Encyclopedia Astronautica
SDS


American military communications satellite. 7 launches, 1976.06.02 (SDS no. 1) to 1987.02.12 (USA 21). SDS satellites, put into Molniya-type orbits, provided data relay services for optical reconnaissance and other military spacecraft.

Gross mass: 700 kg (1,540 lb).
First Launch: 1976.06.02.
Last Launch: 1987.02.12.
Number: 7 .

More... - Chronology...


Associated Countries
See also
  • Titan The Titan launch vehicle family was developed by the United States Air Force to meet its medium lift requirements in the 1960's. The designs finally put into production were derived from the Titan II ICBM. Titan outlived the competing NASA Saturn I launch vehicle and the Space Shuttle for military launches. It was finally replaced by the USAF's EELV boosters, the Atlas V and Delta IV. Although conceived as a low-cost, quick-reaction system, Titan was not successful as a commercial launch vehicle. Air Force requirements growth over the years drove its costs up - the Ariane using similar technology provided lower-cost access to space. More...

Associated Launch Vehicles
  • Titan American orbital launch vehicle. The Titan launch vehicle family was developed by the United States Air Force to meet its medium lift requirements in the 1960's. The designs finally put into production were derived from the Titan II ICBM. Titan outlived the competing NASA Saturn I launch vehicle and the Space Shuttle for military launches. It was finally replaced by the USAF's EELV boosters, the Atlas V and Delta IV. Although conceived as a low-cost, quick-reaction system, Titan was not successful as a commercial launch vehicle. Air Force requirements growth over the years drove its costs up - the Ariane using similar technology provided lower-cost access to space. More...
  • Titan 34B American orbital launch vehicle. Stretched Titan core, originally developed for Titan 3M MOL, with Agena D upper stage. Guidance provided by the Agena upper stage. The Agena and its payload were completely enclosed in a 3.05 m diameter shroud. 'Ascent Agena' seperated after orbital insertion and did not remain attached to the payload. More...

Associated Manufacturers and Agencies
  • USAF American agency overseeing development of rockets and spacecraft. United States Air Force, USA. More...

Bibliography
  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.
  • JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Web Address when accessed: here.
  • McDowell, Jonathan, Launch Log, October 1998. Web Address when accessed: here.

Associated Launch Sites
  • Vandenberg Vandenberg Air Force Base is located on the Central Coast of California about 240 km northwest of Los Angeles. It is used for launches of unmanned government and commercial satellites into polar orbit and intercontinental ballistic missile test launches toward the Kwajalein Atoll. More...
  • Vandenberg SLC4W Titan, Atlas launch complex. First designated PALC2-3 and used to launch Atlas Agena D with KH-7 spysats. Rebuilt in 1966 to handle Titan 3B with various military payloads. From 1988 used to launch refurbished surplus Titan 2 ICBM's in space launch role. More...

SDS Chronology


1976 June 2 - . 20:56 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 34B. LV Configuration: Titan 34B 34B-5 (3B-55) / Ascent Agena D.
  • SDS no. 1 - . Payload: SDS no. 1 / OPS 7837. Mass: 700 kg (1,540 lb). Nation: USA. Agency: NRO; USAF. Class: Communications. Type: Military communications satellite. Spacecraft: SDS. USAF Sat Cat: 8871 . COSPAR: 1976-050A. Apogee: 39,315 km (24,429 mi). Perigee: 380 km (230 mi). Inclination: 63.3000 deg. Period: 703.80 min.

1976 August 6 - . 22:21 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 34B. LV Configuration: Titan 34B 34B-6 (3B-56) / Ascent Agena D.
  • SDS no. 2 - . Payload: SDS no. 2 / OPS 7940. Mass: 700 kg (1,540 lb). Nation: USA. Agency: NRO; USAF. Class: Communications. Type: Military communications satellite. Spacecraft: SDS. USAF Sat Cat: 9270 . COSPAR: 1976-080A. Apogee: 39,315 km (24,429 mi). Perigee: 380 km (230 mi). Inclination: 63.3000 deg. Period: 703.80 min. Summary: Satellite Data Systems 2..

1978 August 5 - . 05:00 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 34B. LV Configuration: Titan 34B 34B-7 (3B-57) / Ascent Agena D.
  • SDS no. 3 - . Payload: SDS no. 3 / OPS 7310. Mass: 700 kg (1,540 lb). Nation: USA. Agency: NRO; USAF. Class: Communications. Type: Military communications satellite. Spacecraft: SDS. Decay Date: 2001-02-08 . USAF Sat Cat: 10993 . COSPAR: 1978-075A. Apogee: 39,053 km (24,266 mi). Perigee: 315 km (195 mi). Inclination: 62.5000 deg. Period: 697.10 min.

1980 December 13 - . 16:04 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 34B. LV Configuration: Titan 34B 34B-3 (3B-53).
  • SDS no. 4 - . Payload: SDS no. 4 / OPS 5805. Mass: 700 kg (1,540 lb). Nation: USA. Agency: NRO; USAF. Class: Communications. Type: Military communications satellite. Spacecraft: SDS. USAF Sat Cat: 12093 . COSPAR: 1980-100A. Apogee: 39,130 km (24,310 mi). Perigee: 250 km (150 mi). Inclination: 63.8000 deg. Period: 697.40 min.

1984 August 28 - . 18:03 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 34B. LV Configuration: Titan 34B 34B-4 (3B-64) / Ascent Agena D.
  • USA 4 - . Payload: SDS no. 5. Mass: 700 kg (1,540 lb). Nation: USA. Agency: NRO; USAF. Class: Communications. Type: Military communications satellite. Spacecraft: SDS. USAF Sat Cat: 15226 . COSPAR: 1984-091A. Apogee: 39,975 km (24,839 mi). Perigee: 380 km (230 mi). Inclination: 63.3000 deg. Period: 717.80 min. Summary: Satellite Data Systems 2..

1985 February 8 - . 06:10 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 34B. LV Configuration: Titan 34B 34B-10 (3B-69) / Ascent Agena D.
  • USA 9 - . Payload: SDS no. 6. Mass: 700 kg (1,540 lb). Nation: USA. Agency: NRO; USAF. Class: Communications. Type: Military communications satellite. Spacecraft: SDS. USAF Sat Cat: 15546 . COSPAR: 1985-014A. Apogee: 39,775 km (24,714 mi). Perigee: 400 km (240 mi). Inclination: 63.0000 deg. Period: 717.80 min. Summary: Satellite Data Systems 2..

1987 February 12 - . 06:40 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC4W. LV Family: Titan. Launch Vehicle: Titan 34B. LV Configuration: Titan 34B 34B-51 (3B-66) / Ascent Agena D.
  • USA 21 - . Payload: SDS no. 7. Mass: 700 kg (1,540 lb). Nation: USA. Agency: NRO; USAF. Class: Communications. Type: Military communications satellite. Spacecraft: SDS. USAF Sat Cat: 17506 . COSPAR: 1987-015A. Apogee: 39,750 km (24,690 mi). Perigee: 610 km (370 mi). Inclination: 63.4000 deg. Period: 718.10 min.

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