Intelsat 604

{{Short description|Geostationary communications satellite}}

{{coord|0|-55|display=title}}

{{Infobox spaceflight

| name = Intelsat 604

| image =

| image_caption =

| mission_type = Communication

| operator = Intelsat

| website =

| COSPAR_ID = 1990-056A{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1990-056A|title=INTELSAT 6 F-4|publisher=US National Space Science Data Center|access-date=13 July 2012}}

| SATCAT = 20667

| mission_duration = 13 years (planned)
16 years (achieved)

| spacecraft_bus = HS-389

| manufacturer = Hughes

| dry_mass =

| launch_mass = {{convert|4215|kg}}

| power =

| launch_date = {{start-date|23 June 1990, 11:19|timezone=yes}} UTC

| launch_rocket = CT-III/Orbus-21S CT-3

| launch_site = Cape Canaveral LC-40

| launch_contractor = Martin Marietta

| entered_service =

| disposal_type = Decommissioned

| deactivated = {{end-date|6 April 2006}}

| orbit_epoch = 26 July 1990

| orbit_reference = Geocentric

| orbit_regime = Geostationary

| orbit_periapsis = {{convert|35692|km}}

| orbit_apoapsis = {{convert|35887|km}}

| orbit_inclination = 0.3 degrees

| orbit_period = 1436.24 minutes

| orbit_longitude =

| apsis = gee

| trans_band =

| trans_frequency =

| trans_capacity =

| trans_coverage =

| trans_TWTA =

| trans_EIRP =

| trans_HPBW =

| programme = Intelsat VI

| previous_mission = Intelsat VI F-3

| next_mission = Intelsat VI F-5

}}

Intelsat 604, previously named Intelsat VI F-4, was a communications satellite operated by Intelsat. Launched in 1990, it was the third of five Intelsat VI satellites to be launched. The Intelsat VI series was constructed by Hughes Aircraft, based on the HS-389 satellite bus.

Intelsat 604 was launched at 11:19 UTC on 23 June 1990, atop a Commercial Titan III carrier rocket, flight number CT-3, with an Orbus-21S upper stage.{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|publisher=Jonathan's Space Page|first=Jonathan|last=McDowell|author-link=Jonathan McDowell|access-date=13 July 2012}} The launch took place from Launch Complex 40 at Cape Canaveral Air Force Station,{{cite web|url=http://planet4589.org/space/lvdb/list2.html|title=Launch List|publisher=Jonathan's Space Page|work=Launch Vehicle Database|first=Jonathan|last=McDowell|access-date=13 July 2012|archive-date=15 August 2020|archive-url=https://web.archive.org/web/20200815040340/http://planet4589.org/space/lvdb/list2.html|url-status=dead}} and successfully placed Intelsat 604 into a geosynchronous transfer orbit. The satellite raised itself into its final geostationary orbit using two liquid-fuelled R-4D-12 engines,{{cite web|url=http://space.skyrocket.de/doc_sdat/intelsat-6.htm|title=Intelsat-6 (601, 602, 603, 604, 605)|first=Gunter|last=Krebs|work=Gunter's Space Page|access-date=13 July 2012}} with the satellite arriving in geostationary orbit on 28 June 1990.{{cite web|url=http://planet4589.org/space/log/geo.date|title=Index|publisher=Jonathan's Space Page|work=Geostationary Orbit Catalog|first=Jonathan|last=McDowell|access-date=13 July 2012|archive-url=https://web.archive.org/web/20100406015538/http://www.planet4589.org/space/log/geo.date|archive-date=6 April 2010|url-status=dead}}

Intelsat 604 initially operated in a geostationary orbit with a perigee of {{convert|35692|km}}, an apogee of {{convert|35887|km}}, and 0.3 degrees of inclination,{{cite web|url=http://planet4589.org/space/log/satcat.txt|title=Satellite Catalog|publisher=Jonathan's Space Page|first=Jonathan|last=McDowell|access-date=13 July 2012}} however over time this became more inclined. 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 {{convert|4215|kg}}.

Following its arrival in geostationary orbit, Intelsat 604 was deployed at a longitude of 38 degrees west. It was moved to 27.5 degrees west in January 1991, where it operated until February 1992. From October 1992 to March 2002, it was operated at 60 degrees east. After leaving this position, it was positioned at 157 degrees east from August 2002 to September 2005. Its final deployment was from February to March 2006, at 177.85 degrees. The satellite was decommissioned on 6 April 2006 after it had been moved to a graveyard orbit.{{cite encyclopedia|url=http://www.tbs-satellite.com/tse/online/sat_intelsat_604.html|title=Intelsat 604|publisher=tbs Internet|encyclopedia=The Satellite Encyclopedia|date=3 July 2012|access-date=13 July 2012}}