Zenit (Russian:Зени́т,IPA:[zʲɪˈnʲit],Zenith) was a series of militaryphotoreconnaissance satellites launched by theSoviet Union between 1961 and 1994. To conceal their nature, all flights were given the publicKosmos designation.

Zenit

Zenit re-entry capsule, showing camera ports
Manufacturer	OKB-1
Country of origin	Soviet Union
Operator	Soviet space program
Applications	Photo reconnaissance
Production
Status	Retired
Launched	688
Lost	21
Maiden launch	11 Dec 1961 Zenit 2-1
Last launch	7 Jun 1994 Kosmos 2281
Last retirement	8 Nov 2004 Zenit 8-103
Related spacecraft
Derived from	Vostok

The basic design of the Zenit satellites was similar to theVostok crewed spacecraft, sharing the return and service modules.^[1] It consisted of a spherical re-entry capsule 2.3 metres (7.5 ft) in diameter with a mass of around 2,400 kilograms (5,300 lb). This capsule contained the camera system, its film, recovery beacons, parachutes and a destruct charge. In orbit, this was attached to a service module that contained batteries, electronic equipment, an orientation system and a liquid-fuelled rocket engine that would slow the Zenit for re-entry, before the service module detached. The total length in orbit was around 5 metres (16 ft) and the total mass was between 4,600 and 4,740 kilograms (10,140 and 10,450 lb).^[1]

Unlike the AmericanCORONA spacecraft, the return capsule carried both the film and the cameras and kept them in a temperature-controlled pressurised environment. This simplified the design and engineering of the camera system but added considerably to the mass of the satellite. An advantage was that cameras could be reused.^[1] The camera would either land on the ground or be recovered in midair by a modifiedMil Mi-8 helicopter.^[2]

Early Zenits were launched using theVostok rocket; later versions used theVoskhod and theSoyuz rockets. The first flights were launched fromBaikonur Cosmodrome but subsequent launches also took place atPlesetsk Cosmodrome.

Most Zenits flew in a slightly ellipticalorbit with aperigee of around 200 kilometres (120 miles) and anapogee between 250 and 350 kilometres (160 and 220 miles); the missions usually lasted between 8 and 15 days.

In 1956, the Soviet government issued a secret decree that authorised the development of "Object D" which led to the program to launchSputnik 3 (Sputnik 1 was a simplified spin-off of the Object D program.) The text of the decree remains secret, but it apparently authorised another satellite program – "Object OD-1" – which was to be used for photo-reconnaissance from space.

By 1958, theOKB-1 design bureau was simultaneously working on Object OD-1 and Object OD-2 – an early design for theVostok crewed spacecraft. The development of Object OD-1 was experiencing serious difficulties so the head of OKB-1,Sergei Korolev, initiated work to see if a design based on Object OD-2 could be used for an uncrewed photo-reconnaissance satellite. This may have been a political manoeuvre that would enable him to continue the crewed space program and avoid diverting more of OKB-1's resources into Object OD-1.^[1][3][4][5]

Despite bitter opposition from the military the Soviet government endorsed Korolev's approach and issued decrees on 22 and 25 May 1959 which ordered the development of three different spacecraft, all based on the same basic, Object OD-2, design. Spacecraft 1K would be a simplified prototype, 2K was to be a reconnaissance satellite and 3K was to be for crewed flights. The nameVostok was also initially used for all three of these craft. But in 1961 the name became publicly known as the name ofYuri Gagarin's spacecraft so the "Vostok 2" reconnaissance satellite was renamed "Zenit 2".^[6]

The first Zenit launch attempt took place on 11 December 1961, but there was a fault in the rocket's third stage and the spacecraft was destroyed using its destruct charge. The second attempt — publicly referred to asKosmos 4 — was successfully launched on 26 April 1962 and re-entered three days later. However a failure in the orientation system meant few useful pictures were obtained; usable pictures had a resolution of about 5 to 7 meters. Launch #3 on 1 June 1962 failed dramatically when one of the 8A92 booster's strap-ons shut down at liftoff and fell onto the pad, exploding on impact. The rest of the launch vehicle crashed 300 meters away. This accident caused considerable damage to Site 1, delaying the flights ofVostok 3 andVostok 4 by two months.

On 28 July 1962, Site 1 was back in service to host the next Zenit flight, which performed successfully. Testing continued over the next year largely without incident but on 10 July 1963, another launch accident occurred in practically identical fashion to the June 1962 failure. Once again, one of the strap-ons shut down at liftoff, separated from the booster, and exploded on impact with the pad while the rest of the launch vehicle crashed a few hundred feet away.

Examination of telemetry from the booster indicated that some sort of electrical failure occurred, but subsequent investigation took three months and finally concluded that a switch designed to cut power to the strap-ons at staging had malfunctioned, possibly due to liftoff-induced vibration. The electrical circuit in the 8A92 was redesigned and it never again experienced problems with the strap-ons shutting down at launch.^[7]

Many versions of the satellite were developed for different reconnaissance missions and flights continued until 1994.^[8][9]

Zenit 2 was the first version to be launched between 1961 and 1970 (there was no Zenit 1).^[10][11]

The arrangement of cameras varied, but most flights carried four cameras of 1000 mm focal length, and one of 200 mm focal length. The single lower resolution camera was intended to provide low-resolution pictures that would help give a context to the high-resolution pictures.^[1]

Each camera had 1500 frames of film and from 200 km (120 mi), each frame held an image of a 60 by 60 km (37 by 37 mi) square. The ground resolution was stated to be 10 to 15 m (33 to 49 ft) although some unofficial sources claim it was much better—one source claims the number of cars in a car park could be counted. The cameras were developed at theKrasnogorsk Optical-Mechanical Factory near Moscow. The Krasnogorsk factory, which had been producing a variety of optical equipment for the military since 1942, was also the manufacturer of the popularZenit SLR cameras.^[1]

Zenit 2s also carriedELINT equipment called Kust-12M (bush) to receiveNATO radar signals. The satellites carried aparabolic antenna, around 1 m (3 ft 3 in) in diameter, that is associated with this equipment. However, it is unclear if the antenna transmitted recorded signals to the ground or was for intercepting radar signals. In the latter case they would have been recorded on magnetic tape, to be retrieved after the return capsule landed.^[1][12]

There were 81 Zenit 2 launches. 58 were successful and 11 were partially successful. There were 12 failed missions, 5 because of a satellite malfunction and 7 because of a failure in the launch vehicle.

Improvements included a new camera system and the addition of solar panels. As the spacecraft mass was increased to 6300 kg, the Vostok rocket was replaced by theVoskhod rocket andSoyuz rockets. In common with Zenit 2 satellites this also had anELINT payload.^[12]

A total of 101 Zenit-2M satellites were launched between 1968 and 1979^[13][14][15]

Unlike Zenit 2, little information on Zenit 4 has been released. The Zenit 4 was intended for high-resolution photography and carried one camera of 3000 mm focal length as well as a 200 mm camera. The focal length of the main camera was greater than the diameter of the capsule so the camera made use of a mirror to fold the light path. The ground resolution is not publicly known but it is believed to have been 1–2 metre.

The Zenit 4 had a mass of 6300 kg — around 1800 kg more than the Zenit 2. So, instead of the Vostok rocket, it was launched by the heavier Voskhod rocket. A total of 76 Zenit-4 satellites were flown between 1963 and 1970.^[1][16][17]

An improved version of the Zenit 4, the Zenit 4M carried a new camera,solar panels, and a restartable engine so the satellite's orbit could be altered during the course of its mission. The mission duration was 13 days.

A total of 61 Zenit-4M satellites were launched between 1968 and 1974.^[18][19]

These may have been versions of the Zenit 4 designed specifically to fly in lower orbits to improve image resolution. Some sources claim they were fitted with devices to compensate for aerodynamic drag and to withstand the effects ofaerodynamic heating.

A total of 80 Zenit-4MK satellites were launched between 1969 and 1977.^[20][21]

Intended to replace the 4MK design, the 4MKM may have been a low altitude variant of the later Zenit-6U and have similar equipment to it^[22]

Another variant of the Zenit-4 design equipped with a Priroda-3 camera, intended for the investigation of natural resources in the interests of the Soviet economy and international cooperation.^[25]

A total of 27 Zenit-4MKT satellites were launched between 1975 and 1985.^[26][27]

A special version of the Zenit 4M intended fortopographical photography. It carried an SA-106 topographic camera, a laser altimeter and Doppler apparatus.

A "universal" version of the Zenit, intended for both low-altitude, high-resolution missions and higher-altitude, general observation missions. All flights used the Soyuz launch vehicle. There were a total of 97 Zenit-6U satellites launched between 1976 and 1984.^[30][31]

This was intended for militarycartographic photography. It used a Soyuz launch vehicle and launches took place from both Baikonur and Plesetsk. It had a 15-day orbital life. Similar satellites were referred to using the "Resurs-DK No.1" designation.

A total of 102 Zenit-8 satellites were launched between 1984 and 1994, in addition to one sent into a suborbital trajectory during the maiden flight of theSoyuz-2 rocket in 2004.^{[32][33][34][35]}

A Zenit satellite was mentioned in the movieMission: Impossible – Dead Reckoning Part One.