Encyclopedia Astronautica
UHF


US Navy communications satellite network; Ultra High Frequency Follow On.

More... - Chronology...


Associated Countries
Associated Spacecraft
  • HS 601 American communications satellite bus. First launch 1990.01.09. 3-axis unified ARC 22 N and one Marquardt 490 N bipropellant thrusters, Sun and Barnes Earth sensors and two 61 Nms 2-axis gimbaled momentum bias wheels. More...

Associated Launch Vehicles
  • Atlas I American orbital launch vehicle. The Atlas I launch vehicle was derived from the Atlas G, and included the same basic vehicle components (Atlas booster and Centaur upper stage). Significant improvements in the guidance and control system were made with an emphasis on replacing analog flight control components with digital units interconnected with a digital data bus. More...
  • Atlas II American orbital launch vehicle. The Atlas II booster was 2.7-meters longer than an Atlas I and included uprated Rocketdyne MA-5A engines. The Atlas I vernier engines were replaced with a hydrazine roll control system. The Centaur stage was stretched 0.9-meters compared to the Centaur I stage. Fixed foam insulation replaced Atlas I's jettisonable insulation panels. The original Atlas II model was developed to support the United States Air Force Medium Launch Vehicle II program. Its Centaur used RL10A-3-3A engines operating at an increased mixture ratio. The first Atlas II flew on 7 December 1991, successfully delivering AC-102/Eutelsat II F3 to orbit. More...
  • Atlas IIA American orbital launch vehicle. Atlas IIA was a commercial derivative of the Atlas II developed for the US Air Force. Higher performance RL10A-4 (or RL10A-4-1) engines replaced Atlas II's RL10A-3-3A engines. More...

Associated Manufacturers and Agencies
  • USN American agency overseeing development of rockets, spacecraft, and rocket engines. USN Joint Task Force 7, USA. More...
  • HCI American agency. Hughes Communications Inc. , 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...

UHF Chronology


1993 March 25 - . 21:38 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas I. LV Configuration: Atlas I AC-74 / Centaur I 5054. FAILURE: Atlas engine failure. Loss of booster engine thrust resulted in a lower-than planned 1560 km x 1900 km orbit. Failed Stage: 1.
  • UHF F1 - . Payload: UHF F/O F1. Mass: 2,866 kg (6,318 lb). Nation: USA. Agency: HCI. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. Completed Operations Date: 1993-07-01 . USAF Sat Cat: 22563 . COSPAR: 1993-015A. Apogee: 36,098 km (22,430 mi). Perigee: 36,053 km (22,402 mi). Inclination: 21.1000 deg. Period: 1,450.90 min. US Navy communications; Ultra High Frequency Follow On; unusable orbit. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle was to have put payload into subsynchronous earth orbit with MRS trajectory option. As of 28 August 2001 located at 45.55 deg W drifting at 3.676 deg W per day. As of 2007 Mar 10 located at 95.89E drifting at 3.687W degrees per day.

1993 September 3 - . 11:17 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas I. LV Configuration: Atlas I AC-75 / Centaur I 5055.
  • USA 95 - . Payload: UHF F/O F2. Mass: 2,844 kg (6,269 lb). Nation: USA. Agency: HCI. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 22787 . COSPAR: 1993-056A. Apogee: 35,805 km (22,248 mi). Perigee: 35,767 km (22,224 mi). Inclination: 5.0000 deg. Period: 1,436.10 min. US Navy communications. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into subsynchronous earth orbit with MRS trajectory option. Positioned in geosynchronous orbit at 72 deg E in 1993-1999.

1994 June 24 - . 13:50 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas I. LV Configuration: Atlas I AC-76 / Centaur I 5056.
  • USA 104 - . Payload: UHF F/O F3. Mass: 2,847 kg (6,276 lb). Nation: USA. Agency: HCI. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 23132 . COSPAR: 1994-035A. Apogee: 35,795 km (22,241 mi). Perigee: 35,776 km (22,230 mi). Inclination: 4.8100 deg. Period: 1,436.05 min. Summary: US Navy communications . Stationed at 14.38 deg W 1995-1999. Launch vehicle put payload into subsynchronous earth orbit with MRS trajectory option..

1995 January 29 - . 01:25 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas II. LV Configuration: Atlas II AC-112 / Centaur II 8110.
  • USA 108 - . Payload: UHF F/O F4. Mass: 3,023 kg (6,664 lb). Nation: USA. Agency: HCI. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 23467 . COSPAR: 1995-003A. Apogee: 35,799 km (22,244 mi). Perigee: 35,775 km (22,229 mi). Inclination: 2.2000 deg. Period: 1,436.10 min. Summary: UHF Follow-On #4; US Navy communications . Stationed at 177.0 deg W. Launch vehicle put payload into subsynchronous earth orbit with MRS trajectory option. Positioned in geosynchronous orbit at 177 deg W in 1995-1999..

1995 May 31 - . 15:27 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas II. LV Configuration: Atlas II AC-116 / Centaur II.
  • USA 111 - . Payload: UHF F/O F5-EHF. Mass: 3,015 kg (6,646 lb). Nation: USA. Agency: USN. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 23589 . COSPAR: 1995-027A. Apogee: 35,796 km (22,242 mi). Perigee: 35,774 km (22,228 mi). Inclination: 4.8000 deg. Period: 1,436.10 min. Summary: UHF Follow-On #5; US Navy communications . Stationed at 72.3 deg E. Launch vehicle put payload into subsynchronous earth orbit with MRS trajectory option. Positioned in geosynchronous orbit at 72 deg E in 1995-1999..

1995 October 22 - . 08:00 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas II. LV Configuration: Atlas II AC-119 / Centaur II.
  • USA 114 - . Payload: UHF F/O F6-EHF. Mass: 3,015 kg (6,646 lb). Nation: USA. Agency: USN. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 23696 . COSPAR: 1995-057A. Apogee: 35,797 km (22,243 mi). Perigee: 35,776 km (22,230 mi). Inclination: 5.0000 deg. Period: 1,436.10 min. Summary: UHF Follow-On #6; US Navy communications. Stationed at 105.3 deg W. Launch vehicle put payload into subsynchronous earth orbit with MRS trajectory option. Positioned in geosynchronous orbit at 105 deg W in 1995-1999..

1996 July 25 - . 12:42 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. LV Family: Atlas. Launch Vehicle: Atlas II. LV Configuration: Atlas II AC-125.
  • USA 127 - . Payload: UHF F/O F7-EHF. Mass: 3,015 kg (6,646 lb). Nation: USA. Agency: HCI. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 23967 . COSPAR: 1996-042A. Apogee: 35,791 km (22,239 mi). Perigee: 35,784 km (22,235 mi). Inclination: 4.9000 deg. Period: 1,436.20 min. Summary: Positioned in geosynchronous orbit at 170 deg W in 1996; 23 deg W in 1996-1999; 100 deg W in 1999. As of 29 July 1999) 99.21 deg W drifting at 0.011 deg W per day. As of 2007 Feb 22 located at 21.85W drifting at 0.014W degrees per day..

1998 March 16 - . 21:32 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36A. Launch Pad: SLC36A. LV Family: Atlas. Launch Vehicle: Atlas II. LV Configuration: Atlas II AC-132.
  • USA 138 - . Payload: UHF F/O F8-EHF. Nation: USA. Agency: USN. Manufacturer: El Segundo. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 25258 . COSPAR: 1998-016A. Apogee: 35,803 km (22,246 mi). Perigee: 35,771 km (22,227 mi). Inclination: 3.3000 deg. Period: 1,436.10 min. UHF Follow-On F8 was the first Block III UHF Follow-On satellite, replacing the old FLTSATCOM satellites. It carried UHF, EHF and Ka-band transponders, including a video broadcast payload. This was the last Atlas II launch; future Atlas launches would use the Atlas IIA, IIAS and III models. Positioned in geosynchronous orbit at 172 deg E in 1998-1999.

1998 October 20 - . 07:19 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-130.
  • USA 140 - . Payload: UHF F/O F9. Mass: 3,200 kg (7,000 lb). Nation: USA. Agency: USN. Manufacturer: El Segundo. Program: UHF. Class: Technology. Type: Navigation technology satellite. Spacecraft: HS 601. USAF Sat Cat: 25501 . COSPAR: 1998-058A. Apogee: 35,806 km (22,248 mi). Perigee: 35,773 km (22,228 mi). Inclination: 3.8000 deg. Period: 1,436.20 min. The orbit at burnout of the Centaur was 286 km x 25866 km x 27.0 degree. Modification of the orbit to a geostationary 38,300 km circular x 0.0 degree inclination was accomplished by the Marquardt R-4D liquid propellant motor on the HS-601 spacecraft. The satellite carried UHF and EHF transponders for naval communications, and a Ka-band Global Broadcast Service video relay package. Launch mass of 3200 kg dropped to 1550 kg once geostationary orbit was reached. UHF F/O F9 was placed over the Atlantic Ocean in geosynchronous orbit at 174 deg W in 1998; 22 deg W in 1999. Additional Details: here....

1999 November 23 - . 04:06 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. Launch Pad: SLC36B. LV Family: Atlas. Launch Vehicle: Atlas IIA. LV Configuration: Atlas IIA AC-136.
  • USA 146 - . Payload: UHF F/O F10. Nation: USA. Agency: USN. Manufacturer: El Segundo. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 25967 . COSPAR: 1999-063A. Apogee: 35,796 km (22,242 mi). Perigee: 35,777 km (22,230 mi). Inclination: 3.9000 deg. Period: 1,436.10 min. Summary: UHF Follow-on satellite providing UHF and EHF communications, and Global Broadcast Service television for the US Navy. Positioned in geosynchronous orbit at 173 deg W in 1999; 72 deg E in 2000-2003..

2003 December 18 - . 02:30 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. Launch Pad: SLC36B. LV Family: Atlas V. Launch Vehicle: Atlas 3B SEC. LV Configuration: Atlas 3B-SEC AC-203.
  • USA 174 - . Payload: UFO F/O F11. Nation: USA. Agency: USN. Program: UHF. Class: Communications. Type: Military communications satellite. Spacecraft: HS 601. USAF Sat Cat: 28117 . COSPAR: 2003-057A. Apogee: 35,798 km (22,243 mi). Perigee: 35,781 km (22,233 mi). Inclination: 4.2000 deg. Period: 1,436.20 min. Summary: The last UHF Follow-On communications satellite for the US Navy. The satellite provided fleet communications from geostationary orbit..

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