Discoverer 28

Short description: Reconnaissance satellite

Discoverer 28

Mission type| Optical reconnaissance
Operator| United States Air Force /NRO
Mission duration| Failed to orbit
Spacecraft properties
Spacecraft type| Corona KH-2
Bus| Agena-B
Manufacturer| Lockheed
Launch mass| 1,150 kilograms (2,540 lb)
Start of mission
Launch date| 4 August 1961, 00:01 (1961-08-04UTC00:01Z) UTC
Rocket| Thor DM-21 Agena-B 309
Launch site| Vandenberg Air Force Base LC-75-1-1
Orbital parameters
Reference system| Geocentric
Regime| Low Earth
Epoch| Planned

Discoverer

<- Discoverer 27

Discoverer 29 ->

Corona KH-2

<- Corona 9019

Corona 9026 ->

The launch of Discoverer 28

Discoverer 28, also known as Corona 9021, was an American optical reconnaissance satellite which was lost in a launch failure in 1961. It was the seventh of ten Corona KH-2 satellites, based on the Agena-B.[1]

The launch of Discoverer 28 occurred at 00:01 UTC on 4 August 1961. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-1-1 at the Vandenberg Air Force Base .[2] It failed to achieve orbit after the Agena's guidance and control system malfunctioned.[3][4]

Discoverer 28 was to have operated in a low Earth orbit. The satellite had a mass of 1,150 kilograms (2,540 lb),[5] and was equipped with a panoramic camera with a focal length of 61 centimetres (24 in), which had a maximum resolution of 7.6 metres (25 ft).[4] Images were to have been recorded onto 70-millimeter (2.8 in) film, and returned in a Satellite Recovery Vehicle. The Satellite Recovery Vehicle carried by Discoverer 28 was SRV-512.[5]

## References

1. ↑ Krebs, Gunter. "KH-2 Corona". Gunter's Space Page. https://space.skyrocket.de/doc_sdat/kh-2.htm. Retrieved 23 October 2020.
2. ↑ McDowell, Jonathan. "Launch Log". Jonathan's Space Page. http://planet4589.org/space/log/launchlog.txt. Retrieved 26 June 2010.
3. ↑ Pike, John (9 September 2000). "KH-2 Corona". Federation of American Scientists. http://www.fas.org/spp/military/program/imint/kh-2.htm. Retrieved 23 June 2010.
4. ↑ 4.0 4.1 "Corona". Mission and Spacecraft Library. NASA. Archived from the original on 3 October 2007. https://web.archive.org/web/20071003082210/http://msl.jpl.nasa.gov/Programs/corona.html. Retrieved 26 June 2010.
5. ↑ 5.0 5.1 Wade, Mark. "KH-2". Encyclopedia Astronautica. Archived from the original on 23 October 2012. https://web.archive.org/web/20121023094149/http://www.astronautix.com/craft/kh2.htm. Retrieved 26 June 2010.

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