Encyclopedia Astronautica
Delta 6920-X


Three stage vehicle consisting of 9 x Castor 4A + 1 x EELT Thor/RS-27+ 1 x Delta K with 3.05 m (10 foot) diameter fairing

Status: Retired 1992.
Gross mass: 219,000 kg (482,000 lb).
Height: 39.00 m (127.00 ft).
Diameter: 2.44 m (8.00 ft).
Thrust: 3,790.00 kN (852,020 lbf).
Apogee: 1,000 km (600 mi).
First Launch: 1990.06.01.
Last Launch: 1992.06.07.
Number: 2 .

More... - Chronology...


Associated Countries
Associated Spacecraft
  • ROSAT German x-ray astronomy satellite. One launch, 1990.06.01. West German extreme UV, X-ray telescope; all-sky survey. More...
  • EUVE American ultraviolet astronomy satellite. One launch, 1992.06.07. The EUVE Extreme Ultra-Violet Explorer mission mapped space in the 70- to 760-angstrom portion of the spectrum and conducted detailed ultraviolet examinations of selected celestial targets. 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...

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 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 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-C Lox/Kerosene propellant rocket stage. Loaded/empty mass 101,900/5,900 kg. Thrust 1,054.20 kN. Vacuum specific impulse 302 seconds. More...

Delta 6920-X Chronology


1990 June 1 - . 21:48 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6920-X. LV Configuration: Delta 6920-10 D195.
  • ROSAT - . Mass: 2,426 kg (5,348 lb). Nation: Germany. Agency: DLR. Class: Astronomy. Type: X-ray astronomy satellite. Spacecraft: ROSAT. Decay Date: 2011-10-23 . USAF Sat Cat: 20638 . COSPAR: 1990-049A. Apogee: 554 km (344 mi). Perigee: 539 km (334 mi). Inclination: 53.0000 deg. Period: 95.60 min. Summary: West German extreme UV, X-ray telescope; all-sky survey..

1992 June 7 - . 16:40 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 6920-X. LV Configuration: Delta 6920-10 D210.
  • EUVE - . Mass: 3,275 kg (7,220 lb). Nation: USA. Agency: NASA Greenbelt. Class: Astronomy. Type: X-ray astronomy satellite. Spacecraft: EUVE. Decay Date: 2002-01-31 . USAF Sat Cat: 21987 . COSPAR: 1992-031A. Apogee: 524 km (325 mi). Perigee: 510 km (310 mi). Inclination: 28.4000 deg. Period: 95.00 min. Extreme Ultra-Violet Explorer; mapped galactic EUV sources. The Extreme Ultraviolet Explorer was switched off on February 2, 2001. NASA decided to terminate funding for the mission, even though the spacecraft was still operating well. The sky survey was completed in January 1993 and after that the EUVE was used by guest astronomers for observations of specific targets. The final observations were made on January 26, 2001. After end-of-life tests of the never-used backup high voltage supplies and checking the remaining battery capacity, EUVE was stabilized pointing away from the Sun and sent into safehold at 2359 GMT on January 31. The transmitters were commanded off on February 2.

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