Encyclopedia Astronautica
Delta 7925H


American orbital launch vehicle. Four stage vehicle consisting of 9 x GEM-46 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B

LEO Payload: 5,089 kg (11,219 lb) to a 185 km orbit. Payload: 1,818 kg (4,008 lb) to a GTO.

Status: Active.
Gross mass: 231,870 kg (511,180 lb).
Payload: 5,089 kg (11,219 lb).
Height: 38.10 m (124.90 ft).
Diameter: 2.44 m (8.00 ft).
Thrust: 3,110.00 kN (699,150 lbf).
Apogee: 185 km (114 mi).
First Launch: 2007.09.27.
Number: 1 .

More... - Chronology...


Associated Countries
Associated Spacecraft
  • Dawn American asteroid probe. One launch, 2007.09.27. Asteroid belt unmanned probe designed to first orbit and survey the asteroid Vesta, and then fly on to the largest asteroid, Ceres. Orbit asteroids Ceres and Vesta. 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 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...

Associated Stages
  • 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...
  • GEM 46 Solid propellant rocket stage. Loaded/empty mass 19,327/2,282 kg. Thrust 628.31 kN. Vacuum specific impulse 278 seconds. Nine 1168-mm (46 in.) diameter Alliant graphite epoxy motors (GEM LDXLs) (strap-on solid rocket motors - SSRMs) augment the first-stage performance of the Delta III and were a direct evolution from the GEMs used on Delta II. 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 7925H Chronology


2007 September 27 - . 11:34 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17B. Launch Pad: SLC17B. LV Family: Delta. Launch Vehicle: Delta 7925H. LV Configuration: Delta 7925H D327.
  • Dawn - . Mass: 1,218 kg (2,685 lb). Nation: USA. Agency: Martin. Class: Surveillance. Type: Civilian surveillance satellite. Spacecraft: Dawn. USAF Sat Cat: 32249 . COSPAR: 2007-043A. Asteroid belt unmanned probe designed to first orbit and survey the asteroid Vesta, and then fly on to the largest asteroid, Ceres. The Delta upper stage boosted the spacecraft and PAM-D solid third stage to 9.01 km/sec and a 185 km x 6835 km orbit. The PAM-D fired at 12:29 GMT and released Dawn after accelerating it to 11.50 km/sec and sending it into a 1.00 AU x 1.62 AU x 0.5 deg solar orbit. The ion engines were ignited on 6 October. Using its ion engines and a Mars flyby in February 2009, Dawn was scheduled to reach Vesta in 2011 and Ceres in 2015.

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