket

Mission

A batch of 23 satellites for the Starlink mega-constellation - SpaceX's project for space-based Internet communication system.

Launch Provider

SpaceX

Commercial · United States of America · Founded 2002 · CEO Elon Musk

Launches

742

Successful

727

98%

Landings

687

of 715

Upcoming

136

scheduled

FliesFalcon Starship Dragon

All SpaceX launches Website Wikipedia

Updates

Apr 28 · 4:14 AM
Launch success.
Cosmic_Penguin
Apr 28 · 2:12 AM
Unofficial Re-stream by SPACE AFFAIRS has started
Launch Library 2
Apr 28 · 2:10 AM
Liftoff
SwGustav
Apr 27 · 9:38 PM
New T-0.
Cosmic_Penguin
Apr 27 · 2:37 PM
Weather 90% GO.
hitura-nobad

Show earlier updates

Apr 26 · 1:44 AM
GO for launch.
Cosmic_Penguin
Apr 21 · 5:32 PM
Changed launch pad.
Cosmic_Penguin
Apr 21 · 2:26 PM
Added launch.
Cosmic_Penguin

Falcon 9 Block 5

Vehicle history

Height

70m

Diameter

3.6m

To low Earth orbit

22,800kg

Liftoff thrust

7,607kN

Next From Cape Canaveral SFS

Cape Canaveral SFS schedule

Nov—NET

Cygnus CRS-2 NG-25SpaceX · Falcon 9 Block 5 · Space Launch Complex 40, Cape Canaveral SFS, FL, USALow Earth OrbitTo be determinedNET November Nov—NET

Amazon Leo (LV-01)United Launch Alliance · Vulcan VC6L · Space Launch Complex 41, Cape Canaveral SFS, FL, USALow Earth OrbitTo be determinedNET November

Space Launch Now for iOS and Android

Notifications before every launch you follow, live countdowns on your home screen and watch, and webcasts as they start.

See what's in the app

Scan to open on your phone

Starlink Group 12‑23

Replay

More Videos

The Flight Plan

Countdown9

Ascent6

Booster Return4

Second Stage and Payload4

Mission

SpaceX

Updates

Falcon 9 Block 5

Starlink Group 12‑23

Replay

More Videos

The Flight Plan

Countdown9

Ascent6

Booster Return4

Second Stage and Payload4

Mission

SpaceX

Updates

Falcon 9 Block 5

Next From Cape Canaveral SFS

Next From Cape Canaveral SFS

Starlink Group 12‑23

Replay

More Videos

The Flight Plan

Countdown9

Ascent6

Booster Return4

Second Stage and Payload4

Mission

SpaceX

Updates

Falcon 9 Block 5

Never Miss a Launch.

Starlink Group 12‑23

Replay

More Videos

The Flight Plan

Countdown9

Ascent6

Booster Return4

Second Stage and Payload4

Mission

SpaceX

Updates

Falcon 9 Block 5

Next From Cape Canaveral SFS

Never Miss a Launch.

Next From Cape Canaveral SFS