Delta 4000

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Delta 4000 series
Delta 4925.jpg
Launch of a Delta 4925
Function Expendable launch system
Country of origin  United States
Launch history
Status Retired
Launch sites Canaveral LC-17B
Total launches 2
Successes 2
First flight 28 August 1989
Last flight 12 June 1990

The Delta 4000 series was an American expendable launch system which was used to conduct two orbital launches in 1989 and 1990. It was a member of the Delta family of rockets. Although several variants were put forward, only the Delta 4925 was launched. The designations used a four digit numerical code to store information on the configuration of the rocket. It was built from a combination of spare parts left over from earlier Delta rockets, which were being retired, and parts from the Delta II 6000-series, which was just entering service.

The first stage was the MB-3-III powered Extended Long Tank Thor, previously flown on the 1000-series. Nine Castor-4A solid rocket boosters were attached to increase thrust at lift-off, replacing the less powerful Castor-4 boosters used on the 3000 series. The Delta-K was used as a second stage. A Star-48B PAM-D was used as a third stage, to boost payloads into geosynchronous transfer orbit.

Both Delta 4000 launches occurred from Launch Complex 17B at Cape Canaveral. The first launched Marco Polo 1 for BSkyB, and the second launched INSAT 1D for the Indian Space Research Organisation. Both were successful.


  • Wade, Mark. "Delta". Encyclopedia Astronautica. Retrieved 2009-02-15.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  • Krebs, Gunter. "Thor family". Gunter's Space Page. Retrieved 2009-02-15.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>