Intelsat 603

Intelsat 603

Intelsat 603
Astronauts working on Intelsat 603 during STS-49
Mission type Communication
Operator Intelsat
COSPAR ID 1990-021A[1]
SATCAT № 20523[1]
Mission duration 13 years (planned)
Spacecraft properties
Bus HS-389
Manufacturer Hughes[2]
Launch mass 4,215 kilograms (9,292 lb)[2]
Start of mission
Launch date 14 March 1990, 11:52:31 (1990-03-14T11:52:31Z) UTC
Rocket CT-III/Orbus-21S CT-2[3]
Launch site Cape Canaveral LC-40[3]
Contractor Martin Marietta
End of mission
Disposal Decommissioned
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Orbital parameters
Reference system Geocentric
Regime Geostationary
Perigee 35,776 kilometres (22,230 mi)[4]
Apogee 35,797 kilometres (22,243 mi)[4]
Inclination 0.3 degrees[4]
Period 1436.09 minutes[4]

Intelsat 603 or IS-603, previously named Intelsat VI F-3, is a communications satellite operated by Intelsat. Launched in 1990, it was the second of five Intelsat VI satellites to be launched. The Intelsat VI series was constructed by Hughes Aircraft, based around the HS-389 satellite bus.[2]


Intelsat 603 was launched at 11:52:31 UTC on 14 March 1990, atop a Commercial Titan III carrier rocket, flight number CT-2, with an Orbus-21S upper stage.[2][3] The launch took place from Launch Complex 40 at the Cape Canaveral Air Force Station,[5] and was intended to place Intelsat 603 into a geosynchronous transfer orbit. The Orbus-21S failed to separate from the Titan's second stage, and as a result it was unable to fire, leaving Intelsat 603 in low Earth orbit.

Following the launch failure, Intelsat commissioned NASA to launch a replacement perigee motor to raise the satellite's orbit. During its maiden flight, STS-49, in 1992 Space Shuttle Endeavour rendezvoused with and captured Intelsat 603, and astronauts attached a new Orbus-21S to the satellite.[6] This motor successfully raised the satellite into the planned transfer orbit.

The satellite raised itself into its final geostationary orbit using two liquid-fuelled R-4D-12 engines,[2] with the satellite arriving in geostationary orbit on 21 May 1992.[7]


Intelsat 603 operated in a geostationary orbit with a perigee of 35,776 kilometres (22,230 mi), an apogee of 35,797 kilometres (22,243 mi), and 0.3 degrees of inclination.[4] The satellite carried 38 IEEE C band and ten IEEE Ku band transponders, and had a design life of 13 years and a mass of 4,215 kilograms (9,292 lb).[2]

Upon arrival in geostationary orbit, Intelsat 603 was placed at a longitude of 34.5 degrees west. It remained there until October 1997, when it was moved to 24.5 degrees west, arriving in November. In August 2002 it was relocated to 19.95 degrees west, where it operated until March 2010. Finally from May 2010 it operated at 11.5 degrees east until it was removed from geostationary orbit in Jan 2013.[8]


  1. ^ a b "INTELSAT 6 F-3". US National Space Science Data Center. Retrieved 13 July 2012. 
  2. ^ a b c d e f Krebs, Gunter. "Intelsat-6 (601, 602, 603, 604, 605)". Gunter's Space Page. Retrieved 13 July 2012. 
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 13 July 2012. 
  4. ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 13 July 2012. 
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 13 July 2012. 
  6. ^ "STS-49 PRESS KIT". National Aeronautics and Space Administration. May 1992. Retrieved 13 July 2012. 
  7. ^ McDowell, Jonathan. "Index". Geostationary Orbit Catalog. Jonathan's Space Page. Retrieved 13 July 2012. 
  8. ^ "Intelsat 603". The Satellite Encyclopedia. tbs Internet. 7 May 2013. Retrieved 7 May 2013.