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USSF-⁠627

Falcon 9Vandenberg, California

T minus 6 days 2 hours 7 minutes
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Webcast starts Tue 10 Nov ·

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Mission

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.

Falcon 9 will launch USSF-⁠627 from Space Launch Complex 4E (SLC-⁠4E) at Vandenberg Space Force Base in California. Following stage separation, the first stage will land on the Of Course I Still Love You droneship, about 574 km downrange.

Mission briefing from SpaceX

SpaceX is targeting Monday, November 9 for a Falcon 9 launch of the USSF-⁠627 mission from Space Launch Complex 4E (SLC-⁠4E) at Vandenberg Space Force Base in California. The four-⁠hour launch window opens at 7:03 p.m. PT. If needed, there is a backup opportunity on Tuesday, November 10 at 6:49 p.m. PT.

A live webcast of the USSF-⁠627 mission will begin about 10 minutes prior to liftoff, which you can watch here and on X @SpaceX.

This will be the seventh flight for the first stage booster supporting this mission, which previously launched NROL-⁠179, SDA-⁠T1TL-⁠E, SDA-⁠T1TL-⁠A, and three Starlink missions. Following stage separation, the first stage will land on the Of Course I Still Love You droneship, which will be stationed in the Pacific Ocean.

There is the possibility that residents of Santa Barbara, San Luis Obispo, and Ventura counties may hear one or more sonic booms during the launch, but what residents experience will depend on weather and other conditions.

Liftoff
Mon 19:03 PST at the pad
Window
– 4 h
Rocket
Falcon 9 Block 5SpaceX
Destination
Low Earth Orbit
Launch site
Space Launch Complex 4E, Vandenberg, California70th launch from this pad in 20263 days after the last
Sonic boom
There is the possibility that residents of Santa Barbara, San Luis Obispo, and Ventura counties may hear one or more sonic booms during the launch, but what residents experience will depend on weather and other conditions.
Latest update
GO for launch.

7th

Flight of B1103

574km

Downrange landing, OCISLY

126th

SpaceX launch of 2026

31days

Since B1103’s last flight

Countdown

All times approximate, in your time zone (CET)Timeline: SpaceX

  1. T minus 38 minutesSpaceX Launch Director verifies go for propellant load
  2. T minus 35 minutesRP-⁠1 (rocket grade kerosene) loading begins
  3. T minus 35 minutes1st stage LOX (liquid oxygen) loading begins
  4. T minus 16 minutes2nd stage LOX loading begins
  5. T minus 7 minutesFalcon 9 begins engine chill prior to launch
  6. T minus 1 minuteCommand flight computer to begin final prelaunch checks
  7. T minus 1 minutePropellant tank pressurization to flight pressure begins
  8. T minus 45 secondsSpaceX Launch Director verifies go for launch
  9. T minus 3 secondsEngine controller commands engine ignition sequence to start
  10. T minus 0 secondsFalcon 9 liftoff

Flight

From liftoff to orbit

  1. SLC-4E
  2. OCISLY574 km downrange
  3. LiftoffT+00:00:00
  4. Max QT+00:01:07
  5. Stage separationT+00:02:29
  6. FairingT+00:02:58
  7. LandingT+00:08:11
  1. SLC-4E
  2. OCISLY574 km downrange
  3. LiftoffT+00:00:00
  4. Stage separationT+00:02:29
  5. LandingT+00:08:11
  1. SLC-4E
  2. OCISLY574 km downrange
  3. LiftoffT+00:00:00
  4. Max QT+00:01:07
  5. Stage separationT+00:02:29
  6. FairingT+00:02:58
  7. LandingT+00:08:11
Schematic, not to scale. Tap a moment for more.Point at a moment for more.SpaceX’s graphic
Planschematic

8 min from liftoffin your time zone (CET)

  1. T plus 1 minute 7 secondsMax Q (moment of peak mechanical stress on the rocket)
  2. T plus 2 minutes 26 seconds1st stage main engine cutoff (MECO)
  3. T plus 2 minutes 29 seconds1st and 2nd stages separate
  4. T plus 2 minutes 36 seconds2nd stage engine starts (SES-⁠1)
  5. T plus 2 minutes 58 secondsFairing separation, 2nd stage
  6. T plus 6 minutes 6 seconds1st stage entry burn begins
  7. T plus 6 minutes 30 seconds1st stage entry burn ends
  8. T plus 7 minutes 52 seconds1st stage landing burn begins
  9. T plus 8 minutes 11 seconds1st stage landing

Falcon 9 Block 5

SpaceXReusable644 launches since May 2018, 643 successful

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  • BoosterB1103most recently launched SDA Tranche 1 Transport Layer A
About Falcon 9 Block 5

Falcon 9 is a two-stage rocket designed and manufactured by SpaceX for the reliable and safe transport of satellites and the Dragon spacecraft into orbit. The Block 5 variant is the fifth major interval aimed at improving upon the ability for rapid reusability.

70m

Height

3.7m

Diameter

549t

Mass at liftoff

7.6MN

Thrust at liftoff

23t

Payload to low Earth orbit

8.3t

Payload to geostationary transfer orbit

Orbit estimated from CelesTrak’s elementsMeasured trackSpaceX’s predicted path

In orbit now

The crewed stations and Hubble, once around the Earth every 92 to 94 minutes

SpacecraftAltitudeSpeed
ISSDocked: Soyuz MS-⁠29, Crew-⁠13In sunlight426km27,569km/h
TiangongDocked: Shenzhou-⁠23In Earth’s shadow384km27,658km/h
HubbleIn sunlight474km27,471km/h

Estimated for from CelesTrak’s orbital elements, up to 21 h old.

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