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SpaceX

USSF-259

Falcon 9 Block 5

T-minus to liftoff

HOURS

MINUTES

SECONDS

Wednesday September 16 2026, 01:00:00 UTC

StatusGo

Scrub riskLOW

Go95%

VehicleFalcon 9 Block 5

OrbitPolar Orbit

PadSpace Launch Complex 4E

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Acquiring satellite view…

Trajectory unknown

2 hazard areas

Space Launch Complex 4E

Vandenberg SFB, CA, USA

34.632, -120.611

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Mission

USSF-259 is a classified mission for the United States Space Force.

Reusable Hardware

All boosters →

First Stage · Flight-provenB1097

active13th flight

Flights12

Landings12/12100%

Fastest turn14d 3h

Targeting ASDS · OCISLY· 574 km downrange

27d 20h since last flight

Falcon 9 booster.

Previous flights · 12

Q's read

Weather & scrubLOW risk

Weather Go95%Wind5 m/sGusts6 m/sCloud90%Temp16°C

Limiting rule: Droneship recovery upper limit on sea state.

6.8 ≥ 6 ft significant wave height

Hazards (1)

HYDROPAC 2517/26. SOUTH PACIFIC. 1. HAZARDOUS OPERATIONS, SPACE DEBRIS 0001Z TO 2330Z DAILY 07 THRU 19 SEP IN AREAS BOUND BY: A. 36-30.00S 177-30.00W, 34-15.00S 171-30.00W, 35-45.00S 170-30.00W, 38-00.00S 176-45.00W. B. 32-30.00S 165-00.00W, 30-30.00S 160-00.00W, 32-00.00S 159-00.00W, 34-00.00S 164-00.00W. 2. CANCEL THIS MSG 200030Z SEP 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+00:02:26

MECO

T+00:02:30

Stage 2 Separation

T+00:02:36

SES-1

T+00:02:57

Fairing Separation

T+00:06:03

Entry Burn Startup

T+00:06:24

Entry Burn Shutdown

T+00:07:58

Stage 1 Landing Burn

T+00:08:20

Stage 1 Landing

Quick facts

VehicleFalcon 9 Block 5

OrbitPolar Orbit

PadSpace Launch Complex 4E

SiteVandenberg SFB, CA, USA

WindowWednesday September 16 2026, 01:00:00 UTC→Wednesday September 16 2026, 05:00:00 UTC

Vehicle

FamilyFalcon

Height70 m

Diameter3.7 m

Stages2

ReusableYes

LEO capacity22,800 kg

Track record628/629 successful

Landings614/619