CLASSIFIED
OTB
US Military Technology Demonstrator (Hosted NASA Deep Space Atomic Clock) · US Air Force / NASA (Hosted Payload)
Right now
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OTB (Orbital Test Bed), a US Air Force satellite hosting multiple experimental payloads including the Deep Space Atomic Clock — a NASA technology demonstration that tested an ultra-precise atomic clock small and stable enough for future deep-space navigation, potentially letting spacecraft determine their own position without waiting for round-trip signals from Earth.
Its orbit
- Orbit
- Low Earth Orbitcan appear as a fast-moving star at dawn or dusk
- Altitude
- 439–448 mi (706–721 km)
- Inclination
- 24.0°
- One orbit
- 98.9 minutes14.6 orbits a day
- NORAD ID
- 44341
- Int’l designator
- 2019-036C
- Launched
- 2019
Orbital elements from CelesTrak, as of 21 Sep 2026.
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- PRAETORIAN SDA_502US Military Mesh Communications (PWSA Transport Layer)
- PRAETORIAN SDA_503US Military Mesh Communications (PWSA Transport Layer)
- PRAETORIAN SDA_504US Military Mesh Communications (PWSA Transport Layer)
- PRAETORIAN SDA_505US Military Mesh Communications (PWSA Transport Layer)