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{{Infobox spaceflight
{{Infobox spaceflight
| name = Intelsat III F-1
| name = Intelsat III F-1
| image =
| image =
| image_alt =
| image_caption =
| image_caption =


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| operator = [[Intelsat]]
| operator = [[Intelsat]]
| website =
| website =
| COSPAR_ID = INT3F-1
| mission_duration = 5&nbsp;years planned<br/>Failed to orbit
| mission_duration = 5&nbsp;years planned<br/>Failed to orbit


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| power = 183&nbsp;watts
| power = 183&nbsp;watts


| launch_date = {{start-date|September 19, 1968, 00:09:00|timezone=yes}}&nbsp;UTC<ref name="launchlog">{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|first=Jonathan|last=McDowell|work=Jonathan's Space Page|accessdate=February 9, 2014}}</ref>
| launch_date = {{start-date|September 19, 1968, 00:09:00|timezone=yes}}&nbsp;UTC<ref name="launchlog">{{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|first=Jonathan|last=McDowell|work=Jonathan's Space Page|access-date=February 9, 2014}}</ref>
| launch_rocket = [[Delta M]]
| launch_rocket = [[Delta M]]
| launch_site = [[Cape Canaveral Air Force Station|Cape Canaveral]] [[Cape Canaveral Air Force Station Space Launch Complex 17|LC-17A]]
| launch_site = [[Cape Canaveral Air Force Station|Cape Canaveral]] [[Cape Canaveral Air Force Station Space Launch Complex 17|LC-17A]]
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| programme = ''Intelsat III''
| programme = ''Intelsat III''
| previous_mission = ''None''
| previous_mission = [[Intelsat II F-4]] ([[Intelsat II]])
| next_mission = [[Intelsat III F-1]]
| next_mission = [[Intelsat III F-2]]
}}
}}


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==Design==
==Design==
[[Image:Delta-M launching Intelsat-3 satellite.jpg|thumb|left|190px|Launch of Intelsat III F-1.]]
The first of eight [[Intelsat III]] satellites to be launched, Intelsat III F-1 was built by [[TRW Inc.|TRW]]. It was a {{convert|293|kg|lb|adj=on}} spacecraft equipped with two [[transponder]]s to be powered by body-mounted solar cells generating 183&nbsp;watts of power.<ref name="EA">{{cite web|url=http://www.astronautix.com/craft/intlsat3.htm|title=Intelsat 3|first=Mark|last=Wade|work=Encyclopedia Astronautica|accessdate=February 9, 2014}}</ref> It had a design life of five years and carried an [[SVM-2]] [[apogee motor]] for propulsion..<ref name="gsp">{{cite web|url=http://space.skyrocket.de/doc_sdat/intelsat-3.htm|title=Intelsat-3|first=Gunter|last=Krebs|work=Gunter's Space Page|accessdate=February 9, 2014}}</ref>
The first of eight [[Intelsat III]] satellites to be launched, Intelsat III F-1 was built by [[TRW Inc.|TRW]]. It was a {{convert|293|kg|lb|adj=on}} spacecraft equipped with two [[transponder]]s to be powered by body-mounted solar cells generating 183&nbsp;watts of power.<ref name="EA">{{cite encyclopedia|url=http://www.astronautix.com/craft/intlsat3.htm|archive-url=https://web.archive.org/web/20020223094128/http://www.astronautix.com/craft/intlsat3.htm|url-status=dead|archive-date=February 23, 2002|title=Intelsat 3|first=Mark|last=Wade|encyclopedia=Encyclopedia Astronautica|access-date=February 9, 2014}}</ref> It had a design life of five years and carried an [[SVM-2]] [[apogee motor]] for propulsion.<ref name="gsp">{{cite web|url=http://space.skyrocket.de/doc_sdat/intelsat-3.htm|title=Intelsat-3|first=Gunter|last=Krebs|work=Gunter's Space Page|access-date=February 9, 2014}}</ref>


==Launch==
==Launch==
Intelsat III F-1 was launched on the maiden flight of the [[Delta M]] rocket, flying from [[Cape Canaveral Air Force Station Space Launch Complex 17|Launch Complex 17A]] at the [[Cape Canaveral Air Force Station]]. The launch took place at 00:09:00 UTC on September 19, 1968, with the spacecraft bound for a [[geosynchronous transfer orbit]].<ref name="launchlog"/>
Intelsat III F-1 was launched on the maiden flight of the [[Delta M]] rocket, flying from [[Cape Canaveral Air Force Station Space Launch Complex 17|Launch Complex 17A]] at the [[Cape Canaveral Air Force Station]]. The launch took place at 00:09:00 UTC on September 19, 1968, with the spacecraft bound for a [[geosynchronous transfer orbit]].<ref name="launchlog"/>


It was to go in operation above the [[Atlantic Ocean]] in time to relay broadcasts of the next month's [[1968 Summer Olympics|Olympics]] in {{nowrap|[[Mexico City]]}}.<ref name=rexpalu>{{cite news|url=https://news.google.com/newspapers?id=Mt0yAAAAIBAJ&sjid=oVoDAAAAIBAJ&pg=7221%2C5379790 |work=St. Petersburg Times |location=(Florida) |agency=UPI |title=Rocket explodes after launch; new satellite lost |date=September 19, 1968 |page=11A}}</ref><ref name=bleorb>{{cite news|url=https://news.google.com/newspapers?id=F7dWAAAAIBAJ&sjid=bekDAAAAIBAJ&pg=4813%2C669578 |work=Spokesman-Review |location=(Spokane, Washington) |agency=Associated Press |title=Blast ends orbit try for satellite |date=September 19, 1968 |page=1}}</ref><ref name=blwnp>{{cite news |url=https://news.google.com/newspapers?id=Mt0yAAAAIBAJ&sjid=oVoDAAAAIBAJ&pg=7221%2C5379790|title=Rocket explodes after launch; new satellite lost|publisher=The St. Petersburg Times (Florida)|agency=UPI |date=September 19, 1968|page=11A}}</ref>
⚫
Twenty seconds after liftoff a fault became apparent in the gyroscope used to monitor the rate at which the rocket [[pitch (aeronautics)|pitched]] over. Control of the rocket was subsequently lost, with it beginning to disintegrate around 102 seconds into the flight.<ref>{{cite web|url=http://www.spacelaunchreport.com/thorh9.html|title=Long Tank Thor-Delta|first=Ed|last=Kyle|work=Space Launch Report|accessdate=February 9, 2014}}</ref> At 108 seconds after launch the rocket was destroyed by [[range safety]].<ref>{{cite web|url=http://www.spacelaunchreport.com/thrfail.txt|title=Thor-Based Space Launch History|first=Ed|last=Kyle|work=Space Launch Report|accessdate=February 9, 2014}}</ref>

⚫
Twenty seconds after liftoff a fault became apparent in the gyroscope used to monitor the rate at which the rocket [[pitch (aeronautics)|pitched]] over. Control of the rocket was subsequently lost, with it beginning to disintegrate around 102 seconds into the flight.<ref>{{cite web|url=http://www.spacelaunchreport.com/thorh9.html|title=Long Tank Thor-Delta|first=Ed|last=Kyle|work=Space Launch Report|access-date=February 9, 2014}}</ref> At 108 seconds after launch the rocket was destroyed by [[range safety]].<ref>{{cite web|url=http://www.spacelaunchreport.com/thrfail.txt|title=Thor-Based Space Launch History|first=Ed|last=Kyle|work=Space Launch Report|access-date=February 9, 2014}}</ref>


{{Clear}}
{{Clear}}
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[[Category:Spacecraft launched in 1968]]
[[Category:Spacecraft launched in 1968]]
[[Category:Satellite launch failures]]
[[Category:Satellite launch failures]]



{{US-spacecraft-stub}}
{{US-spacecraft-stub}}

Latest revision as of 16:37, 16 April 2023

Intelsat III F-1
Mission typeCommunications
OperatorIntelsat
COSPAR IDINT3F-1
Mission duration5 years planned
Failed to orbit
Spacecraft properties
Spacecraft typeIntelsat III
ManufacturerTRW
Launch mass293 kilograms (646 lb)
Power183 watts
Start of mission
Launch dateSeptember 19, 1968, 00:09:00 (1968-09-19UTC00:09Z) UTC[1]
RocketDelta M
Launch siteCape Canaveral LC-17A
ContractorNASA
Orbital parameters
Reference systemGeocentric
RegimeGeosynchronous
EpochPlanned
Intelsat III

Intelsat III F-1 was a communications satellite intended to be operated by Intelsat. Launched towards geostationary orbit in 1968 it failed to achieve orbit.

Design

[edit]
Launch of Intelsat III F-1.

The first of eight Intelsat III satellites to be launched, Intelsat III F-1 was built by TRW. It was a 293-kilogram (646 lb) spacecraft equipped with two transponders to be powered by body-mounted solar cells generating 183 watts of power.[2] It had a design life of five years and carried an SVM-2 apogee motor for propulsion.[3]

Launch

[edit]

Intelsat III F-1 was launched on the maiden flight of the Delta M rocket, flying from Launch Complex 17A at the Cape Canaveral Air Force Station. The launch took place at 00:09:00 UTC on September 19, 1968, with the spacecraft bound for a geosynchronous transfer orbit.[1]

It was to go in operation above the Atlantic Ocean in time to relay broadcasts of the next month's Olympics in Mexico City.[4][5][6]

Twenty seconds after liftoff a fault became apparent in the gyroscope used to monitor the rate at which the rocket pitched over. Control of the rocket was subsequently lost, with it beginning to disintegrate around 102 seconds into the flight.[7] At 108 seconds after launch the rocket was destroyed by range safety.[8]

See also

[edit]

References

[edit]
  1. ^ a b McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved February 9, 2014.
  2. ^ Wade, Mark. "Intelsat 3". Encyclopedia Astronautica. Archived from the original on February 23, 2002. Retrieved February 9, 2014.
  3. ^ Krebs, Gunter. "Intelsat-3". Gunter's Space Page. Retrieved February 9, 2014.
  4. ^ "Rocket explodes after launch; new satellite lost". St. Petersburg Times. (Florida). UPI. September 19, 1968. p. 11A.
  5. ^ "Blast ends orbit try for satellite". Spokesman-Review. (Spokane, Washington). Associated Press. September 19, 1968. p. 1.
  6. ^ "Rocket explodes after launch; new satellite lost". The St. Petersburg Times (Florida). UPI. September 19, 1968. p. 11A.
  7. ^ Kyle, Ed. "Long Tank Thor-Delta". Space Launch Report. Retrieved February 9, 2014.
  8. ^ Kyle, Ed. "Thor-Based Space Launch History". Space Launch Report. Retrieved February 9, 2014.


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