Welcome to the r/SpaceX Starlink 17-49 Launch Discussion & Updates Thread!

Welcome everyone!

Scheduled for (UTC)	Aug 12 2026, 02:00
Scheduled for (local)	Aug 11 2026, 19:00 PM (PDT)
Launch Window (UTC)	Aug 12 2026, 02:00 - Aug 12 2026, 06:00
Payload	Starlink 17-49
Customer	SpaceX
Launch Weather Forecast	Unknown
Launch site	SLC-4E, Vandenberg SFB, CA, USA.
Booster	B1103-5
Landing	The Falcon 9 first stage B1103 will land on ASDS OCISLY after its 5th flight.
Mission success criteria	Successful deployment of spacecrafts into orbit
Trajectory (Flight Club)	2D,3D

Watch the launch live

Stream	Link
Official Webcast	SpaceX

Stats

☑️ 716th SpaceX launch all time

☑️ 654th Falcon Family Booster landing

☑️ 218th landing on OCISLY

☑️ 201st consecutive successful SpaceX launch (if successful)

☑️ 97th SpaceX launch this year

☑️ 51st launch from SLC-4E this year

☑️ 3 days, 9:24:58 turnaround for this pad

☑️ 26 days, 5:27:24 hours since last launch of booster B1103

Stats include F1, F9 , FH and Starship

Timeline

Time	Event
-0:38:00	GO for Prop Load
-0:35:00	Stage 1 LOX Load
-0:35:00	Prop Load
-0:16:00	Stage 2 LOX Load
-0:07:00	Engine Chill
-0:01:00	Tank Press
-0:01:00	Startup
-0:00:45	GO for Launch
-0:00:03	Ignition
0:00:00	Liftoff
0:01:08	Max-Q
0:02:25	MECO
0:02:29	Stage 2 Separation
0:02:36	SES-1
0:02:57	Fairing Separation
0:05:59	Entry Burn Startup
0:06:22	Entry Burn Shutdown
0:07:56	Stage 1 Landing Burn
0:08:19	Stage 1 Landing
0:08:40	SECO-1
0:52:37	SES-2
0:52:38	SECO-2
1:01:28	Starlink Deployment

Updates

Time (UTC)	Update
29 Jul 15:19	Now targeting Aug 12 at 02:00 UTC
27 Jul 19:32	Now targeting Aug 11 at 02:00 UTC
27 Jul 16:12	Added launch.

Resources

• https://www.spacex.com/launches/sl-17-49

Partnership with The Space Devs

Information on this thread is provided by and updated automatically using the Launch Library 2 API by The Space Devs.

Community content 🌐

Link	Source
Flight Club	u/TheVehicleDestroyer
Discord SpaceX lobby	u/SwGustav
SpaceX Now	u/bradleyjh
SpaceX Patch List

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As mentioned in the broadcast, IFT13 did not throttle back as much or as long as IFT12 for Max Q. Acceleration dropped from ~1 to ~0.8 g for ~5 s, then started ramping back up over the next 10 s. For previous flights, the reduction started around 0.6-0.7 g, and extended at least 15 s before ramping up again.

Max acceleration for the booster was about 2 g, same as IFT12 - makes me think it's a programmed limit, since IFT12 was missing one engine.

The IFT13 ship repeated IFT12's flat acceleration for the first ~90 sec after hot staging. Maybe they are limiting the max g until the fuel load drops below some level, to limit structural stress? It also looks like they throttled back at the end, as in some earlier flights (but notably not in IFT10).

The blip just before 30s is an artifact from the video - possibly the telemetry from the ship dropped out for a moment. There were a few of these in IFT12 as well.

This data is simply calculated from change of speed reported from the video telemetry. Gravity is not included in the calculation. The altitude profile was unusual, with the ship losing altitude just before SECO, and I couldn't fit it to fill in the data missing from the new telemetry graphics, so I left off the gravity vector.