Encyclopedia Astronautica
Delta 6925


American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4A + 1 x EELT Thor/RS-27+ 1 x Delta K + 1 x Star 48B

LEO Payload: 3,981 kg (8,776 lb) to a 185 km orbit. Payload: 1,446 kg (3,187 lb) to a GTO.

Status: Retired 1992.
Gross mass: 218,000 kg (480,000 lb).
Payload: 3,981 kg (8,776 lb).
Height: 38.10 m (124.90 ft).
Diameter: 2.44 m (8.00 ft).
Thrust: 3,480.60 kN (782,470 lbf).
Apogee: 185 km (114 mi).
First Launch: 1989.02.14.
Last Launch: 1992.07.24.
Number: 13 .

More... - Chronology...


Associated Countries
Associated Spacecraft
  • HS 376 American communications satellite. 56 launches, 1980.11.15 (SBS 1) to 2003.09.27 (E-Bird). Mass 654 kg at beginning-of-life in geosynchronous orbit. Spin stabilized at 50 rpm by 4 hydrazine thrusters with 136 kg propellant. More...
  • GPS Block 2 and 2A American navigation satellite. 28 launches, 1989.02.14 (USA 35) to 1997.11.06 (USA 134). The Navstar GPS constellation worked in concert with ground receivers to give precise location information to military and civilian users anywhere in the world. More...
  • Eurostar 1000 French communications satellite. 4 launches, 1990.10.30 (Inmarsat 2 F1) to 1992.04.15 (Inmarsat 2 F4). The Eurostar 1000 platform was the first generation of Matra Marconi Space GEO satellite platforms serving mainly commercial telecoms applications. More...
  • DUVE Japanese earth atmosphere satellite. One launch, 1992.07.24. Diffuse Ultraviolet Explorer package bolted to Delta 2 2nd stage. More...
  • Geotail Japanese earth magnetosphere satellite. One launch, 1992.07.24. Measured magnetosphere and Earth's geomagnetic tail; Diffuse Ultraviolet Explorer package bolted to Delta 2 second stage. More...

Associated Engines
  • RS-27A Rocketdyne Lox/Kerosene rocket engine. 1054.2 kN. . Isp=302s. Replaced the RS-27 as the main system for the Delta and in the MA- 5A for the Atlas. RS2701B main engine, and twin LR101-NA-11 verniers. First flight 1989. More...
  • Star 48 Thiokol solid rocket engine. 67.2 kN. Used in Delta 3900; Conesotga; PAM-S; PAM-D. Total flown included in total for Star-48-8. Total impulse 575,682 kgf-sec. Motor propellant mass fraction 0.946. Isp=286s. First flight 1982. More...

See also
  • Delta The Delta launch vehicle was America's longest-lived, most reliable, and lowest-cost space launch vehicle. Development began in 1955 and it continued in service in the 21st Century despite numerous candidate replacements. More...

Associated Manufacturers and Agencies
  • Douglas American manufacturer of rockets, spacecraft, and rocket engines. Boeing Huntington Beach, Huntington Beach, CA, USA. More...

Associated Programs
  • Navstar The Navstar GPS (Global Positioning System) program was a joint service effort directed by the United States Department of Defence. Navstar GPS is a space-based radio-positioning system nominally consisting of a 24-satellite constellation that provides navigation and timing information to military and civilian users worldwide. In addition to the satellites, the system consists of a worldwide satellite control network and GPS receiver units that acquire the satellite's signals and translate them into position information. Originally envisioned as primarily a military system, GPS was found to have a wide variety of civilian applications, many of them never conceived by the original system's designers. More...
  • Thor Comsat The Thor communication satellites are orbited by Telenor of Norway and provide television services to Scandinavia. Thor 1 satellite was originally orbited by British Satellite Broadcasting as Marcopolo 2. It was purchased on orbit in 1992 from BSB. More...

Associated Launch Sites
  • Cape Canaveral America's largest launch center, used for all manned launches. Today only six of the 40 launch complexes built here remain in use. Located at or near Cape Canaveral are the Kennedy Space Center on Merritt Island, used by NASA for Saturn V and Space Shuttle launches; Patrick AFB on Cape Canaveral itself, operated the US Department of Defense and handling most other launches; the commercial Spaceport Florida; the air-launched launch vehicle and missile Drop Zone off Mayport, Florida, located at 29.00 N 79.00 W, and an offshore submarine-launched ballistic missile launch area. All of these take advantage of the extensive down-range tracking facilities that once extended from the Cape, through the Caribbean, South Atlantic, and to South Africa and the Indian Ocean. More...
  • Cape Canaveral LC17B Delta launch complex. Part of a dual launch pad complex built for the Thor ballistic missile program in 1956. Upgraded over the decades for use with Thor, Delta, Delta II, and Delta III launch vehicles, it remained in use for over half a century. More...
  • Cape Canaveral LC17A Delta launch complex. Part of a dual launch pad complex built for the Thor ballistic missile program in 1956. Pad 17A supported Thor, Delta, and Delta II launches into the 21st Century. More...

Associated Stages
  • Castor 4A Solid propellant rocket stage. Loaded/empty mass 11,743/1,529 kg. Thrust 478.31 kN. Vacuum specific impulse 266 seconds. More...
  • Delta K N2O4/Aerozine-50 propellant rocket stage. Loaded/empty mass 6,954/950 kg. Thrust 43.63 kN. Vacuum specific impulse 319 seconds. More...
  • Delta Thor XLT Lox/Kerosene propellant rocket stage. Loaded/empty mass 101,700/5,690 kg. Thrust 1,032.00 kN. Vacuum specific impulse 295 seconds. More...
  • PAM-D Solid propellant rocket stage. Loaded/empty mass 2,141/232 kg. Thrust 67.16 kN. Vacuum specific impulse 292 seconds. More...

Delta 6925 Chronology


1989 February 14 - . 18:30 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D184.
  • USA 35 - . Payload: GPS 2-1 / GPS SVN 14. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 19802 . COSPAR: 1989-013A. Apogee: 21,758 km (13,519 mi). Perigee: 21,480 km (13,340 mi). Inclination: 56.6000 deg. Period: 777.00 min. Summary: First launch of second generation / operational Global Positioning System. Placed in Plane E Slot 1 of the constellation. Suffered a shutdown of its onboard reaction wheels on March 26, 2000. Decommissioned on April 14, 2000 and replaced by GPS 2R-4..

1989 June 10 - . 22:19 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D185.
  • USA 38 - . Payload: GPS 2-2 / GPS SVN 13. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20061 . COSPAR: 1989-044A. Apogee: 20,514 km (12,746 mi). Perigee: 19,849 km (12,333 mi). Inclination: 54.8000 deg. Period: 718.00 min. Summary: Global Positioning System. Placed in Plane B Slot 3..

1989 August 18 - . 05:58 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D186.
  • USA 42 - . Payload: GPS 2-3 / GPS SVN 16. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20185 . COSPAR: 1989-064A. Apogee: 21,576 km (13,406 mi). Perigee: 21,509 km (13,365 mi). Inclination: 56.4000 deg. Period: 773.80 min. Summary: Global Positioning System. Retired..

1989 October 21 - . 09:31 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D188.
  • USA 47 - . Payload: GPS 2-4 / GPS SVN 19. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20302 . COSPAR: 1989-085A. Apogee: 21,236 km (13,195 mi). Perigee: 21,190 km (13,160 mi). Inclination: 53.3000 deg. Period: 760.20 min. Summary: Global Positioning System. Placed in Plane A Slot 5..

1989 December 11 - . 18:10 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17B. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D190.
  • USA 49 - . Payload: GPS 2-5 / GPS SVN 17. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20361 . COSPAR: 1989-097A. Apogee: 20,371 km (12,657 mi). Perigee: 19,992 km (12,422 mi). Inclination: 55.4000 deg. Period: 718.00 min. Summary: Global Positioning System. Placed in Plane D Slot 3..

1990 January 24 - . 22:55 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D191.
  • USA 50 - . Payload: GPS 2-6 / GPS SVN 18. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20452 . COSPAR: 1990-008A. Apogee: 21,226 km (13,189 mi). Perigee: 21,168 km (13,153 mi). Inclination: 55.0000 deg. Period: 759.50 min. Summary: Global Positioning System. Retired..

1990 March 26 - . 02:45 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D193.
  • USA 54 - . Payload: GPS 2-7 / GPS SVN 20. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20533 . COSPAR: 1990-025A. Apogee: 21,156 km (13,145 mi). Perigee: 20,960 km (13,020 mi). Inclination: 53.7000 deg. Period: 753.80 min. Summary: Global Positioning System. Declared unusable on 21 May 1996 at 22:42 following two uncommanded changes in frequency standards..

1990 August 2 - . 05:39 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D197.
  • USA 63 - . Payload: GPS 2-8 / GPS SVN 21. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20724 . COSPAR: 1990-068A. Apogee: 20,468 km (12,718 mi). Perigee: 19,896 km (12,362 mi). Inclination: 54.7000 deg. Period: 718.00 min. Summary: Global Positioning System. Placed in Plane E Slot 2..

1990 August 18 - . 00:42 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17B. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D198.
  • Thor 1 / BSB-R2 - . Payload: Marco Polo 2. Mass: 1,220 kg (2,680 lb). Nation: Norway. Agency: BSB. Program: Thor Comsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: HS 376. USAF Sat Cat: 20762 . COSPAR: 1990-074A. Apogee: 35,794 km (22,241 mi). Perigee: 35,779 km (22,231 mi). Inclination: 0.0000 deg. Period: 1,436.10 min. UK DBS; 31 deg W. Direct broadcasting system. Expected operational life 12.5 yr. Owner/operator: British Sky Broadcasting Ltd, 6 Centaurs Business Park, Grant Way, Isleworth, Middlesex TW7 5QD. Sold on-orbit in 1992 to Telenor Norway and redesignated Thor 1. Positioned in geosynchronous orbit at 50 deg W in 1990; 31 deg W in 1991-1992; 1 deg W in 1992-1999 As of 3 September 2001 located at 0.72 deg W drifting at 0.001 deg E per day. As of 2007 Mar 9 located at 61.51W drifting at 3.830W degrees per day.

1990 October 1 - . 21:56 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D199.
  • USA 64 - . Payload: GPS 2-9 / GPS SVN 15. Mass: 1,665 kg (3,670 lb). Nation: USA. Agency: USAF. Manufacturer: Seal Beach. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2 and 2A. USAF Sat Cat: 20830 . COSPAR: 1990-088A. Apogee: 20,363 km (12,652 mi). Perigee: 20,002 km (12,428 mi). Inclination: 55.4000 deg. Period: 718.00 min. Summary: Global Positioning System. Placed in Plane D Slot 5..

1990 October 30 - . 23:16 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17B. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D200.
  • Inmarsat 2 F1 - . Mass: 1,385 kg (3,053 lb). Nation: International. Agency: Inmarsat. Manufacturer: Toulouse. Program: Inmarsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: Eurostar 1000. USAF Sat Cat: 20918 . COSPAR: 1990-093A. Apogee: 35,800 km (22,200 mi). Perigee: 35,775 km (22,229 mi). Inclination: 1.7000 deg. Period: 1,436.20 min. Mobile communications; 64.5 deg E. Positioned in geosynchronous orbit at 65 deg E in 1990-1996; 179 deg E in 1996-1999 As of 5 September 2001 located at 178.97 deg E drifting at 0.004 deg W per day. As of 2007 Mar 8 located at 143.50E drifting at 0.015W degrees per day.

1991 March 8 - . 23:03 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17B. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D203.
  • Inmarsat 2 F2 - . Mass: 1,385 kg (3,053 lb). Nation: International. Agency: Inmarsat. Manufacturer: Toulouse. Program: Inmarsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: Eurostar 1000. USAF Sat Cat: 21149 . COSPAR: 1991-018A. Apogee: 35,793 km (22,240 mi). Perigee: 35,780 km (22,230 mi). Inclination: 2.2000 deg. Period: 1,436.10 min. Mobile and maritime communications; 15.5 deg W. Positioned in geosynchronous orbit at 15 deg W in 1991-1996; 55 deg W in 1997-1999; DRIFT As of 6 September 2001 located at 97.95 deg W drifting at 0.002 deg W per day. As of 2007 Mar 11 located at 97.96W drifting at 0.006W degrees per day.

1992 July 24 - . 14:26 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6925. LV Configuration: Delta 6925 D212.
  • Geotail - . Payload: Geotail. Mass: 1,008 kg (2,222 lb). Nation: Japan. Agency: ISAS. Class: Earth. Type: Magnetosphere satellite. Spacecraft: Geotail. USAF Sat Cat: 22049 . COSPAR: 1992-044A. Apogee: 399,941 km (248,511 mi). Perigee: 57,448 km (35,696 mi). Inclination: 18.0000 deg. Period: 18,904.40 min. Measured magnetosphere and Earth's geomagnetic tail. To investigate the structure and dynamics of the geomagnetic tail that extends on the nightside of the Earth. Launch time 1426 GMT. Launching states Japan and the United States of America. Launching organization NASA.
  • DUVE - . Payload: DUVE. Nation: Japan. Agency: MDAC. Class: Earth. Type: Seismology satellite. Spacecraft: DUVE. Decay Date: 1993-03-16 . USAF Sat Cat: 22050 . COSPAR: 1992-044B. Apogee: 1,413 km (877 mi). Perigee: 215 km (133 mi). Inclination: 27.4000 deg. Period: 101.17 min. Summary: Diffuse Ultraviolet Explorer package bolted to Delta 2 2nd stage..

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