Key statistics
Satellite PRAETORIAN SDA_603 at a glance.
Uptime
41
Days in orbit
Revolutions
≈ 13.9
Per day
Orbit
LEO
Low Earth Orbit
Inclination
81.3
Latest
Satellite identification and parameters
Extended collection of information and parameters for PRAETORIAN SDA_603.
Object identification
Identified? True
Debris? False
Object name: PRAETORIAN SDA_603
International designator: 2025-203B
Object number (NORAD): 65566
Object ID (CCSDS): 65566
Country: UNITED STATES OF AMERICA (US)
Current information (Y/N): Y
Orbital parameters
Period: 103.944 minutes
Inclination: 81.3036 deg
SMA: 7323.083 km
Apoapsis: 953.039 km
Periapsis: 936.856 km
RAAN: 232.4367 deg
Eccentricy: 0.00110491
Argument of periapsis: 117.8411 deg
Mean anomaly: 242.3867 deg
Mean motion: 13.85357485 rev/day
Mean motion (dot): 0.00000099 rev/day2
B* drag term: 0.000076425336 1/REarth
Two-line elements (TLE)
Creation date: Oct. 21, 2025, 3:26 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 20, 2025, 8:43 p.m. UTC
TLE line 0: 0 PRAETORIAN SDA_603
TLE line 1: 1 65566U 25203B 25293.86361401 .00000099 00000-0 76425-4 0 9996
TLE line 2: 2 65566 81.3036 232.4367 0011049 117.8411 242.3867 13.85357485 5585
Live tracking on map
Real-time ground track for satellite PRAETORIAN SDA_603.
In-orbit conjunctions
There are no conjunctions computed for PRAETORIAN SDA_603, at the moment. Check back to stay up to date, as we update our databases every day.
Go to all conjunctionsAssociated space launch
Tranche 1 Transport Layer B 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 York Space Systems.
PRAETORIAN SDA_603 was lifted into orbit during the mission ‘Falcon 9 Block 5 | SDA Tranche 1 Transport Layer B’, on board a Falcon 9 space rocket.
The launch took place on Sept. 10, 2025, 2:12 p.m. from Space Launch Complex 4E.
For more information about the launch, click the button.
Falcon 9 Block 5 | SDA Tranche 1 Transport Layer B
Agency: Space Development Agency
Status: Launch Successful
Launch date: Sept. 10, 2025, 2:12 p.m. UTC
Rocket: Falcon 9
Launch pad: Space Launch Complex 4E
Location: Vandenberg SFB, CA, USA
...
Latest news about this satellite
New U.S. military satellite constellation takes shape with first launch from Vandenberg SFB
The Space Development Agency’s Proliferated Warfighter Space Architecture constellation is expected to deliver global coverage beginning in 2027. Launch from Vandenberg Space Force Base occurred at 7:12 a.m. PDT (10:12 a.m. EDT / 1412 UTC).
SpaceX launches 21 satellites for Space Development Agency ‘Transport Layer’ military network
The satellites, made by York Space Systems, make up the first plane of a mesh network projected to have 126 spacecraft The post SpaceX launches 21 satellites for Space Development Agency ‘Transport Layer’ military network appeared first on SpaceNews.
Live coverage: Space Development Agency, SpaceX to launch next-gen national security satellites
The 21 satellites from York Space Systems are the first in the SDA’s Tranche 1 Transport Layer satellite constellation. SpaceX is targeting liftoff from pad 4 East at Vandenberg Space Force Base at 7:12 a.m. PDT (10:12 a.m. EDT / 1412 UTC).
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