SpaceXFalcon 9 Block 5Space Launch Complex 4E, Vandenberg SFB, CA, USA
SDA Tranche 1 Transport Layer C
Launched
October 15, 2025 · 23:06 UTC
Image: SpaceX
Summary
SDA Tranche 1 Transport Layer C launched on a SpaceX Falcon 9 Block 5 from Space Launch Complex 4E, Vandenberg SFB, CA, USA on October 15, 2025 at 23:06 UTC. It was SpaceX's 583rd launch, 134th this year and humanity's 7,085th orbital launch attempt. It was the 490th Falcon 9 Block 5 flight and the 129th this year. Booster B1093 flew for the 7th time and landed at Of Course I Still Love You. The payload was bound for Polar Orbit (PO). The tracked orbit of SDA-1664, one of 21 catalogued objects, from October 27, 2025, was 952 × 957 km inclined 81.3°. 21 objects from this launch are catalogued, all of them payloads.
- Watch
- Vehicle
- Falcon 9 Block 5 · SpaceX
- Booster
- B1093 · flight 7 · Autonomous Spaceport Drone Ship at Of Course I Still Love You · landed209/217 landed here · 35 days after its previous flight, SDA Tranche 1 Transport Layer B · 650 km downrange
- Mission
- Government/Top Secret · Polar Orbit (PO)for SDA
- Milestone
- 490th Falcon 9 Block 5 flight · 129th this yearSpaceX's 583rd launch134th this yearhumanity's 7,085th orbital launch attempt236th orbital launch attempt this year
Flight preview
Simulate in Flight ClubOrbit: as tracked
SDA-1664 · NORAD 65974 · 2025-230 · Space-Track · tracking 1 of 21 objects
Show the numbers for orbit elements
- Object
- SDA-1664
- Object ID
- 2025-230A
- Epoch
- 2025-10-27 20:33:00 UTC
- Mean motion
- 13.84694947 rev/day
- Eccentricity
- 0.00035835
- Inclination
- 81.298°
- Ascending node
- 67.161°
- Arg. of perigee
- 78.083°
- Mean anomaly
- 282.0728°
- Element set
- 999
- Rev at epoch
- 165
- B*
- 0.00018791512
Perigee, apogee and period are Kepler figures from the catalogued mean elements, not a propagated state. Published orbit: PO.
Flight timeline
- T−0Liftoff
- T+1M12SMax-Q
- T+2M29SMECO
- T+2M33SStage 2 Separation
- T+2M40SSES-1
- T+3M16SFairing Separation
- T+6M33SEntry Burn Startup
- T+6M58SEntry Burn Shutdown
- T+8M17SStage 1 Landing Burn
- T+8M33SSECO-1
- T+8M41SStage 1 Landing
Catalogued objects
21 catalogued: 21 payloads; 21 still in orbit
- SDA-1664 · NORAD 65974 · in orbit
- SDA-1665 · NORAD 65975 · in orbit
- SDA-1666 · NORAD 65976 · in orbit
- SDA-1667 · NORAD 65977 · in orbit
- SDA-1668 · NORAD 65978 · in orbit
- SDA-1669 · NORAD 65979 · in orbit
- SDA-1670 · NORAD 65980 · in orbit
- SDA-1671 · NORAD 65981 · in orbit
- SDA-1672 · NORAD 65982 · in orbit
- SDA-1673 · NORAD 65983 · in orbit
- SDA-1674 · NORAD 65984 · in orbit
- SDA-1675 · NORAD 65985 · in orbit
Show 9 more payloads
- SDA-1676 · NORAD 65986 · in orbit
- SDA-1677 · NORAD 65987 · in orbit
- SDA-1678 · NORAD 65988 · in orbit
- SDA-1679 · NORAD 65989 · in orbit
- SDA-1680 · NORAD 65990 · in orbit
- SDA-1681 · NORAD 65991 · in orbit
- SDA-1682 · NORAD 65992 · in orbit
- SDA-1683 · NORAD 65993 · in orbit
- SDA-1684 · NORAD 65994 · in orbit
Data from J. McDowell, planet4589.org
About this launch
Tranche 1 Transport Layer C is one of six missions by the United States Space Force Space Development Agency (SDA) for the Proliferated Warfighter Space Architecture (PWSA) Tranche 1 Transport Layer constellation, which will provide assured, resilient, low-latency military data and connectivity worldwide to the full range of warfighter platforms from Low Earth Orbit satellites. The constellation will be interconnected with Optical Inter-Satellite Links (OISLs) which have significantly increased performance over existing radio frequency crosslinks. It is expected to operate over Ka band, have stereo coverage and be dynamically networked for simpler hand-offs, greater bandwidth and fault tolerance. This launch carries 21 satellites manufactured by Lockheed Martin.
Pad
Space Launch Complex 4E, Vandenberg SFB, CA, USA
223rd launch from Space Launch Complex 4E, 49th this year · 837th from Vandenberg SFB, CA, USA
Local pad time at liftoff: Oct 15, 4:06 PM PDT, in daylight
303 launches from this pad · 919 from Vandenberg SFB, CA, USA
7 days 19 hours after the previous launch from this pad
Updates
Launch success.
Show 9 earlier updates
Payload separation.
Cosmic_Penguin · 10/16/2025 · source
Unofficial Re-stream by SPACE AFFAIRS has started
LL2 · 10/15/2025 · source
Liftoff.
Cosmic_Penguin · 10/15/2025 · source
Now targeting Oct 15 at 23:06 UTC
Cosmic_Penguin · 10/15/2025 · source
Now targeting Oct 15 at 23:04 UTC
Cosmic_Penguin · 10/15/2025 · source
Scrubbed for the day.
Cosmic_Penguin · 10/14/2025 · source
Holding at T-37:31.
Cosmic_Penguin · 10/14/2025 · source
Tweaked T-0.
Cosmic_Penguin · 10/14/2025 · source
Tweaked T-0.
Cosmic_Penguin · 10/13/2025 · source
Questions
When did SDA Tranche 1 Transport Layer C launch?
SDA Tranche 1 Transport Layer C launched on October 15, 2025 at 23:06 UTC.
Where can I watch SDA Tranche 1 Transport Layer C?
Coverage: SpaceX SDA Tranche 1 Transport Layer C; Watch live: SpaceX launches SDA Tranche 1 satellites from California on Falcon 9 rocket; SDA Tranche 1 Transport Mission. Watch the replay
What rocket launched SDA Tranche 1 Transport Layer C?
Falcon 9 Block 5, flown by SpaceX. Falcon 9 Block 5 spec sheet
Where did SDA Tranche 1 Transport Layer C launch from?
Space Launch Complex 4E, Vandenberg SFB, CA, USA. Liftoff was Oct 15, 4:06 PM PDT local time at the pad.
Did the booster land?
Booster B1093 flew for the 7th time and landed at Of Course I Still Love You.
What orbit did SDA Tranche 1 Transport Layer C reach?
The tracked orbit of SDA-1664, one of 21 catalogued objects, from October 27, 2025, was 952 × 957 km inclined 81.3°.
How many satellites did SDA Tranche 1 Transport Layer C launch?
21 payloads from this launch are catalogued, 21 of them still in orbit (Data from J. McDowell, planet4589.org).