Encyclopedia Astronautica
Valley Forge


American manufacturer. Valley Forge, USA.

AKA: Lockheed Martin; Martin Marietta; GE.

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Associated Countries
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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...

Valley Forge Chronology


1997 January 17 - . 16:28 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 7925. LV Configuration: Delta 7925 D241. FAILURE: T+12 sec GEM strap-on number 2 structural failure.. Failed Stage: 0.
  • GPS 42 - . Payload: GPS 2R-1 / GPS SVN 42. Mass: 2,030 kg (4,470 lb). Nation: USA. Agency: MDSSC. Manufacturer: Valley Forge. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2R. COSPAR: F970117A. Summary: Destroyed in launch vehicle failure..

1997 July 23 - . 03:43 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 7925. LV Configuration: Delta 7925 D245.
  • USA 132 - . Payload: GPS 2R-2 / GPS SVN 43. Mass: 2,030 kg (4,470 lb). Nation: USA. Agency: USAF. Manufacturer: Valley Forge. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2R. USAF Sat Cat: 24876 . COSPAR: 1997-035A. Apogee: 20,235 km (12,573 mi). Perigee: 20,132 km (12,509 mi). Inclination: 55.8000 deg. Period: 718.00 min. Summary: Placed in Plane F Slot 3 of the constellation..

1997 October 25 - . 00:46 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas IIA. LV Configuration: Atlas IIA AC-131.
  • USA 135 - . Payload: DSCS III B-13. Nation: USA. Agency: USAF. Manufacturer: Valley Forge. Program: DSCS. Class: Communications. Type: Military communications satellite. Spacecraft: DSCS III. USAF Sat Cat: 25019 . COSPAR: 1997-065A. Apogee: 35,800 km (22,200 mi). Perigee: 35,770 km (22,220 mi). Inclination: 0.0000 deg. Summary: Geosynchronous. Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option..

1999 April 15 - . 18:32 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC2W. LV Family: Delta. Launch Vehicle: Delta 7920-X. LV Configuration: Delta 7920-10 D268.
  • Landsat 7 - . Mass: 1,969 kg (4,340 lb). Nation: USA. Agency: NASA Greenbelt. Manufacturer: Valley Forge. Program: Landsat. Class: Earth. Type: Earth resources satellite. Spacecraft: Landsat 7. USAF Sat Cat: 25682 . COSPAR: 1999-020A. Apogee: 703 km (436 mi). Perigee: 702 km (436 mi). Inclination: 98.2000 deg. Period: 98.80 min. The vehicle entered a 175 km x 706 km x 98.2 deg initial orbit. 57 minutes after launch the Delta stage burned again to circularize the orbit at 668 km x 698 km and Landsat 7 separated from the stage. The Delta stage then burned to depletion of its propellant, into a 184 km x 710 km x 107.5 deg orbit that would decay quickly. The Landsat 7 remote sensing satellite was to be operated by NASA/Goddard until October 2000, when operations would be transferred to the US Geological Survey.

1999 October 7 - . 12:51 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. Launch Pad: SLC17A. LV Family: Delta. Launch Vehicle: Delta 7925-9.5. LV Configuration: Delta 7925-9.5 D275.
  • USA 145 - . Payload: GPS 2R-3 / GPS SVN 46. Mass: 2,030 kg (4,470 lb). Nation: USA. Agency: USAF. Manufacturer: Valley Forge. Program: Navstar. Class: Navigation. Type: Navigation satellite. Spacecraft: GPS Block 2R. USAF Sat Cat: 25933 . COSPAR: 1999-055A. Apogee: 20,202 km (12,552 mi). Perigee: 20,163 km (12,528 mi). Inclination: 52.6000 deg. Period: 718.00 min. Summary: Third GPS Block 2R satellite. SVN 46 replaced SVN 50 which had been damaged by rain on Pad 17 earlier while being prepared for launch earlier in the year. Placed in Plane D Slot 2..

1999 December 18 - . 18:57 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC3E. LV Family: Atlas. Launch Vehicle: Atlas IIAS. LV Configuration: Atlas IIAS AC-141.
  • Terra - . Payload: EOS-AM1. Mass: 4,854 kg (10,701 lb). Nation: USA. Agency: NASA Greenbelt. Manufacturer: Valley Forge. Class: Earth. Type: Seismology satellite. Spacecraft: Terra. USAF Sat Cat: 25994 . COSPAR: 1999-068A. Apogee: 703 km (436 mi). Perigee: 702 km (436 mi). Inclination: 98.2000 deg. Period: 98.80 min. Summary: First launch in NASA's Earth Observing System program. Terra carried multispectral imagers, a radiation budget instrument, a detector to measure CO and methane pollution, and an instrument to study cloud top and vegetation properties..

2000 January 21 - . 01:03 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. Launch Pad: SLC36A. LV Family: Atlas. Launch Vehicle: Atlas IIA. LV Configuration: Atlas IIA AC-138.
  • USA 148 - . Payload: DSCS III B-8. Mass: 1,232 kg (2,716 lb). Nation: USA. Agency: USAF. Manufacturer: Valley Forge. Program: DSCS. Class: Communications. Type: Military communications satellite. Spacecraft: DSCS III. USAF Sat Cat: 26052 . COSPAR: 2000-001A. Apogee: 35,790 km (22,230 mi). Perigee: 35,780 km (22,230 mi). Inclination: 0.0000 deg. Summary: Part of the US Air Force Defense Satellite Communications System. To be stationed in geosynchronous orbit over the Pacific Ocean..

2000 October 20 - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. Launch Pad: SLC36A. LV Family: Atlas. Launch Vehicle: Atlas IIA. LV Configuration: Atlas IIA AC-140 MLV-9.
  • USA 153 - . Payload: DSCS III B-11. Mass: 1,235 kg (2,722 lb). Nation: USA. Agency: USAF. Manufacturer: Valley Forge. Program: DSCS. Class: Communications. Type: Military communications satellite. Spacecraft: DSCS III. USAF Sat Cat: 26575 . COSPAR: 2000-065A. Apogee: 35,790 km (22,230 mi). Perigee: 35,780 km (22,230 mi). Inclination: 0.0000 deg. Military Communications satellite. Launch delayed from October 12 by spacecraft problem. The US Air Force Defense Satellite Communications System satellite was placed by the Centaur upper stage into a 148 km x 898 km x 29.3 deg parking orbit. A second burn put it into a 218 km x 35,232 km x 26.0 deg transfer orbit. The DSCS III B-11 IABS-8 apogee stage, with two Primex R4D liquid apogee engines, circularised the orbit at geostationary altitude on October 21 and then separated from the DSCS.

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