Delta B

	Delta B prior to the launch of TIROS-8
Has use	Expendable launch system
Country of origin	United States
Size
Stages	Thor DM-21; AJ10; Altair ;
Launch history
Status	Retired
Launch sites	Cape Canaveral LC-17
Total launches	9
Success(es)	8
Failure(s)	1
First flight	13 December 1962
Last flight	19 March 1964

The Delta B, or Thor-Delta B was an American expendable launch system used for nine orbital launches between 1962 and 1964. A derivative of the Thor-Delta, it was a member of the Delta family of rockets.

The first stage was a Thor missile in the DM-21 configuration, and the second stage was the AJ10-118, which was derived from the earlier Delta-A. An Altair solid rocket motor was used as a third stage.

All nine launches occurred from Cape Canaveral Air Force Station Launch Complex 17. Most of the launches carried communications satellites, including Syncom-1 and Syncom-2. Syncom-1 was intended to be the first satellite to be placed into a geosynchronous orbit, however the spacecraft malfunctioned prior to reaching this orbit. Syncom-2 subsequently became the first geosynchronous satellite, and was placed at 55° west of the Greenwich Meridian. The final launch failed due to third stage underperformance, all other launches were successful.

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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v t Orbital launch systems developed in the United States
Active	Antares 230+ Atlas V Delta IV Heavy Falcon 9 Block 5 Falcon Heavy Firefly Alpha LauncherOne Minotaur I IV V C Pegasus XL Astra Rocket 3
In development	Firefly Beta New Glenn Red Dwarf RS1 SLS Block 1 Block 1B Block 2 Starship Terran 1 R Vulcan
Retired	Antares 110/120/130/230 Athena I II Atlas B D E/F G H I II III LV-3B SLV-3 Able Agena Centaur Conestoga Delta A B C D E G J L M N 0100 1000 2000 3000 4000 5000 II III IV Falcon 1 Falcon 9 v1.0 v1.1 v1.2 "Full Thrust" H-I* Juno I Juno II N-I* N-II* Pilot Saturn I IB V Scout Space Shuttle SPARK Sparta Thor Able Ablestar Agena Burner Delta DSV-2U Thorad-Agena Titan II GLV IIIA IIIB IIIC IIID IIIE 34D 23G CT-3 IV Vanguard
* - Japanese projects using US rockets or stages ** - uses Russian engines