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From Wikipedia, the free encyclopedia

Delta D
Delta D Intelsat1.jpg
Launch of a Delta D with Intelsat I
FunctionExpendable launch system
Country of originUnited States
Launch history
Launch sitesCape Canaveral LC-17
Total launches2
First flight19 August 1964
Last flight6 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.


  • 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.

This page was last edited on 19 January 2021, at 20:08
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