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UHF
Part of HS 601 Family
US Navy fleet communications from geostationary orbit; Ultra High Frequency Follow On; used the HS 601 commercial bus.

AKA: UFO.



Country: USA. Spacecraft: HS 601. Launch Vehicles: Atlas I, Atlas II, Atlas IIA. Launch Sites: Cape Canaveral. Agency: USN, HCI, El Segundo.

1993 March 25 - . 21:38 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC36B. LV Family: Atlas. Launch Vehicle: Atlas I. 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.
  • 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.
  • 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. 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.
  • 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. 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.
  • 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. 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.
  • 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. 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.
  • 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. 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.
  • USA 138 - . Payload: UHF F/O F8-EHF. Mass: 3,206 kg (7,068 lb). 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.
  • 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.
  • USA 146 - . Payload: UHF F/O F10. Mass: 3,206 kg (7,068 lb). 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. 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. Launch Vehicle: Atlas 3B.
  • USA 174 - . Payload: UFO F/O F11. Mass: 3,041 kg (6,704 lb). 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. The last UHF Follow-On communications satellite for the US Navy. The satellite provided fleet communications from geostationary orbit..


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