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Sputnik 1 ( or ; "Satellite-1", or "PS-1", Простейший Спутник-1 or Prosteyshiy Sputnik-1, "Elementary Satellite 1")Siddiqi, p. 155. was the first . The launched it into an elliptical low Earth orbit on 4 October 1957, orbiting for three weeks before its batteries died, then silently for two more months before falling back into the atmosphere. It was a 58 cm (23 in) diameter polished metal sphere, with four external radio antennas to broadcast radio pulses. Its radio signal was easily detectable even by , and the 65° inclination and duration of its orbit made its flight path cover virtually the entire inhabited Earth. This surprise success precipitated the American and triggered the , a part of the . The launch was the beginning of a new era of political, military, technological, and scientific developments.Swenson, et al, p. 71.

Tracking and studying Sputnik 1 from Earth provided scientists with valuable information. The density of the upper atmosphere could be deduced from its on the orbit, and the propagation of its radio signals gave data about the .

Sputnik 1 was launched during the International Geophysical Year from Site No.1/5, at the 5th range, in Kazakh SSR (now known as the Baikonur Cosmodrome). The satellite travelled at about , taking 96.2 minutes to complete each orbit. It transmitted on 20.005 and 40.002 , which were monitored by radio operators throughout the world. The signals continued for 21 days until the transmitter batteries ran out on 26 October 1957. Sputnik burned up on 4 January 1958 while reentering Earth's atmosphere, after three months, 1440 completed orbits of the Earth, and a distance travelled of about .

Before the launch

Satellite construction project
On 17 December 1954, chief Soviet rocket scientist proposed a developmental plan for an artificial satellite to the Minister of the Defence Industry, . Korolev forwarded a report by Mikhail Tikhonravov, with an overview of similar projects abroad. Tikhonravov had emphasized that the launch of an orbital satellite was an inevitable stage in the development of rocket technology. Создание первых искусственных спутников Земли. Начало изучения Луны. Спутники "Зенит" и "Электрон", book: Гудилин В.Е., Слабкий Л.И.()(Gudilin V., Slabkiy L.)"Ракетно-космические системы (История. Развитие. Перспективы)",М.,1996 (in Russian)

On 29 July 1955, U.S. President Dwight D. Eisenhower announced through his press secretary that, during the International Geophysical Year (IGY), the United States would launch an artificial satellite. A week later, on 8 August, the Politburo of the Communist Party of the Soviet Union approved the proposal to create an artificial satellite. On 30 August – the head of the State Commission on the R-7 rocket test launches – held a meeting where Korolev presented calculation data for a spaceflight trajectory to the Moon. They decided to develop a three-stage version of the R-7 rocket for satellite launches.

On 30 January 1956 the Council of Ministers approved practical work on an artificial Earth-orbiting satellite. This satellite, named Object D, was planned to be completed in 1957–58; it would have a mass of and would carry of scientific instruments. The first test launch of "Object D" was scheduled for 1957. Work on the satellite was to be divided among institutions as follows:

  • the USSR Academy of Sciences was responsible for the general scientific leadership and the supply of research instruments
  • the Ministry of the Defence Industry and its primary design bureau, OKB-1, were assigned the task of building the satellite
  • the Ministry of the Radiotechnical Industry would develop the control system, radio/technical instruments, and the system
  • the Ministry of the Ship Building Industry would develop devices
  • the Ministry of the Machine Building would develop ground launching, refueling and transportation means
  • the Ministry of the Defense was responsible for conducting launches

Preliminary design work was completed in July 1956 and the scientific tasks to be carried out by the satellite were defined. These included measuring the density of the atmosphere and its composition, the , , and . These data would be valuable in the creation of future artificial satellites. A system of ground stations was to be developed to collect data transmitted by the satellite, observe the satellite's orbit, and transmit commands to the satellite. Because of the limited time frame, observations were planned for only 7 to 10 days and orbit calculations were not expected to be extremely accurate.

By the end of 1956 it became clear that the complexity of the ambitious design meant that 'Object D' could not be launched in time because of difficulties creating scientific instruments and the low produced by the completed R-7 engines (304 sec instead of the planned 309 to 310 sec). Consequently, the government rescheduled the launch for April 1958. Object D would later fly as Sputnik 3.Lanius, et al, p. 38.

Fearing the U.S. would launch a satellite before the USSR, OKB-1 suggested the creation and launch of a satellite in April–May 1957, before the IGY began in July 1957. The new satellite would be simple, light (), and easy to construct, forgoing the complex, heavy scientific equipment in favour of a simple radio transmitter. On 15 February 1957 the Council of Ministers of the USSR approved this simple satellite, designated 'Object PS'. This version allowed the satellite to be tracked visually by Earth-based observers, and it could transmit tracking signals to ground-based receiving stations. The launch of two satellites, PS-1 and PS-2, with two R-7 rockets (8K71) was approved, provided that the R-7 completed at least two successful test flights.

Launch vehicle preparation and launch site selection
The R-7 Semyorka was initially designed as an intercontinental ballistic missile (ICBM) by OKB-1. The decision to build it was made by the Central Committee of the Communist Party of the Soviet Union and the Council of Ministers of the USSR on 20 May 1954. The R-7 was also known by its GRAU (later GURVO the Russian abbreviation for "Chief Directorate of the Rocket Forces") designation 8K71.Zaloga, p. 232. At the time, the R-7 was known to NATO sources as the T-3 or M-104,Cox & Stoiko, p. 69. and Type A.Bilstein, p.387. A special commission selected Tyuratam for the construction of a rocket , the 5th Tyuratam range, usually referred to as "NIIP-5", or "GIK-5" in the post-Soviet time. The selection was approved on 12 February 1955 by the Council of Ministers of the USSR, but the site would not be completed until 1958. Actual work on the construction of the site began on 20 July by military building units. On 14 June 1956, decided to adapt the R-7 rocket to the 'Object D' (Sputnik 3), that would later be replaced by the much lighter 'Object PS' (Sputnik 1). Lanius, et al, p. 38

The first launch of an R-7 rocket (8K71 No.5L) occurred on 15 May 1957. A fire began in the Blok D strap-on almost immediately at liftoff, but the booster continued flying until 98 seconds after launch when the strap-on broke away and the vehicle crashed some 400 km downrange. Three attempts to launch the second rocket (8K71 No.6) were made on 10–11 June, but an assembly defect prevented launch. The unsuccessful launch of the third R-7 rocket (8K71 No.7) took place on 12 July. An caused the to put the missile into an uncontrolled roll which resulted in all of the strap-ons separating 33 seconds into the launch. The R-7 crashed about 7 km from the pad.

The launch of the fourth rocket (8K71 No.8), on 21 August at 15:25 , was successful. The rocket's core boosted the dummy warhead to the target altitude and velocity, reentered the atmosphere, and broke apart at a height of after traveling 6,000 km. On 27 August, the TASS issued a statement on the successful launch of a long-distance multistage ICBM. The launch of the fifth R-7 rocket (8K71 No.9), on 7 September, was also successful, but the dummy was also destroyed on atmospheric re-entry, and hence needed a redesign to completely fulfill its military purpose. The rocket, however, was deemed suitable for satellite launches, and Korolev was able to convince the State Commission to allow the use of the next R-7 to launch PS-1,Harford, p. 127. allowing the delay in the rocket's military exploitation to launch the PS-1 and PS-2 satellites.

On 22 September a modified R-7 rocket, named Sputnik and indexed as 8K71PS,Siddiqi, p. 163. arrived at the proving ground and preparations for the launch of PS-1 began. 45th Anniversary of the First Start of Native ICBM R-7 at Ukrainian Aerospace Portal Compared to the military R-7 test vehicles, the mass of 8K71PS was reduced from 280 tonnes to 272 tonnes; its length with PS-1 was and the at liftoff was .

Observation complex
PS-1 was not designed to be controlled; it could only be observed. Initial data at the launch site would be collected at six separate observatories and telegraphed to NII-4. Located back in Moscow (at Bolshevo), NII-4 was a scientific research arm of the Ministry of Defence that was dedicated to missile development.Siddiqi, p. 39. The six observatories were clustered around the launch site, with the closest situated from the launch pad.

A second, nationwide observation complex was established to track the satellite after its separation from the rocket. Called the Command-Measurement Complex, it consisted of the coordination center in NII-4 and seven distant stations situated along the line of the satellite's .Siddiqi, p. 162. These tracking stations were located at , , , Klyuchi, , in , and in . Stations were equipped with , optical instruments, and communications systems. Data from stations were transmitted by into NII-4 where specialists calculated orbital parameters.

The observatories used a trajectory measurement system called "Tral", developed by (Moscow Energy Institute), by which they received and monitored data from mounted on the R-7 rocket's core stage. Wonderful "Seven" and First Satellites at the website of OKB MEI The data was useful even after the satellite's separation from the second stage of the rocket; Sputnik's location was calculated from the data on the second stage's location which followed Sputnik at a known distance. Yu.A.Mozzhorin Memories at the website of Russian state archive for scientific-technical documentation Tracking of the booster during launch had to be accomplished through purely passive means such as visual coverage and radar detection. R-7 test launches demonstrated that the tracking cameras were only good up to an altitude of , but radar could track it for almost .

Outside the Soviet Union, the satellite was tracked by operators in many countries.Lovell, p. 196. The booster rocket was located and tracked by the British using the at the Jodrell Bank Observatory, the only telescope in the world able to do so by radar. Canada's Newbrook Observatory was the first facility in North America to photograph Sputnik 1.

The chief constructor of Sputnik 1 at OKB-1 was Mikhail S. Khomyakov. The satellite was a diameter sphere, assembled from two hemispheres that were sealed with and connected by 36 . It had a mass of . The hemispheres were 2 mm thick, and were covered with a highly polished 1 mm-thick made of an aluminium– , AMG6T. The satellite carried two pairs of antennas designed by the Antenna Laboratory of OKB-1, led by Mikhail V. Krayushkin. Each antenna was made up of two whip-like parts: in length, and had an almost spherical radiation pattern.

The , with a mass of , was in the shape of an octagonal nut with the radio transmitter in its hole.

(2019). 9785903389018, Foundation.
It consisted of three silver-zinc batteries, developed at the All-Union Research Institute of Power Sources (VNIIT) under the leadership of Nikolai S. Lidorenko. Two of these batteries powered the radio transmitter and one powered the temperature regulation system. The batteries had an expected lifetime of two weeks, and operated for 22 days. The power supply was turned on automatically at the moment of the satellite's separation from the second stage of the rocket.

The satellite had a one-watt, radio transmitting unit inside, developed by Vyacheslav I. Lappo from NII-885, the Moscow Electronics Research Institute, that worked on two frequencies, 20.005 and 40.002 MHz. Signals on the first frequency were transmitted in 0.3 sec pulses (under normal temperature and pressure conditions onboard), with pauses of the same duration filled by pulses on the second frequency. Form of Signals of the First Earth's Artificial Satellite – a document at the website of Russian state archive for scientific-technical documentation Analysis of the radio signals was used to gather information about the electron density of the ionosphere. Temperature and pressure were encoded in the duration of radio beeps. A temperature regulation system contained a fan, a dual , and a control thermal switch. If the temperature inside the satellite exceeded , the fan was turned on; when it fell below , the fan was turned off by the dual thermal switch. If the temperature exceeded or fell below , another control thermal switch was activated, changing the duration of the radio signal pulses. Sputnik 1 was filled with dry , pressurized to 1.3 atm. The satellite had a switch, activated if the pressure inside the satellite fell below 130 kPa, which would have indicated failure of the pressure vessel or puncture by a meteor, and would have changed the duration of radio signal impulse.

While attached to the rocket, Sputnik 1 was protected by a cone-shaped , with a height of . The fairing separated from both Sputnik and the spent R-7 second stage at the same time as the satellite was ejected. Tests of the satellite were conducted at OKB-1 under the leadership of .

Launch and mission
The control system of the Sputnik rocket was adjusted to an intended orbit of , with an orbital period of 101.5 min. Main Results of the Launch of the Rocket with the First ISZ Onboard on 4 October 1957 – document signed by S.P. Korolev, V.P. Glushko, N.A. Pilyugin and V.P. Barmin, in the book by Vetrov "Korolev and His Job" The trajectory had been calculated earlier by , using the USSR Academy of Sciences' mainframe computer.Siddiqi, p. 154.

The Sputnik rocket was launched on 4 October 1957 at 19:28:34  (5 October at the launch site) from Site No.1 at NIIP-5. Telemetry indicated that the strap-ons separated 116 seconds into the flight and the core stage engine shutdown 295.4 seconds into the flight. At shutdown, the 7.5-tonne core stage (with PS-1 attached) had attained an altitude of above sea level, a velocity of , and a velocity vector inclination to the local horizon of 0 degrees 24 minutes. This resulted in an initial orbit of by , with an apogee approximately lower than intended, and an inclination of 65.1 degrees and a period of 96.2 minutes.

A fuel regulator in the booster also failed around 16 seconds into launch, which resulted in excessive RP-1 consumption for most of the powered flight and the engine thrust being 4% above nominal. Core stage cutoff was intended for T+296 seconds, but the premature propellant depletion caused thrust termination to occur one second earlier when a sensor detected overspeed of the empty RP-1 turbopump. There were of remaining at cutoff.

At 19.9 seconds after engine cut-off, PS-1 separated from the second stage and the satellite's transmitter was activated. These signals were detected at the IP-1 station by Junior Engineer-Lieutenant V.G. Borisov, where reception of Sputnik 1's "beep-beep-beep" tones confirmed the satellite's successful deployment. Reception lasted for two minutes, until PS-1 fell below the horizon. How the First Sputnik Was Launched at Zemlya i Vselennaya magazine, No.5, 2002 The Tral telemetry system on the R-7 core stage continued to transmit and was detected on its second orbit.

The designers, engineers and technicians who developed the rocket and satellite watched the launch from the range. After the launch they drove to the mobile radio station to listen for signals from the satellite. They waited about 90 minutes to ensure that the satellite had made one orbit and was transmitting before Korolev called Soviet premier Nikita Khrushchev.Brzezinski, pp. 158–159.

On the first orbit the Telegraph Agency of the Soviet Union (TASS) transmitted: "As result of great, intense work of scientific institutes and design bureaus the first artificial Earth satellite has been built." The R-7 core stage, with a mass of 7.5 tonnes and a length of 26 meters, also reached Earth orbit. It was a first magnitude object following behind the satellite and visible at night. Deployable reflective panels were placed on the booster in order to increase its visibility for tracking. A small highly polished sphere, the satellite was barely visible at sixth magnitude, and thus harder to follow optically. The batteries ran out on 26 October 1957, after the satellite completed 326 orbits.

The core stage of the R-7 remained in orbit for two months until 2 December 1957, while Sputnik 1 orbited for three months, until 4 January 1958, having completed 1,440 orbits of the Earth.

The Soviets provided details of Sputnik 1 before the launch, but few outside the Soviet Union noticed. After reviewing information publicly available before the launch, the science writer wrote in 1958: Organized through the project Operation Moonwatch, teams of visual observers at 150 stations in the United States and other countries were alerted during the night to watch for the satellite at dawn and during the evening twilight as it passed overhead. The USSR requested amateur and professional radio operators to tape record the signal being transmitted from the satellite.

News reports at the time pointed out that "anyone possessing a short wave receiver can hear the new Russian earth satellite as it hurtles over this area of the globe."

(2019). 9780985485917, BookBaby. .
Directions, provided by the American Radio Relay League were to "Tune in 20 sharply, by the time signals, given on that frequency. Then tune to slightly higher frequencies. The 'beep, beep' sound of the satellite can be heard each time it rounds the globe.""How To Tune," San Antonio Light, 5 October 1957, p1 The first recording of Sputnik 1's signal was made by engineers near Riverhead, Long Island. They then drove the tape recording into Manhattan for broadcast to the public over radio. However, as Sputnik rose higher over the East Coast, its signal was picked up by W2AEE, the ham radio station of Columbia University. Students working in the university's FM station, , made a tape of this, and were the first to rebroadcast the Sputnik signal to the American public (or whoever could receive the FM station).

The Soviet Union agreed transmit on frequencies that worked with the United States' existing infrastructure, but later announced the lower frequencies. Asserting that the launch "did not come as a surprise", the refused to comment on any military aspects. On 5 October the Naval Research Laboratory captured recordings of Sputnik 1 during four crossings over the United States. The USAF Cambridge Research Center collaborated with , Westinghouse Broadcasting Co., and the Smithsonian Astrophysical Observatory to obtain a video of Sputnik's rocket body crossing the pre-dawn sky of Baltimore, broadcast on 12 October by in Boston.Ted Molczan, "Motion Picture of Sputnik 1 Rocket from Baltimore on October 12, 1957" , 30 June 2013.

The success of Sputnik 1 seemed to have changed minds around the world regarding a shift in power to the Soviets.

The 's launch of Sputnik 1 spurred the United States to create the (ARPA, later DARPA) in February 1958 to regain a technological lead. "Roads and Crossroads of Internet History" by Gregory Gromov

In Britain, the media and population initially reacted with a mixture of fear for the future, but also amazement about humankind's progress. Many newspapers and magazines heralded the arrival of the . However, when the Soviet Union launched a second craft, containing the dog , the media narrative returned to one of anti-communism and many people sent protests to the Russian embassy and the RSPCA.Nicholas Barnett '"Russia Wins Space Race"': The British Press and the Sputnik Moment, 1957': Media History, 19: 2 (2013), 182–195

Sputnik 1 was not immediately used for Soviet propaganda. The Soviets had kept quiet about their earlier accomplishments in rocketry, fearing that it would lead to secrets being revealed and failures being exploited by the West.Bessonov, K. (2007). Sputnik's legacy. Moscow News, 41. Retrieved from . When the Soviets began using Sputnik in their propaganda, they emphasized pride in the achievement of Soviet technology, arguing that it demonstrated the Soviets' superiority over the West. People were encouraged to listen to Sputnik signals on the radio and to look out for Sputnik in the night sky. While Sputnik itself had been highly polished, its small size made it barely visible to the naked eye. What most watchers actually saw was the much more visible 26-metre core stage of the R-7. Shortly after the launch of PS-1, Khrushchev pressed Korolev to launch another satellite to coincide with the 40th anniversary of the October Revolution, on 7 November 1957.Siddiqi, p. 172.
(2015). 9781493923625, Springer. .

The launch of Sputnik 1 surprised the American public and shattered the perception, furthered by American propaganda, of the United States as the technological superpower and the Soviet Union as a backward country. The Legacy of Sputnik Editorial. (2007). The New York Times, p. 28. Privately, however, the CIA and President Eisenhower were aware of progress being made by the Soviets on Sputnik from secret spy plane imagery. Together with the Jet Propulsion Laboratory (JPL), the Army Ballistic Missile Agency built Explorer 1, and launched it on 31 January 1958. Before work was completed, however, the Soviet Union launched a second satellite, Sputnik 2, on 3 November 1957. Meanwhile, the televised failure of Vanguard TV3 on 6 December 1957 deepened American dismay over the country's position in the . The Americans took a more aggressive stance in the emerging space race,Wilson, C. (n.d.). Sputnik: a Mixed Legacy. U.S. News & World Report, 143(12), (37–38). resulting in an emphasis on science and technological research, and reforms in many areas from the military to education systems. The federal government began investing in science, engineering, and mathematics at all levels of education. An advanced research group was assembled for military purposes. These research groups developed weapons such as ICBMs and missile defense systems, as well as spy satellites for the U.S.

Initially, U.S. President Eisenhower was not surprised by Sputnik 1. He had been forewarned of the R-7's capabilities by information derived from U-2 spy plane overflight photos, as well as signals and telemetry intercepts.Lashmar, p. 146.Peebles (2000), p. 168. The Eisenhower administration's first response was low-key and almost dismissive.Divine, p. xiv. Eisenhower was even pleased that the USSR, not the U.S., would be the first to test the waters of the still-uncertain .McDougall, p. 134. Eisenhower had suffered the Soviet protests and shoot-downs of (Moby Dick) balloonsPeebles (1991), p. 180. and was concerned about the probability of a U-2 being shot down.Burrows, p. 236. To set a precedent for "freedom of space" before the launch of America's secret WS-117L spy satellites,Peebles (1997), p. 26. the U.S. had launched as its own "civilian" satellite entry for the International Geophysical Year.McDougall, p. 118. Eisenhower greatly underestimated the reaction of the American public, who were shocked by the launch of Sputnik and by the televised failure of the Vanguard Test Vehicle 3 launch attempt. The sense of fear was inflamed by Democratic politicians and professional cold warriors, who portrayed the United States as woefully behind.Divine, p. xv. One of the many books that suddenly appeared for the lay-audience noted seven points of "impact" upon the nation: Western leadership, Western strategy and tactics, missile production, applied research, basic research, education, and democratic culture.

The U.S. soon had a number of successful satellites, including Explorer 1, , and Courier 1B. However, public reaction to the spurred America to action in the Space Race, leading to the creation of both the Advanced Research Projects Agency (renamed the Defense Advanced Research Projects Agency, or , in 1972),Brzezinski, p. 274. and (through the National Aeronautics and Space Act),McDougall, p. 172. as well as increased U.S. government spending on scientific research and education through the National Defense Education Act.

Sputnik also contributed directly to a new emphasis on science and technology in American schools. With a sense of urgency, Congress enacted the 1958 National Defense Education Act, which provided low-interest loans for college tuition to students majoring in math and science.Zhao, p. 22.Neal, et al, pp. 3–4. After the launch of Sputnik, a poll conducted and published by the University of Michigan showed that 26% of Americans surveyed thought that Russian sciences and engineering were superior to that of the United States. (A year later, however, that figure had dropped to 10% as the U.S. began launching its own satellites into space.)Project Mercury: Main-in-Space Program of NASA, Report of the Committee on Aeronautical Sciences, United States Senate, 1 December 1959

One consequence of the Sputnik shock was the perception of a "". This became a dominant issue in the 1960 Presidential campaign.Prados, p. 80.

One irony of the Sputnik event was the initially low-key response of the Soviet Union. The Communist Party newspaper only printed a few paragraphs about Sputnik 1 on 4 October.Harford, p. 121.

Sputnik also inspired a generation of engineers and scientists. Harrison Storms, the North American designer who was responsible for the X-15 rocket plane, and went on to head the effort to design the Apollo Command/Service Module and launch vehicle's second stage was moved by the launch of Sputnik to think of space as being the next step for America.Gray, p. 41. Astronauts (who was the first American in space) and later wrote of how the sight of Sputnik 1 passing overhead inspired them to their new careers.Shepard & Slayton, p. 43.

The launch of Sputnik 1 led to the resurgence of the suffix in the English language.

(2019). 9783823352105, Gunter Narr Verlag. .
(2001). 9780817311032, University of Alabama Press. .
The American writer was inspired to coin the term "" in an article about the in the San Francisco Chronicle on 2 April 1958.

The flag of the Russian city of , which, due to its importance as Konstantin Tsiolkovsky's birthplace, is very focused on space, features a small Sputnik in the left section.

Backup units and replicas
At least two vintage duplicates of Sputnik 1 exist, built apparently as backup units. One resides just outside Moscow in the corporate museum of Energia, the modern descendant of Korolev's design bureau, where it is on display by appointment only. Another is in the Museum of Flight in Seattle, Washington. Unlike Energia's unit, it has no internal components, but it does have casings and molded fittings inside (as well as evidence of battery wear), which suggest it was built as more than just a model. Authenticated by the Memorial Museum of Cosmonautics in Moscow, the unit was auctioned in 2001 and purchased by an anonymous private buyer, who donated it to the museum. Two more Sputnik backups are said to be in the personal collections of American entrepreneurs and Jay S. Walker.

In 1959, the Soviet Union donated a replica of Sputnik to the United Nations. There are other full-size Sputnik replicas (with varying degrees of accuracy) on display in locations around the world, including the National Air and Space Museum in the US, the Science Museum in England, the Powerhouse Museum in Australia, and outside the Russian embassy in Spain.

Three one-third scale student-built replicas of Sputnik 1 were deployed from the Mir space station between 1997 and 1999. The first, named Sputnik 40 to commemorate the fortieth anniversary of the launch of Sputnik 1, was deployed in November 1997. Sputnik 41 was launched a year later, and Sputnik 99 was deployed in February 1999. A fourth replica was launched, but never deployed, and was destroyed when Mir was deorbited.

See also
  • Donald B. Gillies – one of the first to calculate the Sputnik 1 orbit
  • – first computer to calculate the orbit of Sputnik 1
  • – one of the lead architects behind Sputnik 1
  • Timeline of artificial satellites and space probes
  • Timeline of Russian innovation
  • cosmonaut and first human to journey into


Further reading

Russian texts

External links

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