| USA-200 | |
| Names List: | NROL-28 |
| Mission Type: | SIGINT |
| Operator: | United States NRO |
| Cospar Id: | 2008-010A |
| Satcat: | 32706 |
| Launch Rocket: | Atlas V 411 (AV-006) |
| Launch Site: | Vandenberg, SLC-3E |
| Launch Contractor: | Lockheed Martin Commercial Launch Service |
| Orbit Reference: | Geocentric orbit |
| Orbit Regime: | Molniya orbit |
| Orbit Inclination: | 63.56° |
| Orbit Period: | 684.33 minutes |
| Apsis: | gee |
| Instruments: | Space-Based Infrared System (SBIRS-HEO 2) Magnetospheric science instrument (TWINS-B) |
| Insignia: | NROL-28 Mission Patch.png |
| Insignia Caption: | NROL-28 mission patch |
| Insignia Size: | 200px |
USA-200, also known as NRO Launch 28 or NROL-28, is an American signals intelligence satellite, operated by the National Reconnaissance Office. Launched in 2008, it has been identified as the second satellite in a series known as Improved Trumpet, Advanced Trumpet, or Trumpet follow-on; a replacement for the earlier Trumpet series of satellites.[1]
USA-200 was launched by an Atlas V launch vehicle, flying in the 411 configuration, operated by United Launch Alliance. The launch vehicle was the first Atlas V to launch from Vandenberg Air Force Base, flying from Space Launch Complex 3E.[2] Liftoff occurred at 10:02 UTC on 13 March 2008.[3] [4] It was identified as NRO Launch 28,[5] and was the thirteenth flight of an Atlas V. The launch vehicle had the tail number AV-006.[3]
The satellite's orbit and mission are officially classified, however like most classified spacecraft it has been located and tracked by amateur observers. It is in a Molniya orbit with a perigee of, an apogee of, and 63.56° of orbital inclination and 684.33 minutes of orbital period.[6]
In addition to its SIGINT payload, USA-200 also carries two secondary instruments; the SBIRS-HEO 2 missile detection payload as part of the Space-Based Infrared System programme, and NASA's TWINS-2 or TWINS-B magnetospheric science instrument as part of the TWINS programme.[1]