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SpaceX

USSF-366

Success

Falcon 9 Block 5

T-minus to liftoff

HOURS

MINUTES

SECONDS

Sunday August 16 2026, 01:50:45 UTC

StatusSuccess

Scrub riskLOW

Go95%

VehicleFalcon 9 Block 5

OrbitLow Earth Orbit

PadSpace Launch Complex 4E

Launch CodexDossier

Every source for this mission in one place — news, social, references, notes & the exact timeline.

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General trajectory

1 hazard area

Space Launch Complex 4E

Vandenberg SFB, CA, USA

Booster recovery

ASDS droneship· 615 km

Fairing recovery vessel· 673 km

Launching

Southeast

156° · SSE

34.632, -120.611

Orbital elements (TLE)

2 element sets

Orbit

Apogee265 km

Perigee256 km

Period89.7 min

Inclination70.02°

Launch heading 156° · SSE from USSF-366 PO.

Parking orbitUSSF-366 PO› conemedium

1 70169U 26186A 26228.08260417 .00000000 00000-0 00000-0 0 9994

2 70169 70.0179 067.6204 0081884 163.4441 351.8927 16.26456410 06

OrbitUSSF-366medium

1 70169U 26186A 26228.11466435 .00000000 00000-0 00000-0 0 9996

2 70169 70.0179 067.6157 0006920 342.9268 000.0000 16.05014307 09

Pre-launch TLEs from Dillon's Space Page. Estimated before flight — the real orbit is confirmed post-launch.

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Mission

USSF-366 is a classified mission for the United States Space Force. It is possibly a batch of classified LEO satellites based on SpaceX’s Starshield satellite bus, based on locations of rocket stage drop zones being exact fits with previous Starlink Group 15 launches.

Reusable Hardware

All boosters →

First Stage · Flight-provenB1088

active18th flight

Flights19

Landings19/19100%

Fastest turn9d 3h

Recovered · ASDS · OCISLY· 574 km downrange

48d 9h since last flight

Falcon 9 booster.

Previous flights · 19

Q's read

Weather & scrubLOW risk

Weather Go95%LL2 Go90%Wind8 m/sGusts10 m/sCloud75%Temp19°C

Limiting rule: No flight through cumulus cloud with top at or above the freezing level.

max cloud-top 3405 m above freezing 4721 m (70% cover in 10 nmi) · no GLM flashes within 25 nmi / 30 min, likely cirrus / stratiform ice rather than cumulus

Jellyfish potentialMap & details →

Faint

Hazards (1)All areas →Download pack

2286/2026space debrisAug 20, 22:29Z – Sep 20, 03:21Z
HYDROPAC 2286/26. SOUTH PACIFIC. 1. HAZARDOUS OPERATIONS, SPACE DEBRIS 152339Z TO 160417Z, 162325Z TO 170403Z, 172311Z TO 180349Z, 182257Z TO 190335Z, 192243Z TO 200321Z, 202229Z TO 210307Z, 212216Z TO 220254Z AUG IN AREA BOUND BY 27-59.00S 122-44.00W, 27-09.00S 120-43.00W, 38-21.00S 115-04.00W, 49-09.00S 107-22.00W, 59-09.00S 095-34.00W, 59-58.00S 099-05.00W, 44-34.00S 114-13.00W. 2. CANCEL THIS MSG 220354Z AUG 26.

Launch Timeline

Countdown

T-00:38:00

GO for Prop Load

T-00:35:00

Stage 1 LOX Load

T-00:35:00

Prop Load

T-00:16:00

Stage 2 LOX Load

T-00:07:00

Engine Chill

T-00:01:00

Startup

T-00:01:00

Tank Press

T-00:00:45

GO for Launch

T-00:00:03

Ignition

In-flight

T+00:00:00

Liftoff

T+00:01:07

Max-Q

T+00:02:25

MECO

T+00:02:29

Stage 2 Separation

T+00:02:36

SES-1

T+00:02:58

Fairing Separation

T+00:06:01

Entry Burn Startup

T+00:06:25

Entry Burn Shutdown

T+00:07:58

Stage 1 Landing Burn

T+00:08:20

Stage 1 Landing

Quick facts

VehicleFalcon 9 Block 5

OrbitLow Earth Orbit

PadSpace Launch Complex 4E

SiteVandenberg SFB, CA, USA

WindowSaturday August 15 2026, 21:52:00 UTC→Sunday August 16 2026, 01:52:00 UTC

Vehicle

FamilyFalcon

Height70 m

Diameter3.7 m

Stages2

ReusableYes

LEO capacity22,800 kg

Track record633/634 successful

Landings619/624