Satellite Data System
The primary purpose of the SDS satellites is to relay imagery from low-flying reconnaissance satellites, notably the Keyhole optic reconnaissance and Lacrosse/Onyx radar reconnaissance satellites to ground stations in the United States.[1]
The SDS-2 is significantly more massive at 5150 pounds (2335 kg), with three separate communication dishes, including one for a K band downlink. Two dishes are 15 feet (4.5 meters) in diameter, while the third is 6.6 feet (2 m) in diameter. The solar arrays generate 1238 watts of power. It is believed that the Space Shuttle has been used to launch several satellites, possibly on missions STS-28, STS-38, and STS-53. Other launches have used the Titan-4 rocket.
Quasar is the rumored code name for the communications satellite.
Satellites
Name | ID | Launch date | Launch vehicle | Launch site | NROL designation | Perigee | Apogee | Inclination | Remarks |
---|---|---|---|---|---|---|---|---|---|
First generation | |||||||||
OPS 7837 | 1976-050A | 1976-06-02 | Titan III(34)B | VAFB SLC-4W | N/A | ||||
OPS 7940 | 1976-080A | 1976-08-06 | Titan III(34)B | VAFB SLC-4W | |||||
OPS 7310 | 1978-075A | 1978-08-05 | Titan III(34)B | VAFB SLC-4W | |||||
OPS 5805 | 1980-100A | 1980-12-13 | Titan III(34)B | VAFB SLC-4W | |||||
USA-4 | 1978-091A | 1984-08-28 | Titan III(34)B | VAFB SLC-4W | |||||
USA-9 | 1985-014A | 1985-02-08 | Titan III(34)B | VAFB SLC-4W | |||||
USA-21 | 1987-015A | 1987-02-15 | Titan III(34)B | VAFB SLC-4W | |||||
Second generation | |||||||||
USA-40 | 1989-061B | 1989-06-02 | Space Shuttle Columbia STS-28/Orbus-21S |
KSC LC-39B | N/A | ||||
USA-67 | 1990-097B | 1990-11-15 | Space Shuttle Atlantis STS-38/Orbus-21S |
KSC LC-39A | Geosynchronous satellite, deployed along with Prowler and initially misidentified as a Magnum SIGINT spacecraft | ||||
USA-89 | 1992-086B | 1992-12-02 | Space Shuttle Discovery STS-53/Orbus-21S |
KSC LC-39A | |||||
USA-125 | 1996-038B | 1996-07-03 | Titan IV(405)A | CCAFS LC-40 | |||||
Third generation | |||||||||
USA-137 | 1998-005A | 1998-01-29 | Atlas IIA | CCAFS SLC-36A | NROL-5 | Capricorn | |||
USA-155 | 2000-080A | 2000-12-06 | Atlas IIAS | CCAFS SLC-36A | NROL-10 | Great Bear, geosynchronous satellite at 10° West | |||
USA-162 | 2001-046A | 2001-10-11 | Atlas IIAS | CCAFS SLC-36B | NROL-12 | Aquilla, geosynchronous satellite at 144° West | |||
USA-179 | 2004-034A | 2004-08-31 | Atlas IIAS | CCAFS SLC-36A | NROL-1 | Nemesis, final Atlas II launch | |||
USA-198 | 2007-060A | 2007-12-10 | Atlas V 401 | CCAFS SLC-41 | NROL-24 | Scorpius | |||
USA-227 | 2011-011A | 2011-03-11 | Delta IV-M+(4,2) | CCAFS SLC-37B | NROL-27 | Gryphon, geosynchronous satellite at 10° West, replaced USA-155 | |||
USA-236 | 2012-033A | 2012-06-20 | Atlas V 401 | CCAFS SLC-41 | NROL-38 | Drake, geosynchronous satellite at 144° West, replacement for USA-162 | |||
References
- ↑ Richelson J.T., 2001: The Wizards of Langley. Inside the CIA's Directorate of Science and Technology. Westview press, Boulder
- ↑ National Reconnaissance Office: "NRO Brochure circa 1997"
- Vick, Berman, Lindborg, Fellow (March 19, 1997). SDS-1 Military Communications Satellite. Federation of American Scientists. Accessed April 24, 2004.
- Vick, Berman, Lindborg, Fellow, Pike, Aftergood (March 19, 1997). SDS-2 Military Communications Satellite. Federation of American Scientists. Accessed April 24, 2004.