Zenit-2

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Zenit-2
Zenit-2 rocket ready for launch.jpg
Zenit-2 at Site 45/1
FunctionCarrier rocket
ManufacturerYuzhnoye
Country of originSoviet Union
(Ukraine)
Size
Height57 metres (187 ft)[1]
Diameter3.9 metres (13 ft)[1]
Mass460,000 kilograms (1,010,000 lb)[1]
StagesTwo
Capacity
Payload to LEO13,740 kilograms (30,290 lb)
11,420 kilograms (25,180 lb) (ISS orbit)[1]
Payload to SSO5,000 kilograms (11,000 lb)
Associated rockets
FamilyZenit
DerivativesZenit-2M
Zenit-3SL
Launch history
StatusRetired
Launch sitesBaikonur Site 45
Total launches36[2]
Successes28
Failures7
Partial failures1
First flight13 April 1985
Last flight10 June 2004
First stage
Engines1 RD-171
Thrust8,180 kilonewtons (1,840,000 lbf)
Specific impulse337 s
Burn time150 seconds
FuelRP-1/LOX
Second stage
Engines1 RD-120
1 RD-8
Thrust912 kilonewtons (205,000 lbf)
79.5 kilonewtons (17,900 lbf)
Specific impulse349 s
Burn time315 seconds
FuelRP-1/LOX

The Zenit-2 is a Ukrainian, previously Soviet, expendable carrier rocket. First flown in 1985, it has been launched 37 times, with 6 failures. It is a member of the Zenit family of rockets and was designed by the Yuzhnoye Design Bureau.

History[edit]

With 13–15 ton payload in LEO, it was intended as up-middle-class launcher greater than 7-ton-payload middle Soyuz and smaller than 20-ton-payload heavy Proton. Zenit-2 would be certified for crewed launches and placed in specially built launch pad at Baykonur spaceport, carrying the new crewed partially reusable Zarya spacecraft that developed in end of the 1980s but was cancelled. Also in the 1980s Vladimir Chelomey's firm proposed the never realised 15-ton Uragan spaceplane, which would have been launched by Zenit-2.

A modified version, the Zenit-2S, is used as the first two stages of the Sea Launch Zenit-3SL rocket.[3] Launches of Zenit-2 rockets are conducted from Baikonur Cosmodrome Site 45/1. A second pad, 45/2, was also constructed, but was only used for two launches before being destroyed in an explosion.[4] A third pad, Site 35 at the Plesetsk Cosmodrome was never completed, and work was abandoned after the dissolution of the Soviet Union.[5]

The Zenit-2 had its last flight in 2004; it has been superseded by the Zenit-2M, which incorporates enhancements made during the development of the Zenit-3SL. The Zenit-2 has a fairly low flight rate, as the Russian government usually avoids flying national-security payloads on Ukrainian rockets. Zenit-2M itself flew only twice: in 2007 and 2011.

During the late 1990s, the Zenit-2 was marketed for commercial launches. Only one such launch was conducted, with a group of Globalstar satellites, which ended in failure after a computer error resulted in the premature cutoff of the second stage.

Launch history[edit]

References[edit]

  1. ^ a b c d "Zenit-2". Roscosmos (in Russian). Retrieved 7 April 2016.
  2. ^ Krebs, Gunter. "Zenit-2". Gunter's Space Page. Retrieved 2016-05-16.
  3. ^ "The Rocket – Zenit-3SL". Sea Launch. Archived from the original on 2009-04-04. Retrieved 2009-04-14.
  4. ^ Wade, Mark. "Zenit". Encyclopedia Astronautica. Retrieved 2009-04-14.
  5. ^ Wade, Mark. "Plesetsk". Encyclopedia Astronautica. Archived from the original on 2007-12-29. Retrieved 2009-04-14.