Venera 1 and Tyazhely Sputnik

Two small probes left Tyuratam eight days apart in February 1961, both built to hit Venus and put a Soviet emblem on it. Neither did. The first, 1VA No. 1, reached a low parking orbit on 4 February and stayed there, because the Blok L escape stage never ignited, and the Soviet press described the stranded stack only as a heavy satellite. The second, 1VA No. 2, fired out of orbit on 12 February and became the craft TASS and later histories call Venera 1. OKB-1's engineers heard it on launch day and again on 17 February; accounts of later contact disagree, and by early March it was lost for good. By their ballisticians' reckoning it drifted past Venus in May. This page covers both launches, the more ambitious 1V lander that OKB-1 dropped in the autumn of 1960 to make the window, and a third 1VA airframe that one catalogue lists and no other source consulted here mentions.

OKB-1's Venus work traces back to a government decree of 10 December 1959 on the development of space research. According to the RKK Energia corporate history, it started work on a rocket for flights to Mars and Venus and set February 1960 as the deadline for draft designs of the stations. G. Yu. Maksimov's sector in Department 9 spent that winter laying out the systems, down to a photo-television unit and instruments to look for signs of life. Korolev approved a schedule for the Venus station on 8 May 1960. What came out of it was called 1V, and it was a lander: by September 1960 the bureau had issued working drawings for a station that would deliver a descent vehicle shaped like a television tube to the surface of Venus, and Siddiqi's NASA chronology adds that it was to photograph the surface. By then, the Energia history says, it was plain that 1V could not be built before a window that ran from 15 January to 15 February 1961. So the decision, taken at the range, was to build the Venus station on the design parameters of the 1M Mars probe, then being readied for October, reusing most of its test campaign. The new station got the index 1VA, to set it apart from the 1V with its landing on Venus, and on 1 January 1961 it was sent to the range.

What flew was a pressurised cylinder with a dome on top. NSSDCA gives 2.035 m of height, 1.05 m of diameter and a fuelled mass of 643.5 kg, the figure in the Great Soviet Encyclopedia yearbook for 1961; McDowell's catalogue carries 620 kg. Two solar panels with about 2 square metres of cells stood out from the sides, a mesh dish more than 2 m across hung off one flank for the planned 8 and 32 cm links from Venus, and a 2.4 m omnidirectional rod was meant for the 1.6 m band; NSSDCA credits a separate T-shaped antenna with the 922.8 MHz downlink. A 1960 drawing now in the Russian State Archive of Scientific and Technical Documentation (RGANTD), from the papers of Korolev's colleague Arvid Pallo, labels 22 parts, among them the sensor for constant solar orientation, a fine Sun and star sensor, thermal-control louvres with their drive, spherical gas bottles for the attitude jets, a correction engine and an item marked simply 'pennant'. Here the sources part company. NSSDCA describes the dome as holding a sphere pressurised to 1.2 atmospheres that carried the pennant, and says the correction engine was not labelled in diagrams of the spacecraft; the archive drawing labels the dome as the engine's shield, item 5, and the engine itself as item 6. The science was modest: a three-axis fluxgate magnetometer by Sh. S. Dolginov of IZMIRAN on a 2 m boom, ion traps from K. I. Gringauz, micrometeorite detectors and cosmic-ray counters. Siddiqi's list adds infrared and ultraviolet spectrometers, which the archive's list leaves out.

Pride of place went to the pennant. The yearbook records a pennant bearing the State Emblem of the USSR; RGANTD says the designers fitted emblems in the hope they would reach the surface of a Venusian ocean, since many scientists then expected one (see Imagined Venus); NSSDCA says the sphere around them was designed to float; and a February 2026 anniversary piece on Pro Kosmos, prepared with RGANTD, calls the pennant titanium. A photograph in the Energia history, captioned as the pennants of Venera 1 and Venera 3, shows a disc dated 1961 with a diagram of planetary orbits, the Soviet coat of arms, and a small globe of the Earth. At breakfast after the launch, Chertok recalls, Korolev joked that only the pennant, which had heat protection, would ever reach the surface.

Just as new was the rocket. The 8K78, later called Molniya, stacked two new stages on the R-7: Blok I, adapted from the second stage of the R-9 missile with an engine from S. A. Kosberg's bureau, and Blok L, OKB-1's own escape stage. Blok L's S1.5400 engine was, the Energia history says, the first Soviet liquid engine to burn its turbine exhaust in the main chamber, giving about 7 tonnes of thrust and a vacuum specific impulse of 340 seconds from a titanium-alloy chamber. The hard part was timing. Blok L was built to light only after coasting in orbit, so it carried its own attitude control for the coast, a unit to ensure engine start in weightlessness (BOZ) and two small solid motors to give the stage an axial push. Starting Blok L in orbit, in weightlessness, was being tried for the first time, the history notes, and telemetry from the burn over the Gulf of Guinea reached the engineers only as late recordings from tracking ships, so some technical decisions were not quite correct and came late. The first two 8K78s, carrying 1M Mars probes on 10 and 14 October 1960, both failed in the third stage and never reached orbit.

Four days before launch the first 1VA nearly came to grief in the assembly building. Boris Chertok recalls that on 31 January, as the probe on its frame was being mated to the rocket, its attitude valves suddenly started firing and bleeding off nitrogen: the frame had flexed enough to trip the limit switches meant to start the first radio session after separation. Everyone on the erector jumped clear, because the probe's engine was already fuelled with nitric acid and kerosene. A fix, one switch blanked off and a wider stop and an electrical interlock on the other, was built overnight. On launch night it was minus 15 degrees, and tracking ships waited in the Gulf of Guinea, off Alexandria and in the Pacific. Launch came at 01:18:04 UT on 4 February (Siddiqi; McDowell's list has 01:18:03), which Kamanin's diary records as 4:18 Moscow time, two hours before sunrise. Three stages worked. Ussuriysk could not confirm that the fourth stage had separated, later reports were confused, and it soon became clear it would not leave for Venus.

Chertok chaired the inquiry, and it began as a quarrel between the rocket's control-system team, the power-supply designers and OKB-1's own engineers, whom Korolev had threatened to send back to Moscow along the railway sleepers if the fault was theirs. Telemetry plotted from the Kamchatka station settled it. At the end of the third-stage burn the PT-200, a rotating machine that converted current for Blok L's control system, had failed. Its designer, Iosifyan, learned it had been mounted on the truss between Blok I and Blok L, and protested that the machine was never rated for vacuum; its bearings or brushes had probably gone. Kamanin's diary gives the same verdict in a line, the fourth stage's converter had not been sealed, and records the only change made for the second launch: seal it. Sven Grahn's history of Jodrell Bank's tracking work describes the fault as a DC converter feeding the pyro timer, so that the start-support unit did not fire.

What to tell the world was argued two hours after the launch. Kamanin called the stranded stack 'the great mute', the largest satellite of the Earth at some 8 tonnes, unable to transmit because its antennas were still folded inside the fourth stage. Most of the commission, Kamanin included, wanted an immediate announcement, since foreign trackers would find the object anyway and might call it a spy satellite or, worse, a failed launch of a man; Korolev and others had doubts. Kamanin credits V. P. Glushko with the wording proposed: a new satellite put into orbit to rehearse the launch of a more powerful spacecraft. The Soviets gave its weight as 6,483 kg without separating probe from stage, and the papers called it Tyazhely sputnik, the heavy satellite. NSSDCA records that observers outside the USSR at first took it for a failed crewed flight. It circled at 212 by 318 km and re-entered on 26 February 1961. One more story about it rests on a single source: Andrew LePage writes that two years later a boy found debris from it, including the commemorative disc, near the River Baryusha in Siberia. None of the Russian accounts read for this page mentions that find.

At 7 a.m. on 11 February the second rocket rolled out, and the testers, Chertok writes, knocked on wood: it was the fourth 8K78, and surely the fourth would work. It lifted off at 00:34:36 UT on 12 February by McDowell's reckoning; Siddiqi has 00:34:38, and Kamanin's diary 3:34:25, which read as Moscow time is 00:34:25 UT. NSSDCA's trajectory page gives 02:09 UT and Chertok's memoir 7:04:35, and neither fits the others. This time, Chertok says, all four stages worked normally. The stack reached a parking orbit of about 229 by 282 km at 65.7 degrees (NSSDCA), rounded the Earth, and over equatorial Africa Blok L fired, which the Energia history calls the first departure toward Venus anywhere in the world. McDowell logs the start-support unit separating at 01:34 UT and the probe at 01:38 UT, and carries the spent Blok L in the same orbit around the Sun as the probe.

At 9:17 by Chertok's clock the NIP-16 station at Yevpatoria in Crimea reported the first deep-space session going normally, and a second at 16:23 confirmed the probe was really on its way to Venus. The ballistics centre said a correction would be needed and that, if it worked, the Soviet pennant would reach the planet. Then Yevpatoria reported trouble. Telemetry showed the constant solar orientation mode, which kept the panels on the Sun to charge the batteries, running unsteadily. On such a fault the station's logic turned it back to the Sun, spun it about its Sun-pointing axis for coarse gyroscopic stability and switched off every consumer except thermal control and the programme timer. Chertok calls the result a piece of stupidity committed at the design stage: the command receivers went off with everything else, so the ground could not call the probe, and the next session would come only from the onboard timer, five days later. TASS, unaware of this, announced the launch of the interplanetary station Venera-1, its bulletin closing with the claim that the flight laid the first interplanetary route to the planets. Chertok has TASS using the name at once; Siddiqi writes that it was applied retroactively many years later.

Despite a rush at the range to prepare a Vostok test flight with a dummy and dogs, Korolev and Keldysh flew to Yevpatoria with the whole Venus team for the session of 17 February. In the small hall at NIP-16, where field telephones were the main source of news, someone reported a signal; the room applauded until Korolev glared it quiet. The Soviet yearbook for 1961 puts the probe 1,889,000 km from Earth at 14:04 Moscow time that day, over the Indian Ocean and receding at 3,923 m/s, and says the solar orientation system worked steadily. Chertok's memoir contradicts that last point: the controllers risked testing the solar mode again during the session, and it failed again. According to NSSDCA the probe reported 29 degrees C and a pressure of 900 mm inside the dome, and the instruments returned data. A message from Alla Massevitch to Jodrell Bank timed the session at 14:04 to 15:35 Moscow time. The yearbook also places the probe 488,900 km out at noon on 13 February, which NSSDCA counts as a session, although Chertok describes five days without contact.

After that the accounts diverge. Chertok writes that the probe did not come up on 22 February. The yearbook says only that contact could not be made on 27 February. The Energia history says the station answered commands until 22 February and counts a two-way link with a station 1,400,000 km away as a world first. NSSDCA reports the bureau's claim of commands acknowledged at 3.2 million km on 22 February, 'fadeouts' on the 27th and a failed call at 7.5 million km on 4 March. The RGANTD article and the 2026 Pro Kosmos piece give 19 February as the last session. The dates measure different things: the last session with telemetry, a claimed command acknowledgement, or the day a scheduled call failed. After heated argument Pravda printed an unsigned description of the flight on 26 February, with a photograph of the spherical pennant and no word that contact had been lost.

A second inquiry under Chertok, with Raushenbakh, Khodarev and Ostashev among its members, found the orientation fault quickly. The optical sensor for constant solar orientation was not sealed, and the thermal engineers had checked only the average temperature of the whole instrument; calculations showed its sensing element could pass 80 degrees C, which, he writes, unambiguously caused the failure. The loss of contact took longer to argue and was put down to the programme timer, which had been built into the radio complex to save mass. Korolev rebuked Chertok sharply for that concession, and later stations carried timers of the bureau's own design, made at the Plastik plant. The lasting rule was simpler: never switch the command receivers off again. Siddiqi's account leans harder on heat, saying the probe shut its communications down because of higher-than-normal temperatures after its mechanical thermal shutters failed. The Energia history, in one sentence, links thermal-control disturbances to the orientation problems and says they forced every session through the omnidirectional antenna.

Moscow kept listening. According to Grahn's history, published by the observatory, Soviet trackers computed that the probe would pass closest to Venus on 17 May 1961 and asked Jodrell Bank to try for its telemetry then. The British telescope picked up unidentified signals on 922.8 MHz that day and sent them to Moscow; nothing came of them. Bernard Lovell invited Massevitch and Khodarev by telegram on 30 May, and they spent 9 to 16 June at the observatory trying again, without result. The last telegram of pointing data from Moscow that Grahn found in the observatory's Venus probe file is dated 20 June 1961.

Nobody saw the pass itself. NSSDCA and Siddiqi give 19 to 20 May 1961 and within or about 100,000 km, a figure the RGANTD article repeats; NSSDCA's trajectory table puts closest approach at 16.5 Venus radii, about 100,000 km at its 6,052 km radius, on 20 May. Chertok says the ballisticians reckoned about 100,000 km at the end of May, and the date given to Jodrell Bank at the time was 17 May. McDowell's heliocentric catalogue then carries the probe and its Blok L in an orbit of 0.718 by 1.019 astronomical units inclined 0.58 degrees, and dates the pass to 20 May with a query mark; NSSDCA gives 0.72 by 1.02 AU and a period of 311.1 days. A pass that distant marks no point on the planet, so Venera 1 has no globe pin.

Of the science that came back, little is in the published record. NSSDCA's entry for Dolginov's magnetometer, with a range of plus or minus 50 gammas per axis, says only limited results were obtained during a short transmission period en route and no flyby results have been presented in the literature. Siddiqi writes that the 17 February session returned data on interplanetary magnetic fields, cosmic rays and solar plasma, and that Venera 1 data helped detect plasma flow in deep space. RGANTD goes further, saying the flight confirmed the presence of solar-wind plasma and gave its parameters near the Earth and at about two million kilometres. No paper publishing Venera 1 values was located for this page, so how much the ion traps added cannot be judged here.

A third airframe appears in one place. Gunter's Space Page lists '1VA #3' as not launched. Siddiqi's chronology, McDowell's catalogue, NSSDCA and the Energia history know only two 1VA stations, and neither Chertok nor Kamanin, in the passages read for this page, mentions a third. It remains a lead until a document turns up.

Out of the failure came a new programme. In early February 1961, at the range, Korolev decided on a unified station for Mars and Venus; the initial data for the 2MV series were ready by 30 July, and by early 1962 working drawings for four versions, including a Venus lander and a Venus flyby craft, had gone to the factory. Blok L kept failing. Only in 1964, the Energia history says, was the root cause found: a design error meant power for the stage's attitude system was not switched over as intended 70 seconds before ignition, leaving the stage uncontrolled for those 70 seconds. When the disturbances stayed small the engine lit anyway, and the history names 1VA among the flights that got away with it. The error took 15 minutes to fix. Of 19 interplanetary launches OKB-1 made, the same history counts only two as successful, and at the end of 1965 the work passed to the Lavochkin bureau under G. N. Babakin. The road ran through Zond 1 and Venera 2 and 3 to Venera 4. The American attempts of 1962 are on Mariner 1 and 2.