Delta D

Delta D
	Launch of a Delta D with Intelsat I
Function	Expendable launch system
Country of origin	United States
Launch history
Status	Retired
Launch sites	Cape Canaveral LC-17
Total launches	2
Success(es)	2
First flight	19 August 1964
Last flight	6 April 1965

The Delta D, Thrust Augmented Delta or Thor-Delta D was an American expendable launch system used to launch two communications satellites in 1964 and 1965. It was derived from the Delta C, and was a member of the Delta family of rockets.

The three-stage core vehicle was essentially the same as the Delta C. The first stage was a Thor missile in the DSV-2A configuration, and the second stage was the Delta D, which was derived from the earlier Delta. An Altair-2 SRM was used as a third stage. The main difference between the Delta C and Delta D was the presence of three Castor-1 solid rocket boosters, clustered around the first stage.

Both Delta D launches were conducted from Cape Canaveral Air Force Station Launch Complex 17A. The first, on 19 August 1964, carried Syncom 3, the first satellite in a geostationary orbit. The last, on 6 April 1965, carried the first commercial communications satellite, Intelsat I.

References

Wade, Mark. "Delta". Encyclopedia Astronautica. Archived from the original on 2008-07-24. Retrieved 2009-02-09.
Krebs, Gunter. "Thor family". Gunter's Space Page. Retrieved 2009-02-09.

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Orbital launch systems
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In development	Amur Angara 1.2 Ariane 6 Bloostar Cyclone-4M Eris Firefly Alpha Beta H3 Hyperbola-2 Irtysh Kuaizhou 21 31 Long March 921 rocket 9 Miura 5 New Glenn New Line 1 Nuri OS-M2 OS-M4 Orbex Prime SLS Soyuz-7 SSLV Starship Terran 1 Vega C Vega E Vulcan Zero Zhuque-2
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Classes	Sounding rocket Small-lift launch vehicle Medium-lift launch vehicle Heavy-lift launch vehicle Super heavy-lift launch vehicle
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Orbital launch systems developed in the United States
Active	Antares 230+ Atlas V Delta IV Heavy Falcon 9 Block 5 Falcon Heavy LauncherOne Minotaur I IV V C Pegasus Rocket 3
In development	Firefly Alpha Beta New Glenn SLS Starship Terran 1 Vulcan
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* - Japanese projects using US rockets or stages ** - uses Russian engines