Delta 4000
Launch of a Delta 4925 | |
Function | Expendable launch system |
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Country of origin |
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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.
References
- Wade, Mark. "Delta". Encyclopedia Astronautica. Retrieved 2009-02-15.
- Krebs, Gunter. "Thor family". Gunter's Space Page. Retrieved 2009-02-15.