Encyclopedia Astronautica
ECS/OTS



ecsots.jpg
ECS-OTS
Credit: ESA
European communications satellite. 20 launches, 1977.09.13 (OTS 1) to 2001.02.07 (Skynet 4F).

The OTS/ECS satellites were the first European-developed operational communications satellites, after groundwork laid by two experimental French/German Symphonie satellites in the 1970s.

3-axis controlled, maintained by 2 x 25 Nms and 1 x 16 Nms momentum wheels, and 20 x 0.7 N / 8 N thrusters with 118 kg propellant. 1260 W generated by solar panels, feeding two 24 Ah NiCd batteries. On the Marecs series the spacecraft provided three repeaters: shore-to-ship with 5 MHz bandwidth, ship-to-shore with 6 MHz bandwidth, shore-to-shore with 0.5 MHz bandwidth. These provide 35 two-way voice channels plus search and rescue capabilities.

Gross mass: 1,490 kg (3,280 lb).
First Launch: 1977.09.13.
Last Launch: 2001.02.07.
Number: 20 .

More... - Chronology...


Associated Countries
See also
  • Ariane First successful European commercial launch vehicle, developed from L3S Europa launch vehicle replacement design. Development of the Ariane 1 was authorised in July 1973, took eight years, and cost 2 billion 1986 Euros. More...
  • 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...
  • Titan The Titan launch vehicle family was developed by the United States Air Force to meet its medium lift requirements in the 1960's. The designs finally put into production were derived from the Titan II ICBM. Titan outlived the competing NASA Saturn I launch vehicle and the Space Shuttle for military launches. It was finally replaced by the USAF's EELV boosters, the Atlas V and Delta IV. Although conceived as a low-cost, quick-reaction system, Titan was not successful as a commercial launch vehicle. Air Force requirements growth over the years drove its costs up - the Ariane using similar technology provided lower-cost access to space. More...

Associated Launch Vehicles
  • Delta American orbital launch vehicle. The Delta launch vehicle was America's longest-lived, most reliable, and lowest-cost space launch vehicle. Delta began as Thor, a crash December 1955 program to produce an intermediate range ballistic missile using existing components, which flew thirteen months after go-ahead. Fifteen months after that, a space launch version flew, using an existing upper stage. The addition of solid rocket boosters allowed the Thor core and Able/Delta upper stages to be stretched. Costs were kept down by using first and second-stage rocket engines surplus to the Apollo program in the 1970's. Continuous introduction of new 'existing' technology over the years resulted in an incredible evolution - the payload into a geosynchronous transfer orbit increasing from 68 kg in 1962 to 3810 kg by 2002. Delta survived innumerable attempts to kill the program and replace it with 'more rationale' alternatives. By 2008 nearly 1,000 boosters had flown over a fifty-year career, and cancellation was again announced. More...
  • Titan American orbital launch vehicle. The Titan launch vehicle family was developed by the United States Air Force to meet its medium lift requirements in the 1960's. The designs finally put into production were derived from the Titan II ICBM. Titan outlived the competing NASA Saturn I launch vehicle and the Space Shuttle for military launches. It was finally replaced by the USAF's EELV boosters, the Atlas V and Delta IV. Although conceived as a low-cost, quick-reaction system, Titan was not successful as a commercial launch vehicle. Air Force requirements growth over the years drove its costs up - the Ariane using similar technology provided lower-cost access to space. More...
  • Delta 3914 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4 + 1 x ELT Thor/RS-27 + 1 x Delta P /TR-201 + 1 x Star 37E More...
  • Ariane 1 French orbital launch vehicle. First version of the Ariane launch vehicle. More...
  • Ariane French orbital launch vehicle. First successful European commercial launch vehicle, developed from L3S Europa launch vehicle replacement design. Development of the Ariane 1 was authorised in July 1973, took eight years, and cost 2 billion 1986 Euros. More...
  • Ariane 2/3 French orbital launch vehicle. Improved version of the Ariane 1. It featured increased thrust first and second stage engines, a 25% stretched third stage, 4 seconds specific impulse improvement in the third stage, a larger internal payload fairing volume, and introduced the Sylda payload carrier for dual payloads. The Ariane 3 version added two solid rocket motor strap-ons. Development was authorised in July 1980 and had a total cost of 144 million 1986 Euros. More...
  • Delta 2 7000 American orbital launch vehicle. The Delta 7000 series used GEM-40 strap-ons with the Extra Extended Long Tank core, further upgraded with the RS-27A engine. More...
  • Ariane 3 French orbital launch vehicle. Four stage vehicle consisting of 2 x PAP solid rocket boosters + Ariane 2 core. More...
  • Ariane 44LP French orbital launch vehicle. Ariane 4 with 2 liquid rocket + 2 solid rocket strap-ons. More...
  • Ariane 44L French orbital launch vehicle. Ariane 4 with 4 liquid rocket strap-ons. More...
  • Commercial Titan 3 American orbital launch vehicle. Commercial version of Titan 34D military booster. It differed in having a lengthened second stage and a 4 m diameter payload shroud to handle shuttle-class or Ariane-type dual payloads. More...
  • Delta 7925 American orbital launch vehicle. Four stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B More...
  • Delta 7925-9.5 American orbital launch vehicle. Four stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K + 1 x Star 48B with 2.9 m (9.5 foot) diameter fairing) More...
  • Delta 3000 American orbital launch vehicle. The Delta 3000 series upgraded the boosters to Castor 4 solid propellant strap-ons, while retaining the Extended Long Tank core with RS-27 engine. The 3910 series used the TRW Lunar Module engine in the second stage, while the 3920 series reintroduced the Aerojet AJ110 Delta engine. More...

Associated Manufacturers and Agencies
  • ESA European agency overseeing development of rockets and spacecraft. European Space Agency, Europe. More...

Associated Programs
  • Eutelsat EUTELSAT regional geostationary telecommunication satellite for European countries. Operated by the EUTELSAT organization. More...
  • MARECS Geostationary maritime communications satellites, which form part of INMARSAT's world-wide maritime communications satellite network. The program began as the experimental Maritime Orbital Test Satellite (Marots) in 1973, but was subsequently changed to an operational system resulting in a name change, a satellite redesign, and delayed development. Marecs is operated by ESA for Inmarsat. More...
  • NATO Military communications satellite network. More...

Bibliography
  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.
  • Krebs, Gunter, Gunter's Space Page, University of Frankfurt, 1996. Web Address when accessed: here.
  • JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Web Address when accessed: here.
  • Wilson, Andrew, editor,, Jane's/Interavia Space Directory, Jane's Information Group, Coulsdon, Surrey, 1992 et al.
  • Bramscher, Robert G, "A Survey of Launch Vehicle Failures", Spaceflight, 1980, Volume 22, page 351.
  • NASA GSFC Orbital Parameters,
  • National Space Science Center Planetary Page, As of 19 February 1999.. Web Address when accessed: here.
  • NASA/GSFC Orbital Information Group Website, Web Address when accessed: here.
  • Space-Launcher.com, Orbital Report News Agency. Web Address when accessed: here.

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...
  • Kourou After the agreement with newly independent Algeria for France to evacuate their launch sites in that country, a location near Biscarosse was selected for French missile testing. However since only launches westwards across the Bay of Biscay could be made from this site, it was unsuitable for France's Diamant orbital launch vehicle. After reviewing 14 potential sites, a location in the South American French colony of Guiana was selected. This would allow over-water launches to a tremendous range of possible orbital inclinations -- from -100.5 deg to 1.5 deg. Being near the equator, it would provide the maximum assist from the earth's rotation for launches into equatorial orbits. The decision was formalized in April 1964 and in July 1966 ELDO chose the site for future launches of the Europa II launch vehicle. More...
  • Cape Canaveral LC40 Titan launch complex. Constructed as part of the Titan Integrate-Transfer-Launch (ITL) facility at the north end of Cape Canaveral in the early 1960s. Supported a wide variety of military space missions involving Titan IIIC, Titan 34D and Titan IV vehicles. 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...
  • 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...

ECS/OTS Chronology


1977 September 13 - . 23:31 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 3914. LV Configuration: Delta 3914 619/D134. FAILURE: Vehicle exploded, probably SRM case.. Failed Stage: 0.
  • OTS 1 - . Mass: 865 kg (1,906 lb). Nation: Europe. Agency: ESA. Class: Technology. Type: Navigation technology satellite. Spacecraft: ECS/OTS. Decay Date: 1977-09-13 . COSPAR: F770913A. Summary: Orbital Test Satellite; failed to orbit..

1978 May 11 - . 22:59 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 3914. LV Configuration: Delta 3914 627/D141.
  • OTS 2 - . Payload: OTS 2. Mass: 865 kg (1,906 lb). Nation: Europe. Agency: ESA. Class: Technology. Type: Navigation technology satellite. Spacecraft: ECS/OTS. Completed Operations Date: 1991-01-02 . USAF Sat Cat: 10855 . COSPAR: 1978-044A. Apogee: 36,128 km (22,448 mi). Perigee: 36,085 km (22,422 mi). Inclination: 13.1000 deg. Period: 1,452.50 min. Orbital Test Satellite; replacement for OTS-A; communications experiments. European Space Agency satellite. Launch time 2259 GMT. Reached definitive position, 10 deg east longitude, on May 24 at 0800 GMT. Launch by US Delta rocket. Positioned in geosynchronous orbit over the Atlantic Ocean at 10 deg E in 1978-1982 over the Atlantic Ocean 5 deg E in 1982-1990 As of 30 August 2001 located at 18.51 deg W drifting at 4.070 deg W per day. As of 2007 Mar 9 located at 39.02E drifting at 4.083W degrees per day.

1981 December 20 - . 01:29 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 1. LV Configuration: Ariane 1 L04.
  • MARECS 1 - . Payload: MARECS A. Mass: 582 kg (1,283 lb). Nation: Europe. Agency: ESA. Program: MARECS. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. Completed Operations Date: 1996-08-20 . USAF Sat Cat: 13010 . COSPAR: 1981-122A. Apogee: 37,858 km (23,523 mi). Perigee: 36,782 km (22,855 mi). Inclination: 10.8000 deg. Period: 1,515.20 min. MARECS-A was a geostationary maritime communications satellite, which formed part of INMARSAT's world-wide maritime communications satellite network. MARECS-A moved to a new position on the geostationary orbit. Old position: 334E. New position: 22.5 E. The Marecs satellites were members of Inmarsat's first generation global maritime communications network. Positioned in geosynchronous orbit at 26 deg W in 1982-1986; 178 deg E in 1986-1991; 20 deg E in 1991-1992; 22 deg E in 1992-1996 As of 1 September 2001 located at 11.08 deg W drifting at 18.839 deg W per day. As of 2007 Mar 9 located at 168.28W drifting at 18.837W degrees per day. Additional Details: here....

1982 September 9 - . 02:12 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 1. LV Configuration: Ariane 1 L5. FAILURE: Stage 3 turbopump.. Failed Stage: 3.
  • MARECS B - . Payload: MARECS B. Nation: Europe. Agency: ESA. Program: MARECS. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. Decay Date: 1982-09-10 . COSPAR: F820909A. Summary: Marecs B intended for maritime communications, planned for lease to Inmarsat; launched with Sirio 2. Geosynch orbit..

1983 June 16 - . 11:59 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 1. LV Configuration: Ariane 1 L6.
  • Eutelsat 1 - . Payload: ECS 1. Mass: 1,050 kg (2,310 lb). Nation: Europe. Agency: Eutelsat. Program: Eutelsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. Completed Operations Date: 1996-12-11 . USAF Sat Cat: 14128 . COSPAR: 1983-058A. Apogee: 36,246 km (22,522 mi). Perigee: 36,123 km (22,445 mi). Inclination: 9.2000 deg. Period: 1,456.50 min. Designator ESA/83/4. Launch time 1159 GMT. Launch agency ESA. Geostationary position 10+/- 0.1 deg E. EUTELSAT 1 is a regional geostationary telecommunication Satellite for European countries. It is operated by the EUTELSAT organization. Frequency plan: 1 36-138 MHz (S-E). 148-149.9 MHz (E-S). 10.7-11.7 GHz (S-E). 14-14.5 GHz (E-S). Positions: Document Positioned in geosynchronous orbit at 10 deg E in 1983; 13 deg E in 1983-1989; 16 deg E in 1989-1991; 25 deg E in 1992-1993; 48E1993-1996; 36 deg E in 1996 As of 31 August 2001 located at 12.27 deg W drifting at 5.043 deg W per day. As of 2007 Mar 9 located at 109.78W drifting at 5.059W degrees per day.

1984 August 4 - . 13:32 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 3. LV Configuration: Ariane 3 V10.
  • Eutelsat 2 - . Payload: ECS 2. Mass: 700 kg (1,540 lb). Nation: Europe. Agency: Eutelsat. Program: Eutelsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. Completed Operations Date: 1993-11-09 . USAF Sat Cat: 15158 . COSPAR: 1984-081A. Apogee: 36,248 km (22,523 mi). Perigee: 36,165 km (22,471 mi). Inclination: 3.0000 deg. Period: 1,457.60 min. Stationed at 7 deg E. Launch time 1333 UT. Geostationary orbit position 10 +/- 0.1; afterwards 7 +/- 0.1 deg E. EUTELSAT 2 is a regional geostationary satellite for European countries. Positioned in geosynchronous orbit at 10 deg E in 1984; 7 deg E in 1984-1990; 2 deg E in 1991; 1 deg E in 1992-1993 As of 5 September 2001 located at 62.27 deg W drifting at 5.317 deg W per day. As of 2007 Mar 9 located at 57.69E drifting at 5.323W degrees per day.
  • Telecom 1A - . Mass: 690 kg (1,520 lb). Nation: France. Agency: France Telecom. Program: Telecom. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. Completed Operations Date: 1992-09-13 . USAF Sat Cat: 15159 . COSPAR: 1984-081B. Apogee: 36,459 km (22,654 mi). Perigee: 36,179 km (22,480 mi). Inclination: 8.5000 deg. Period: 1,463.40 min. Stationed at 8 deg W. Communications satellite. Registration France 1984-2.B (Telecom 1A) 1985-2.B (Telecom 1B). 1988-1-C (Telecom 1C). Positioned in geosynchronous orbit at 8 deg W in 1984-1992 As of 4 September 2001 located at 142.83 deg W drifting at 6.735 deg W per day. As of 2007 Mar 10 located at 11.08W drifting at 6.728W degrees per day.

1984 November 10 - . 01:14 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 3. LV Configuration: Ariane 3 V11.
  • MARECS 2 - . Payload: MARECS B2. Mass: 563 kg (1,241 lb). Nation: Europe. Agency: ESA. Program: MARECS. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 15386 . COSPAR: 1984-114B. Apogee: 37,544 km (23,328 mi). Perigee: 36,556 km (22,714 mi). Inclination: 9.9000 deg. Period: 1,501.10 min. Stationed at 177.5 deg E; maritime communications; leased by Inmarsat. Geostationary position 177.5 deg E. MARECS PAC 1 is a geostationary maritime mobile communication satellite which will form part of the INMARSAT world-wide maritime communication satellite network. 1985 Jul 1. Move to a new position. Old position: 177.5E. New position: 345 deg E. Positioned in geosynchronous orbit at 177 deg E in 1984-1986; 26 deg W in 1986-1990; 55 deg W in 1990-1992; 15 deg W in 1992-1997; 26 deg W in 1997-on. As of 4 September 2001 located at 25.98 deg W drifting at 0.006 deg E per day. As of 2007 Mar 8 located at 105.63W drifting at 15.647W degrees per day.

1985 May 8 - . 01:15 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 3. LV Configuration: Ariane 3 V13.
  • Telecom 1B - . Mass: 690 kg (1,520 lb). Nation: France. Agency: France Telecom. Program: Telecom. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. Completed Operations Date: 1988-01-01 . USAF Sat Cat: 15678 . COSPAR: 1985-035B. Apogee: 35,784 km (22,235 mi). Perigee: 35,764 km (22,222 mi). Inclination: 5.4000 deg. Period: 1,435.50 min. Stationed at 5 deg W; business communications. Communications satellite. Registration France 1984-2.B (Telecom 1A) 1985-2.B (Telecom 1B). 1988-1-C (Telecom 1C). Positioned in geosynchronous orbit at 5 deg W in 1985-1988 As of 3 September 2001 located at 4.82 deg E drifting at 0.111 deg E per day. As of 2007 Mar 9 located at 86.72E drifting at 0.424E degrees per day.

1985 September 12 - . 23:26 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 3. LV Configuration: Ariane 3 V15. FAILURE: Geosynchronous orbit injection failure. Third stage igniter cartridge failure was determined to be the most likely cause.. Failed Stage: 3.
1987 September 16 - . 00:45 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 3. LV Configuration: Ariane 3 V19.
  • Eutelsat I F4 - . Payload: ECS 4. Mass: 1,175 kg (2,590 lb). Nation: Europe. Agency: Eutelsat. Program: Eutelsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 18351 . COSPAR: 1987-078B. Apogee: 35,813 km (22,253 mi). Perigee: 35,760 km (22,220 mi). Inclination: 6.7000 deg. Period: 1,436.10 min. European communications; 10 deg E. Positioned in geosynchronous orbit at 10 deg E in 1987-1988; 13 deg E in 1989-1991; 7 deg E in 1991-1993; 25 deg E in 1993-1999 As of 2 September 2001 located at 33.14 deg E drifting at 0.002 deg E per day. As of 2007 Mar 11 located at 120.92E drifting at 5.702W degrees per day.

1988 July 21 - . 23:12 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA1. LV Family: Ariane. Launch Vehicle: Ariane 3. LV Configuration: Ariane 3 V24.
  • Eutelsat I F5 - . Payload: ECS 5. Mass: 1,185 kg (2,612 lb). Nation: Europe. Agency: Eutelsat. Program: Eutelsat. Class: Communications. Type: Civilian communications satellite. Spacecraft: ECS/OTS. Completed Operations Date: 2000-07-01 . USAF Sat Cat: 19331 . COSPAR: 1988-063B. Apogee: 36,456 km (22,652 mi). Perigee: 36,321 km (22,568 mi). Inclination: 6.1000 deg. Period: 1,466.90 min. European communications; 13 deg E. ECS-5/Eutelsat I F5 is a regional geostationary telecommunications satellite for European countries. It is operated by the EUTELSAT organization. Frequency plan 136-138 MHz (S-E), 148-149.9 MHz (E-S), 10.7-11.7 GHz (S-E), 14.0-14.5 GHz (E-S). Launch time 2334:00 UT. ESA designator ESA/88/03. Positioned in geosynchronous orbit at 10 deg E in 1989-1991; 21 deg E in 1991-1998; 12 deg W in 1998-1999 As of 4 September 2001 located at 48.15 deg E drifting at 7.596 deg W per day. As of 2007 Mar 9 located at 102.26W drifting at 7.597W degrees per day.

1988 December 11 - . 00:33 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA2. LV Family: Ariane. Launch Vehicle: Ariane 44LP. LV Configuration: Ariane 44LP V27.
  • Skynet 4B - . Mass: 1,433 kg (3,159 lb). Nation: UK. Agency: MoD. Program: Skynet. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. Completed Operations Date: 1988-06-16 . USAF Sat Cat: 19687 . COSPAR: 1988-109A. Apogee: 35,967 km (22,348 mi). Perigee: 35,933 km (22,327 mi). Inclination: 7.5000 deg. Period: 1,444.40 min. British military communications; 1 deg W. Military communications. Positioned in geosynchronous orbit at 1 deg W in 1989-1990; 53 deg E in 1990-1998 As of 4 September 2001 located at 60.05 deg E drifting at 2.136 deg W per day. As of 2007 Mar 10 located at 126.32E drifting at 2.116W degrees per day.

1990 January 1 - . 00:07 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC40. LV Family: Titan. Launch Vehicle: Commercial Titan 3. LV Configuration: Commercial Titan 3 CT-1.
  • Skynet 4A - . Payload: Skynet 4A [PAM-D2] / JCSat 2 [Orbus-7S]. Mass: 1,463 kg (3,225 lb). Nation: UK. Agency: MoD. Program: Skynet. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 20401 . COSPAR: 1990-001A. Apogee: 35,790 km (22,230 mi). Perigee: 35,782 km (22,233 mi). Inclination: 5.5000 deg. Period: 1,436.10 min. British military communications; 6 deg E. Military communications. Expected life approx 7 years. Owner/operator: Ministry of Defence, Main Building, Whitehall, London SW1A 2HB. Positioned in geosynchronous orbit at 6 deg E in 1990; 29 deg E in 1991; 65 deg E in 1991; 34 deg W in 1992-1999 As of 5 September 2001 located at 34.01 deg W drifting at 0.003 deg W per day. As of 2007 Mar 11 located at 63.46W drifting at 4.595W degrees per day.

1990 August 30 - . 22:46 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA2. LV Family: Ariane. Launch Vehicle: Ariane 44LP. LV Configuration: Ariane 44LP V38.
  • Skynet 4C - . Mass: 1,463 kg (3,225 lb). Nation: UK. Agency: MoD. Program: Skynet. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 20776 . COSPAR: 1990-079A. Apogee: 35,793 km (22,240 mi). Perigee: 35,781 km (22,233 mi). Inclination: 2.0000 deg. Period: 1,436.10 min. UK military communications; 1 deg W. United Kingdom military communications satellite. Owner/operator: UK Ministry of Defence. Expected operational life 10 years. Positioned in geosynchronous orbit at 1 deg W in 1990-1999 As of 3 September 2001 located at 0.97 deg W drifting at 0.002 deg E per day. As of 2007 Mar 10 located at 1.27W drifting at 0.000W degrees per day.

1991 January 8 - . 00:53 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17B. LV Family: Delta. Launch Vehicle: Delta 7925. LV Configuration: Delta 7925 D202.
  • NATO 4A - . Payload: NATO 4A. Mass: 1,433 kg (3,159 lb). Nation: NATO. Agency: NATO. Program: NATO. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 21047 . COSPAR: 1991-001A. Apogee: 35,800 km (22,200 mi). Perigee: 35,775 km (22,229 mi). Inclination: 2.6000 deg. Period: 1,436.10 min. NATO communications; 18 deg W. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit at 18 deg W in 1991-1999 As of 5 September 2001 located at 17.81 deg W drifting at 0.007 deg W per day. As of 2007 Mar 10 located at 16.26W drifting at 0.003W degrees per day.

1993 December 8 - . 00:48 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17A. LV Family: Delta. Launch Vehicle: Delta 7925. LV Configuration: Delta 7925 D224.
  • USA 98 - . Payload: NATO 4B. Mass: 1,430 kg (3,150 lb). Nation: NATO. Agency: NATO. Program: NATO. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 22921 . COSPAR: 1993-076A. Apogee: 35,805 km (22,248 mi). Perigee: 35,767 km (22,224 mi). Inclination: 2.2000 deg. Period: 1,436.10 min. NATO encrypted communications relay. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit at 6 deg E in 1994-1998; 20 deg W in 1998-1999 As of 2 September 2001 located at 20.16 deg W drifting at 0.009 deg W per day. As of 2007 Mar 10 located at 35.47E drifting at 0.007E degrees per day.

1998 January 10 - . 00:32 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC17B. LV Family: Delta. Launch Vehicle: Delta 7925-9.5. LV Configuration: Delta 7925-9.5 D252.
  • Skynet 4D - . Nation: UK. Agency: MoD. Manufacturer: Martin. Program: Skynet. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 25134 . COSPAR: 1998-002A. Apogee: 35,795 km (22,241 mi). Perigee: 35,776 km (22,230 mi). Inclination: 3.9000 deg. Period: 1,436.00 min. Summary: Geostationary at 52.8 degrees E. Positioned in geosynchronous orbit at 53 deg E in 1998-1999; moving As of 4 September 2001 located at 34.00 deg W drifting at 0.004 deg W per day. As of 2007 Mar 10 located at 34.33W drifting at 0.016W degrees per day..

1999 February 26 - . 22:44 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA2. LV Family: Ariane. Launch Vehicle: Ariane 44L. LV Configuration: Ariane 44L V116.
  • Skynet 4E - . Mass: 1,490 kg (3,280 lb). Nation: UK. Agency: MoD. Manufacturer: Stevenage. Program: Skynet. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 25639 . COSPAR: 1999-009B. Apogee: 35,796 km (22,242 mi). Perigee: 35,777 km (22,230 mi). Inclination: 7.2000 deg. Period: 1,436.10 min. Skynet 4E was a SHF/UHF military communications satellite for the UK Ministry of Defense. Dry mass was 759 kg; it used a Thiokol Star 30 solid apogee motor. Stationed at 53 deg E. Positioned in geosynchronous orbit at 53 deg E in 1999. As of 5 September 2001 located at 52.91 deg E drifting at 0.000 deg W per day. As of 2007 Mar 11 located at 53.02E drifting at 0.005E degrees per day.

2001 February 7 - . 23:05 GMT - . Launch Site: Kourou. Launch Complex: Kourou ELA2. LV Family: Ariane. Launch Vehicle: Ariane 44L. LV Configuration: Ariane 44L-3 V139.
  • Skynet 4F - . Mass: 2,596 kg (5,723 lb). Nation: UK. Agency: MoD. Manufacturer: Alenia. Program: Skynet. Class: Communications. Type: Military communications satellite. Spacecraft: ECS/OTS. USAF Sat Cat: 26695 . COSPAR: 2001-005B. Apogee: 35,801 km (22,245 mi). Perigee: 35,772 km (22,227 mi). Inclination: 2.9000 deg. Period: 1,436.10 min. Skynet 4F was a communications satellite for the UK Ministry of Defense, and the last of the venerable ECS (European Communications Satellite) class of satellites built by Astrium/Stevenage. It carried a Thiokol Star 30 apogee motor and its mass was 1489 kg full, 830 kg dry - a dry mass more than twice the first OTS. The spacecraft carried a total of eight transponders in the SHF-, UHF-, and S-bands to provide secure communications after parking over either 1 deg-E or 6 deg-W. Positioned in geosynchronous orbit at 6 deg E in 2001 As of 5 September 2001 located at 8.77 deg E drifting at 0.284 deg W per day. As of 2007 Mar 10 located at 6.01E drifting at 0.004E degrees per day.

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