description Delta J Overview
The Delta J was an expendable launch system in the Delta rocket family, utilized by the United States in the late 1960s. It was derived from the earlier Delta E rocket but featured an upgraded third stage powered by a Star 37 solid rocket motor. This specific modification significantly increased the vehicle's payload capacity for geosynchronous transfer orbits. The rocket was developed to launch medium-sized scientific and communications satellites for NASA and other organizations.
help Delta J FAQ
What was the Delta J rocket?
The Delta J, also called Thor-Delta J, was a U.S. expendable launch system in the Delta rocket family. It was derived from the Delta E and was designed for a higher-energy upper-stage mission. [Delta J launch history](https://spacestatsonline.com/rockets/delta-j/)
What did the only Delta J launch carry?
The Delta J launched the Explorer 38 radio astronomy satellite, also known as Radio Astronomy Explorer A. It lifted off from Vandenberg Air Force Base's Space Launch Complex 2E on 4 July 1968 and reached orbit successfully. [Delta J history](https://en.wikipedia.org/wiki/Delta_J)
How did Delta J differ from Delta E?
Its main change was the third stage. Delta J replaced the Delta E's Altair stage with the more powerful Star 37D solid rocket motor. [Delta J history](https://en.wikipedia.org/wiki/Delta_J)
How many times did Delta J fly?
Delta J flew only once, in 1968, and that mission was successful. Its single launch carried Explorer 38 into medium Earth orbit. [Delta J launch history](https://spacestatsonline.com/rockets/delta-j/)
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