· space brief · 4 min read
Space Brief 15 Sep 2025
Discover the latest in satellite tracking with key topics covering the launch of Tranche 1 satellites for the Space Development Agency, a record-setting Transporter-15 mission by Exolaunch, and new defense-focused satellite connectivity solutions by Satlink and Rivada.

📰Top Stories
Rivada Partners with Satlink for Secure Satellite Connectivity
Satlink has teamed up with Rivada Space Networks to provide cutting-edge satellite connectivity solutions tailored for Spain’s defense and enterprise sectors. The partnership leverages Rivada’s planned low Earth orbit (LEO) constellation, with over $17 billion in global commitments. This initiative marks a significant step in enhancing secure communications infrastructures.
Read the full story: Space War
First Tranche 1 Satellites Launched for Space Development Agency Network
The U.S. Space Systems Command has successfully launched 21 satellites for the Proliferated Warfighter Space Architecture (PWSA) Transport Layer, marking the inaugural Tranche 1 launch from Vandenberg Space Force Base. The mission, executed by SpaceX’s Falcon 9, supports advanced global data transport capabilities.
Read the full story: Space War
Exolaunch Set for Record-Breaking Transporter-15 Mission
Exolaunch is preparing to deploy 59 satellites on the upcoming Transporter-15 rideshare mission with SpaceX. This marks the company’s largest mission to date, involving over 30 customers from 16 countries. The mission underscores Exolaunch’s reliability and their expanding presence in the satellite launch services market.
Read the full story: Space Daily
SpaceX Scheduled for Saturday Starlink Launch
SpaceX has confirmed their Falcon 9 launch is on track for Saturday, aiming to deliver 24 Starlink satellites into low Earth orbit. The liftoff is set to occur from Vandenberg Space Force Base at 1:55 p.m. EDT. This mission continues SpaceX’s efforts to expand their global satellite internet coverage.
Read the full story: Space Daily
🛰️Satellite Spotlight
- Satellite Name: COSMOS 1477
- NORAD ID: 14175
- Launch Date: July 6, 1983
- Mission: Military Communication
- Orbit: Low Earth Orbit (LEO)
- Operator: GUKOS
- Fun Fact: The COSMOS 1477 satellite is part of the Strela communications system, which was designed for secure military communications during the Cold War.
Track this satellite in real-time on our web app: Track COSMOS 1477
🌌Space Weather
Next 24 Hours
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Radio Blackouts Probability
- Minor: 25
- Major: 1
- Risk: None
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Solar Radiation
- Probability: 1
- Risk: None
-
Geomagnetic Storming
- Scale: 3
- Impact: strong
- Activity: High
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Impact Summary
- Next 24 hours: No risk of radio blackouts and no risk of solar radiation storms.
- High geomagnetic activity with strong geomagnetic storms expected, reaching G1 (Minor) storm levels on 15 Sep due to CIR effects followed by negative polarity CH HSS influences.
- Radiation outlook indicates no S1 (Minor) or greater solar radiation storms anticipated, with no significant active regions producing radiation storm potential.
- Isolated R1-R2 (Minor-Moderate) radio blackouts are possible through 17 Sep.
Long Term Forecast
- Impact Summary
- Forecast for Solar and Geomagnetic Activity from 15 September - 11 October 2025 indicates low solar activity with a chance for isolated M-class flares.
- No proton events are expected at geosynchronous orbit.
- Greater than 2 MeV electron flux at geosynchronous orbit is anticipated to reach high levels on 18-21 Sep and 06-11 Oct due to recurrent CH HSS influences, with normal to moderate levels expected for the remaining period.
- Geomagnetic activity is expected to reach G2 (Moderate) storm levels on 15 Sep due to negative polarity CH HSS influences, with active to G1 (Minor) storm levels on 16 Sep, 28-29 Sep, 03-07 Oct, and 11 Oct.
- Quiet to unsettled levels are expected for the remaining days in the outlook period.
🚀Upcoming Space Launches
September 16
- China Aerospace Science and Technology Corporation Long March 2C/YZ-1S:
- Unknown Payload from Jiuquan Satellite Launch Center, People’s Republic of China (00:58 UTC)
- Details TBD.
September 17
- SpaceX Falcon 9 Block 5:
- Starlink Group 17-12 from Vandenberg SFB, CA, USA (15:41 UTC) A batch of 24 satellites for the Starlink mega-constellation - SpaceX’s project for space-based Internet communication system.
September 18
-
SpaceX Falcon 9 Block 5:
- Starlink Group 10-61 from Cape Canaveral SFS, FL, USA (09:30 UTC) A batch of 28 satellites for the Starlink mega-constellation - SpaceX’s project for space-based Internet communication system.
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Blue Origin New Shepard:
- NS-35 from Corn Ranch, Van Horn, TX, USA (12:30 UTC) This flight will fly more than 40 scientific and research payloads to space and back, including 24 experiments from NASA’s TechRise Student Challenge and other educational institutions.
September 21
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SpaceX Falcon 9 Block 5:
- Starlink Group 10-27 from Cape Canaveral SFS, FL, USA (09:20 UTC) A batch of 28 satellites for the Starlink mega-constellation - SpaceX’s project for space-based Internet communication system.
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SpaceX Falcon 9 Block 5:
- NROL-48 from Vandenberg SFB, CA, USA (17:37 UTC) Eleventh batch of satellites for a reconnaissance satellite constellation built by SpaceX and Northrop Grumman for the National Reconnaissance Office.
September 22
- Rocket Lab HASTE:
- JENNA from Wallops Flight Facility, Virginia, USA (23:45 UTC) Sub-orbital launch under Rocket Lab’s Hypersonic Accelerator Suborbital Test Electron (HASTE) program, details TBD.
September 23
- SpaceX Falcon 9 Block 5:
- IMAP & others from Kennedy Space Center, FL, USA (11:32 UTC) IMAP is a NASA mission to study interactions between solar wind and the local interstellar medium, carrying a suite of 10 scientific instruments. The launch also includes NOAA’s SWFO-L1 space weather satellite and the GLIDE mission to study the Earth’s exosphere.
September 24
- SpaceX Falcon 9 Block 5:
- Starlink Group 10-15 from Cape Canaveral SFS, FL, USA (08:36 UTC) A batch of 28 satellites for the Starlink mega-constellation - SpaceX’s project for space-based Internet communication system.
Note: Launch dates and times are subject to change due to technical or weather considerations.
Maurice Stellarski