List of Delta DM-19 launches

Short description: None

List of Delta DM-19 launches

Thor-Delta prior to the launch of Explorer 10

Function| Expendable launch system
Country of origin| United States
Launch history
Status| Retired
Launch sites| Cape Canaveral LC-17
Total launches| 12
Successes| 11
Failures| 1
First flight| 1960-05-13
Last flight| 1962-09-18

## Contents

* 1 About the Delta DM-19
* 2 Launch statistics
* 2.1 Launch outcome
* 2.2 Launchpad
* 2.3 Orbit
* 2.4 Function
* 3 Launch history
* 4 See also
* 5 References

## About the Delta DM-19

The Thor-Delta, also known as Delta DM-19 or just Delta was an early American expendable launch system used for 12 orbital launches in the early 1960s. A derivative of the Thor-Able, it was a member of the Thor family of rockets, and the first member of the Delta family.[1]

The first stage was a Thor missile in the DM-19 configuration. The second stage was the Delta, which had been derived from the earlier Able stage. An Altair solid rocket motor was used as a third stage.[2]

The basic design of the original Vanguard upper stages, featuring a pressure-fed nitric acid/UDMH, regeneratively cooled engine, was kept in place, but with an improved AJ10-118 engine. More significantly, the Delta stage featured cold gas attitude control jets allowing it to be stabilized in orbit for restart and more precise burns.

The Thor-Delta was the first rocket to use the combination of a Thor missile and a Delta upper stage. This configuration was reused for many later rockets, and a derivative, the Delta II, remained in service until 2018.

The Thor-Delta launched a number of significant payloads, including the first communications satellite, Echo 1A; the first British satellite, Ariel 1; and the first active direct-relay communications satellite, Telstar 1. All 12 launches occurred from Cape Canaveral Air Force Station Launch Complex 17. The launch of Telstar 1 used pad B, while all other launches were from pad A. All launches were successful except the maiden flight, which failed to place Echo 1 into orbit due to a problem with the second stage.

## Launch statistics

### Launch outcome

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### Launchpad

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### Orbit

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### Function

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## Launch history

Date/time
(UTC)  | Rocket  | S/N | Launch site  | Payload  | Function  | Orbit  | Outcome  | Remarks

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1960-05-13
09:16:05  | Thor DM-19 Delta | Thor 144
Delta 1  | CCAFS LC-17A  | Echo 1  | Communication  | MEO | Failure  | Maiden flight of Thor-Delta, upper-stage attitude control system malfunctioned
1960-08-12
09:39:43  | Thor DM-19 Delta  | Thor 270
Delta 2  | CCAFS LC-17A  | Echo 1A  | Communications  | MEO  | Success  |
1960-11-23
11:13:03  | Thor DM-19 Delta  | Thor 245
Delta 3  | CCAFS LC-17A  | TIROS-2 | Weather  | SSO  | Success  |
1961-03-25
15:17:04  | Thor DM-19 Delta  | Thor 295
Delta 4  | CCAFS LC-17A  | Explorer 10 | Magnetospheric  | HEO  | Success  |
1961-07-12
10:25:06  | Thor DM-19 Delta  | Thor 286
Delta 5  | CCAFS LC-17A  | TIROS-3 | Weather  | SSO  | Success  |
1961-08-16
03:21:05  | Thor DM-19 Delta  | Thor 312
Delta 6  | CCAFS LC-17A  | Explorer 12 | Magnetospheric  | HEO  | Success  |
1962-02-08
12:43:45  | Thor DM-19 Delta  | Thor 317
Delta 7  | CCAFS LC-17A  | TIROS-4 | Weather  | SSO  | Success  |
1962-03-07
16:06:18  | Thor DM-19 Delta  | Thor 301
Delta 8  | CCAFS LC-17A  | OSO-1  | Solar  | LEO  | Success  |
1962-04-26
18:00:16  | Thor DM-19 Delta  | Thor 320
Delta 9  | CCAFS LC-17A  | Ariel 1 | Ionospheric  | LEO  | Success  |
1962-06-19
12:19:01  | Thor DM-19 Delta  | Thor 321
Delta 10  | CCAFS LC-17A  | TIROS-5 | Weather  | SSO  | Success  |
1962-07-10
08:35:05  | Thor DM-19 Delta  | Thor 316
Delta 11  | CCAFS LC-17B  | Telstar 1 | Communication  | MEO  | Success  |
1962-09-18
08:53:08  | Thor DM-19 Delta  | Thor 318
Delta 12  | CCAFS LC-17A  | TIROS-6 | Weather  | SSO  | Success  | Final flight of Thor-Delta

## See also

* List of Delta 4 launches
* List of Thor and Delta launches
* List of Thor and Delta launches (1960–1969)
* List of Delta IV Heavy launches
* List of Delta IV Medium launches
* Thor-Delta

## References

1. ↑ Wade, Mark. "Delta". Encyclopedia Astronautica. http://www.astronautix.com/lvs/delta.htm.
2. ↑ Krebs, Gunter. "Thor family". Gunter's Space Page. http://space.skyrocket.de/doc_lau_fam/thor.htm.

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