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USA-171
Launch of USA-171
Mission typeSIGINT
OperatorNRO/CIA
COSPAR ID2003-041A
Spacecraft properties
Spacecraft typeOrion
ManufacturerNorthrop Grumman
Start of mission
Launch date9 September 2003 04:29 UTC
RocketTitan IV (401)B/Centaur-T (B-36/TC-20)
Launch siteCape Canaveral, SLC-40
ContractorLockheed Martin
Orbital parameters
Reference systemGeocentric orbit
RegimeGeosynchronous orbit
← USA-139 (Orion-4)
USA-202 (Orion-6) →

USA-171 (also known Orion-5, Homer and NROL-19) is an American SIGINT reconnaissance satellite which is operated by the National Reconnaissance Office. Launched in September 2003, it is the secret Orion satellite.[1][2][3][4]

Overview

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This is the last Orion satellite launch on Titan IV rocket and last launch of Titan IV (401)B/Centaur-T Version and last Titan IV launch with extremely long metallic fairing and future Orion mission will launch on the Delta IV Heavy rocket.[5]

Orion also known as Mentor is a SIGINT/ELINT satellite build to replace Magnum satellite[6] and the COMINT capability also made Orion a replacement for the Mercury satellite.[7] It is called that the satellite has a reflector of a diameter as big as ~100m[8][9]

See also

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References

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  1. ^ "Orion 5, 6, 7, 8, 9, 10, 11, 12". Gunter's Space Page. Retrieved 16 October 2025.
  2. ^ "Orion 5 (USA-171) (NROL-19) | Titan IV(401)B | Next Spaceflight". nextspaceflight.com. Retrieved 18 October 2025.
  3. ^ "National Reconnaissance Office Launch (NROL) series satellites". rammb.cira.colostate.edu. Retrieved 18 October 2025.
  4. ^ "Titan IVB | NROL-19 Mission". RocketLaunch.org. Retrieved 18 October 2025.
  5. ^ "Orion 5 (USA-171) (NROL-19) | Titan IV(401)B | Next Spaceflight". nextspaceflight.com. Retrieved 18 October 2025.
  6. ^ "Orion 1, 2 (Magnum 1, 2)". Gunter's Space Page. Retrieved 19 October 2025.
  7. ^ "Mercury 14, 15, 16 ('Advanced Vortex 1, 2, 3')". Gunter's Space Page. Retrieved 18 October 2025.
  8. ^ "Orion 5, 6, 7, 8, 9, 10, 11, 12". Gunter's Space Page. Retrieved 16 October 2025.
  9. ^ "Advanced Orion". www.astronautix.com. Retrieved 17 October 2025.
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