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It was built by [[Khrunichev State Research and Production Space Center|Khrunichev]], and launched from sites [[Baikonur Cosmodrome Site 81|81]] and [[Baikonur Cosmodrome Site 200|200]] at the [[Baikonur Cosmodrome]] in [[Kazakhstan]]. The maiden flight on 10 March 1967 carried a [[Soyuz 7K-L1]] as part of the [[Zond program]]. During the so-called [[Moon Race#Soviet circumlunar loop flights (1967–1970)|Moon Race]] these Proton/Soyuz/Zond flights consisted of several uncrewed test flights of [[Soyuz (spacecraft)|Soyuz spacecraft]] to [[highly elliptical orbit|highly elliptical]] or [[circumlunar trajectory|circumlunar]] orbits with the unrealized aim of [[Soviet human lunar programs|landing Soviet cosmonauts on the Moon]]. It was retired from service in favour of the modernised [[Proton-M]], making its 310th and final launch on 30 March 2012. ==Vehicle description== The baseline Proton-K was a three-stage rocket. Thirty were launched in this configuration, with payloads including all of the Soviet Union's [[Salyut program|''Salyut'']] [[space stations]], all [[Mir]] modules with the exception of the [[Mir Docking Module|Docking Module]], which was launched on the United States [[Space Shuttle]], and the [[Zarya (ISS module)|Zarya]] and [[Zvezda (ISS module)|Zvezda]] modules of the [[International Space Station]]. It was intended to launch Chelomey's crewed [[TKS spacecraft]], and succeeded in launching four uncrewed tests flights prior to the program's cancellation. It was also intended for Chelomey's 20-ton [[LKS (spacecraft)|LKS]] [[spaceplane]] that was never realised. [[File:Early Proton-K rocket versions.jpg|thumb|The early Proton-K launch configurations from 1965 to 1971]] Like other members of the [[Universal Rocket]] family, the Proton-K was fuelled by [[unsymmetrical dimethylhydrazine]] and [[nitrogen tetroxide]]. These [[hypergolic]] propellants ignite on contact, avoiding the need for an ignition system, and can be stored at ambient temperatures. This avoids the need for low-temperature–tolerant components, and allowed the rocket to sit on the pad fully fuelled for long periods of time. In contrast, [[cryogenic fuel]]s would have required periodic topping-up of propellants as they boil off. The propellants used on the Proton, were, however, [[corrosive]] and [[toxic]] and required special handling. The Russian Government paid for the cleanup of residual propellant in spent stages that impact downrange. Proton components were built in factories near Moscow, then transported by rail to the final assembly point near the pad. The first stage of the Proton-K consisted of a central oxidiser tank, and six outrigger fuel tanks. This separated as one piece from the second stage, which was attached by means of a lattice structure interstage. The second stage ignited prior to first stage separation, and the top of the first stage was insulated to ensure that it retained its structural integrity until separation. The first stage used six RD-253 engines, designed by [[Valentin Glushko]]. The RD-253 is a single-chamber engine and uses a [[Staged combustion cycle|staged combustion]] cycle. The first-stage guidance system was open-loop, which required significant amounts of propellant to be held in reserve. The third stage was powered by an [[RD-0210]] engine and four [[vernier thruster|vernier]] nozzles, with common systems. The verniers provided steering, eliminating the need for [[gimbal]]ling of the main engine. They also aided stage separation, and acted as [[ullage motor]]s. Ducts built into the structure channelled vernier exhaust before stage separation. The third stage guidance system was also used to control the first and second stages earlier in flight. Many launches used an upper stage to boost the payload into a higher orbit. [[Blok D]] upper stages were used on forty flights, the majority of which were for the [[Luna programme|Luna]] and [[Zond program|Zond]] programmes. Ten flights used the [[Blok D-1]], mostly to launch spacecraft towards [[Venus]]. [[Blok D-2]] upper stages were used three times, with the [[Fobos 1]], [[Fobos 2]] and [[Mars 96]] spacecraft. The [[Blok DM]] upper stage was used on 66 launches. The most commonly used upper stage was the [[Blok DM-2]], which was used on 109 flights, mostly with [[GLONASS]] and [[Raduga (satellite)|Raduga]] satellites. Fifteen launches used the modernised [[Block DM-2M]] stage, mostly carrying [[Ekspress]] satellites, however other satellites, including [[Eutelsat]]'s [[SESAT 1]], also used this configuration. Two [[Araks (satellite)|Araks]] satellites were launched using [[Block DM-5]] upper stages. The [[Block DM1]], a commercial version of the DM-2, was used to launch [[Inmarsat-3 F2]]. The [[Block DM2]] upper stage was used to launch three groups of seven [[Iridium (satellite)|Iridium]] satellites, including [[Iridium 33]]. This configuration was also used to launch [[INTEGRAL]] for the [[European Space Agency]]. [[Block DM3]] stages were used on twenty five launches, almost exclusively carrying commercial satellites. [[Telstar 5]] was launched with a [[Block DM4]]. The [[Briz-M]] upper stage was used for four launches; three carrying payloads for the Russian Government, and one commercial launch with [[GE-9]] for [[GE Americom]].<ref>{{cite web|url=http://space.skyrocket.de/doc_lau_fam/proton.htm|title=Proton|first=Gunter|last=Krebs|publisher=Gunter's Space Page}}</ref> One launch was reported to have used a [[Block DM-3]] upper stage, however this may have been a reporting error, and it is unclear whether this launch actually used a DM-3, DM3, or DM-2. ==List of launches== {{main|List of Proton launches}} Due to its rushed development, the Proton K launch vehicle had a low success rate initially. However, the issues were rectified and it went on to become one of the most widely used heavy launch vehicle. ==Launch failures== {{cleanup|reason=Incorrect payload names and target orbits, inclusion of successful launches in list of failures|date=July 2013}} :''Source''<ref>International reference guide to space launch systems, Fourth Edition, pp. 308-314, {{ISBN|1-56347-591-X}}</ref> {| class="wikitable" |- !Flight number !! Date (UMC) !! Vehicle model !! Payload !! Payload mass, kg !! Orbit (intended) !! Orbit (actual) !! Notes |- | 7 || September 27, 1967 || Proton K/D || Zond || 5375 || Moon || {{no|?}} || One first-stage engine did not start at liftoff due to a rubber plug accidentally left inside during assembly, causing control to gradually fail during ascent. The cutoff command was issued at T+97 seconds and the booster crashed downrange, but the [[Launch Escape System]] (LES) pulled the Zond descent module to safety. |- | 8 || November 22, 1967 || Proton K/D || Zond || 5375 || Moon || {{no|no}} ||One second-stage engine failed to ignite at staging. The remaining three engines were shut down automatically and the booster crashed downrange. Once again, the LES pulled the capsule away to safety. Cause was determined to be premature release of fuel into the second stage, resulting in overheating and engine failure. |- | 10 || April 22, 1968 || Proton K/D || Zond || 5375 || Moon || {{no|?}} ||A malfunction in the LES accidentally shut down the second stage at T+260 seconds and triggered an abort. The capsule was successfully recovered. |- | 14 || January 20, 1969 || Proton K/D || Zond || 5375 || Moon || {{no|no}} ||Second stage turbopump failure at T+313 seconds. The LES once again lifted the Zond capsule to safety. |- | 15 || February 19, 1969 || Proton K/D || Luna probe || 2718 || Moon || {{no|no}} ||Payload fairing collapsed at T+51 seconds. Flying debris ruptured the first stage and caused leaking propellant to ignite on contact with the engine exhaust, resulting in the explosion of the launch vehicle. |- | 16 || March 27, 1969 || Proton K/D || Mars probe || 4650 || [[Heliocentric orbit|Heliocentric]] || {{no|?}} || Third stage turbopump failure at T+438 seconds. The upper stages and payload crashed in the Altai mountains. |- | 17 || April 2, 1969 || Proton K/D || Mars probe || 4650 || [[Heliocentric orbit|Heliocentric]] || {{no|?}} ||A fire in one of the first stage engines caused an almost immediate control loss at liftoff. The booster reached an altitude of 300m and began flying horizontally before the cutoff command was issued, causing it to plunge nose-first into the ground. Launch complex personnel were unable to leave the Baikonour Cosmodrome due to one exit being blocked by the still-intact second stage and the other by a large puddle of nitrogen tetroxide. They had no choice but to remain there until a rain came and washed the spilled fuel away. |- | 18 || June 14, 1969 || Proton K/D || Luna probe || 2718 || Moon || {{no|?}} ||Blok D stage failed to ignite and the probe reentered the atmosphere |- | 18 || September 23, 1969 || Proton K/D || Luna probe || ? || Moon || {{no|?}} ||Blok D LOX valve failure. The probe remained in LEO until reentering. |- | 18 || October 22, 1969 || Proton K/D || Luna probe || ? || Moon || {{no|?}} ||Blok D control malfunction. Probe failed to leave LEO. |- | 23 || November 28, 1969 || Proton K/D || Soyuz || ? || ? || {{no|?}} ||Pressure sensor malfunction caused first stage cutoff at T+128 seconds |- | 24 || February 6, 1970 || Proton K/D || Luna || 5600 || Moon || {{no|no}} || At T+128.3 s, flight safety system automatically shut off first-stage engine because of false alarm from pressure gauge. |- | 30 || May 10, 1971 || Proton K/D || [[Kosmos 419]] || 4650 || [[Heliocentric orbit|Heliocentric]] || {{no|[[Low Earth orbit|LEO]]}} || Block D flight sequencer programmed incorrectly, resulting in failure to perform second burn or payload separation. Reportedly the coast time between burns was set to 1.5 years instead of 1.5 hours. |- | 36 || July 29, 1972 || Proton K || [[DOS-2]] || 18000 || [[Low Earth orbit|LEO]] || {{No|no}} || At T+181.9 d second-stage stabilization system failed because of short circuit in pitch and yaw channels of the automated stabilization system. |- | 53 || October 16, 1975 || Proton K/D ||Luna|| ? || Moon || {{No|[[Low Earth orbit|LEO]]}} || Failure of fourth-stage oxidizer booster pump. |- | 62 || August 4, 1977 || Proton K || Almaz || ? || [[Low Earth orbit|LEO]] || {{No|no}} || At T+41.1 s, a first-stage engine steering unit failed, causing loss of stability and automatic thrust termination at T+53.7 s. |- | 66 || May 27, 1978 || Proton K/DM ||Ekran|| 1970 || [[Geostationary orbit|GEO]] || {{no|no}} || Vehicle stability loss at T+87 s because of an error in first-stage No. 2 engine steering unit. Fault attributed to fuel leak in second-stage engine compartment, which caused control cables to overheat. |- | 68 || August 17, 1978 || Proton K/DM ||Ekran|| 1970 || [[Geostationary orbit|GEO]] || {{no|no}} || Loss of stability at T+259.1 s caused flight termination. Hot gas leak from second-stage engine because of faulty seal on pressure gauge led to failure of electrical unit for automatic stabilization. |- | 71 || October 17, 1978 || Proton K/DM ||Ekran|| 1970 || [[Geostationary orbit|GEO]] || {{no|no}} || At T+235.62 s, second-stage engine shut off with resultant loss of stability caused by a turbine part igniting in turbopump gas tract followed by gas inlet destruction and hot air ejection into second rear section. |- | 72 || December 19, 1978 || Proton K/DM ||Gorizont 1|| 1970 || [[Geostationary orbit|GEO]] || {{Partial|[[Geostationary orbit|GEO]], inclination 11.0}} || Block DM was misaligned for GEO injection burn, resulting in non-circular orbit with 11 deg. inclination |- | 95 || July 22, 1982 || Proton K/DM ||Ekran|| 1970 || [[Geostationary orbit|GEO]] || {{No|no}} || First-stage engine No. 5 suffered failure of hydraulic gimbal actuator because of dynamic excitation at T+45 seconds. Automatic flight shutdown commanded. This would be the last first-stage malfunction of a Proton until 2013. |- | 100 || December 24, 1982 || Proton K/DM ||Raduga|| 1965 || [[Geostationary orbit|GEO]] || {{No|no}} || Second-stage failure T+230 seconds due to high-frequency vibration. |- | 144 || November 29, 1986 || Proton K || Raduga || 1965 || || {{No|no}} || Second stage control failure due to an electrical relay becoming separated from vibration |- | 145 || January 30, 1987 || Proton K/DM-2 ||[[List of Kosmos satellites (1751–2000)|Kosmos-1817]]|| 1965 || || {{No|incorrect [[Low Earth orbit|LEO]]}} || Fourth stage failed to start because of control system component failure. |- | 148 || April 24, 1987 || Proton K/DM-2 ||Kosmos 1838-1840 ([[Glonass]])|| 3x1260 || [[Medium Earth orbit|MEO]] || {{No|[[Low Earth orbit|LEO]]}} || Fourth stage shut down early and failed to restart. Failure occurred in control system because of manufacturing defect in instrument. |- | 158 || January 18, 1988 || Proton K/DM-2 ||Gorizont|| 2500 || [[Geostationary orbit|GEO]] || {{No|no}} || Third-stage engine failure caused by destruction of fuel line leading to mixer. |- | 159 || February 17, 1988 || Proton K/DM-2 ||Kosmos 1917-1919 ([[Glonass]])|| 3x1260 || [[Medium Earth orbit|MEO]], inclination 64.8 || {{No|no}} || Fourth-stage engine failure because of high combustion chamber temperatures caused by foreign particles from propellant tank. |- | 187 || August 9, 1990 || Proton K/DM-2 ||Ekran M|| ? || [[Geostationary orbit|GEO]] || {{No|no}} || Second-stage engine shutoff because of termination of oxidizer supply due to fuel line being clogged by a wiping rag. |- | 212 || May 27, 1993 || Proton K/DM-2 ||Gorizont|| 2500 || [[Geostationary orbit|GEO]] || {{No|no}} || Second- and third-stage engines suffered multiple burn-throughs of combustion chambers because of propellant contamination. |- | 237 || February 19, 1996 || Proton K/DM-2 ||Raduga 33|| 1965 || [[Geostationary transfer orbit|GTO]] || {{No|no}} || Block DM-2 stage failed at ignition for second burn. Suspected causes were failure of a tube joint, which could cause a propellant leak, or possible contamination of hypergolic start system. |- | 243 || November 16, 1996 || Proton K/D-2 ||[[Mars 96]]|| 6825 || [[Heliocentric orbit|Heliocentric]] || {{No|too low [[Low Earth orbit|LEO]]}} || Block D-2 fourth-stage engine failed to reignite to boost spacecraft into desired transfer orbit; injection burn did not propel spacecraft out of Earth orbit. Spacecraft and upper stage reentered after a few hours. Root cause could not be determined because of lack of telemetry coverage, but suspected cause was failure of Mars 96 spacecraft, which was controlling Block D stage, or poor integration between spacecraft and stage. |- | 252 || December 24, 1997 || Proton K/DM3 ||[[PAS-22]]|| 3410 || [[Geostationary transfer orbit|GTO]] || {{Partial|inclined [[Geostationary transfer orbit|GTO]]}} || Block DM shut down early because of improperly coated turbopump seal, leaving spacecraft in high-inclination geosynchronous transfer orbit. Customer declared spacecraft a total loss and collected insurance payment. However, Hughes salvaged the spacecraft using spacecraft thrusters to raise orbit apogee to perform two lunar swingbys, which lowered inclination and raised perigee. Apogee was then lowered to achieve a geosynchronous orbit inclined 8 deg. Spacecraft has become available for limited use. |- | 265 || July 5, 1999 || Proton K/Briz-M ||Raduga 1-5|| 1965 || [[Geostationary transfer orbit|GTO]] || {{No|no}} ||Maiden flight of [[Briz-M]] upper stage. Contaminants from welding defect in the turbopump caused the second-stage engine No. 3 to catch fire, destroying the rear section of the stage. |- | 268 || October 27, 1999 || Proton K/DM-2 ||Ekspress 1A|| 2600 || [[Geostationary orbit|GEO]] || {{No|no}} ||Particulate contamination caused the turbine exhaust duct of second stage engine No. 1 to catch fire at T+223 s, resulting in rapid shutdown of the stage. This and the previous failure in July were attributed to poor workmanship at the Voronezh engine plant. Both engines were part of the same batch built in 1993, during a period when production decreased significantly. |- | 295 || November 26, 2002 || Proton K/DM3 ||Astra 1K|| 2250 || [[Geostationary transfer orbit|GTO]] || {{No|no}} ||A failed valve caused excess fuel to collect in the Block DM main engine during the parking orbit coast phase after the first burn. The engine was destroyed. |- |} ==See also== *[[Comparison of heavy lift launch systems]] *[[List of Proton launches]] ==References== {{reflist}} {{Universal Rocket}} {{Expendable launch systems}} {{Russian launch vehicles}} [[Category:Universal Rocket (rocket family)]] [[Category:Space launch vehicles of Russia]] [[Category:Space launch vehicles of the Soviet Union]] [[Category:Vehicles introduced in 1967]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p><span id="templatesused">Pages transcluded onto the current version of this page<span class="posteditwindowhelplinks"> (<a href="/wiki/Help:Transclusion" title="Help:Transclusion">help</a>)</span>:</span> </p></div><ul> <li><a href="/wiki/Template:Ambox" title="Template:Ambox">Template:Ambox</a> (<a href="/w/index.php?title=Template:Ambox&action=edit" title="Template:Ambox">view source</a>) (template editor protected)</li><li><a href="/wiki/Template:Both" title="Template:Both">Template:Both</a> (<a 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