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Other Designations: Defense Support Program. Class: Early Warning. Nation: United States. Agency: USAF. Manufacturer: TRW.
The Block 14 DSP satellites are the third generation of DSP vehicles. Cost is about $180M per spacecraft. Spacecraft: Spacecraft spin slowly (6 rpm) about the nadir axis to permit scanning of the Earth by the detector system. Zero momentum stabilised using a reaction wheel to counter the spacecraft spin. Four solar panels deploy to generate roughly 1300 W. Radiation hardened. Payload: Payload classified, but thought to include telescope with 6000 element IR array, nuclear explosion detectors, particle detection monitors.
Design Life: 7 to 9 years. Total Length: 10.0 m. Maximum Diameter: 4.0 m. Total Mass: 2,358 kg.
DSP Block 14 Chronology
14 June 1989
USA 39 Launch Site: Cape Canaveral . Launch Vehicle: Titan 4. Mass: 2,360 kg. Perigee: 35,699 km. Apogee: 35,614 km. Inclination: 3.1 deg.
First Titan 4 launch.
13 November 1990
USA 65 Launch Site: Cape Canaveral . Launch Vehicle: Titan 4. Mass: 2,360 kg. Perigee: 35,614 km. Apogee: 35,699 km. Inclination: 3.1 deg.
25 November 1991
USA 75 Launch Site: Cape Canaveral . Launch Vehicle: Shuttle. Mass: 2,355 kg. Perigee: 35,795 km. Apogee: 35,787 km. Inclination: 2.5 deg.
Military early warning; deployed form STS 44 11/25/91.
22 December 1994
DSP F17 Launch Site: Cape Canaveral . Launch Vehicle: Titan 4. Mass: 2,355 kg. Perigee: 35,780 km. Apogee: 35,790 km. Inclination: 0.0 deg.
09 April 1999
DSP F19 Launch Site: Cape Canaveral . Launch Vehicle: Titan 4B. FAILURE: IUS first and second stages failed to separate. Perigee: 720 km. Apogee: 35,800 km. Inclination: 28.0 deg.
The DSP F19 payload was a USAF Defense Support Program missile early warning satellite equipped with an infrared telescope to detect rocket launches. The Titan 4B placed the IUS upper stages and payload into a 188 km x 718 km x 28.6 deg parking orbit. The first stage of the IUS burned at 18:14 GMT and put the second stage and payload into a geosynchronous transfer orbit. The IUS second stage fired at 23:34 GMT. However, the two stages of the IUS failed to separate completely. At least one connector remained attached. This meant the second stage motor nozzle did not extend properly. When the stage fired, the vehicle tumbled during the burn. The DSP was left out of control in a useless orbit.
08 May 2000
DSP F20 (USA 149) Launch Site: Cape Canaveral . Launch Vehicle: Titan 4B. Perigee: 35,780 km. Apogee: 35,790 km. Inclination: 0.0 deg.
Early warning satellite for the US Air Force. Delivered by the two-stage IUS-22 solid rocket into geostationary orbit. Fullfilled mission of DSP 19 launched in 1999 into the wrong orbit when its IUS stage failed.
- 2 - McDowell, Jonathan, The United Nations Registry of Space Objects, Harvard University, 1997. HTML when accessed: http://hea-www.harvard.edu/QEDT/jcm/space/un/un.html
- 6 - JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. HTML when accessed: http://msl.jpl.nasa.gov/home.html
- 127 - Vis, Bert, Spaceflight, "Shuttle Weather Watch", 1996, Volume 38, page 170.
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Last update 12 March 2001.
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