Discoverer 35

Discoverer 35
Discoverer 35
Operator US Air Force/NRO
Major contractors Lockheed
Bus KH-3 Corona'''
Agena-B
Mission type Optical reconnaissance
Launch date 15 November 1961
21:23 UTC
Carrier rocket Thor DM-21 Agena-B 326
Launch site Vandenberg LC-75-3-4
Mission duration 1 day
Orbital decay 3 December 1961
COSPAR ID 1961 Alpha Zeta 1
Mass 2,100 kilograms (4,600 lb)
Orbital elements
Regime Low Earth
Inclination 81.6°
Apoapsis 247 kilometres (153 mi)
Periapsis 233 kilometres (145 mi)
Orbital period 89.3 minutes
The launch of Discoverer 35

Discoverer 35, also known as Corona 9028, was an American optical reconnaissance satellite which was launched in 1961. It was a KH-3 Corona''' satellite, based around an Agena-B.[1]

The launch of Discoverer 35 occurred at 21:23 UTC on 15 November 1961. A Thor DM-21 Agena-B rocket was used, flying from Launch Complex 75-3-4 at the Vandenberg Air Force Base.[2] Upon successfully reaching orbit, it was assigned the Harvard designation 1961 Alpha Zeta 1.

Discoverer 35 was operated in a low Earth orbit, with a perigee of 233 kilometres (145 mi), an apogee of 247 kilometres (153 mi), 81.6 degrees of inclination, and a period of 89.3 minutes.[3] The satellite had a mass of 2,100 kilograms (4,600 lb),[4] 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).[5] Images were recorded onto 70-millimetre (2.8 in) film, and returned in a Satellite Recovery Vehicle just over a day after launch.[4] The Satellite Recovery Vehicle used by Discoverer 35 was SRV-523.[2] The SRV was successfully recovered. Apart from the presence of some emulsion on the images it returned, Discoverer 35 completed its mission successfully. It subsequently remained in orbit until it decayed on 3 December 1961.[3]


References

  1. ^ Krebs, Gunter. "KH-3 Corona". Gunter's Space Page. http://space.skyrocket.de/doc_sdat/kh-3.htm. Retrieved 30 June 2010. 
  2. ^ a b McDowell, Jonathan. "Launch Log". Jonathan's Space Page. http://planet4589.org/space/log/launchlog.txt. Retrieved 30 June 2010. 
  3. ^ a b McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. http://planet4589.org/space/log/satcat.txt. Retrieved 30 June 2010. 
  4. ^ a b Wade, Mark. "KH-3". Encyclopedia Astronautica. http://www.astronautix.com/craft/kh3.htm. Retrieved 30 June 2010. 
  5. ^ "Corona". Mission and Spacecraft Library. NASA. http://msl.jpl.nasa.gov/programs/corona.html. Retrieved 30 June 2010. 



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