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1964 40) Atlas booster separation and left the system Ranger 6 inoperable. The cameras were to have trans- Nation: U.S. (17) mitted high-resolution photos of the lunar Objective(s): lunar impact approach from 1,448 kilometers to 6.4 kilo- Spacecraft: P-53 / Ranger-A meters range in support of Project Apollo. Spacecraft Mass: 364.69 kg Impact coordinates were 9°24' north latitude Mission Design and Management: NASA JPL and 21°30' east longitude. Launch Vehicle: Atlas-Agena B (no. 8 / Atlas D no. 199 / Agena B no. 6008) 41) Launch Date and Time: 30 January 1964 / no name / [Zond] 15:49:09 UT Nation: USSR (24) Launch Site: ETR / launch complex 12 Objective(s): Venus flyby Scientific Instruments: Spacecraft: 3MV-1A (no. 4A) 1) imaging system (six TV cameras) Spacecraft Mass: c. 800 kg Results: This fourth American attempt at Mission Design and Management: OKB-1 lunar impact was the closest success. The Launch Vehicle: 8K78 (no. T15000-19) spacecraft, the first Block III type vehicle Launch Date and Time: 19 February 1964 / with a suite of six TV cameras, was sterilized 05:47:40 UT to avoid contaminating the lunar surface. The Launch Site: NIIP-5 / launch site 1 series would also serve as a test bed for Scientific Instruments: future interplanetary spacecraft by deploying 1) radiation detector systems (such as solar panels) that could be 2) charged-particle detector used for more ambitious missions. The Block 3) magnetometer III spacecraft carried a 173-kilogram TV unit 4) piezoelectric detector (replacing the impact capsule carried on the 5) atomic hydrogen detector Block II Ranger spacecraft). The six cameras 6) radio telescope included two full-scan and four partial-scan 7) ultraviolet and Roentgen solar radi- cameras. Ranger 6 flew to the Moon success- ation experiment fully and impacted precisely on schedule at 8) technology experiment 09:24:32 UT on 2 February. Unfortunately, the 9) plasma engines power supply for the TV camera package had Results: This was another Soviet “third- short-circuited three days previously during generation” deep space probe that failed to 1964 41 accomplish its mission of a Venus flyby. This Lander: spacecraft failed to reach Earth orbit due to a 1) barometer malfunction in the launch vehicle’s third 2) thermometer stage. Later investigation indicated that a 3) radiation detector liquid oxygen leak through an unpressurized 4) micro-organism detection experiment valve seal froze propellant in the main 5) atmospheric composition experiment pipeline. As a result, the pipeline cracked, 6) acidity measurement experiment leading to an explosion in the third stage. 7) electro-conductivity experiment 8) luminosity experiment 42) Results: The probe, designed to accomplish no name / [Luna] atmospheric entry into Venus, successfully Nation: USSR (25) reached Earth orbit but failed to leave for Objective(s): lunar soft-landing Venus when the Blok L upper stage malfunc- Spacecraft: Ye-6 (no. 6) tioned. The upper stage evidently lost stable Spacecraft Mass: c. 1,420 kg attitude due to a failure in the circuit of the Mission Design and Management: OKB-1 power supply for the attitude-control system. Launch Vehicle: 8K78M (no. T15000-20) The spacecraft burned up in Earth’s atmos- Launch Date and Time: 21 March 1964 / phere the following day. Had this mission been 08:15:35 UT successful, it would probably have been given Launch Site: NIIP-5 / launch site 1 a Zond designation. Scientific Instruments: 1) imaging system 44) 2) radiation detector Zond 1 Results: This fourth Soviet attempt to achieve a Nation: USSR (27) soft-landing on the Moon failed to reach an Objective(s): Venus impact intermediate orbit around Earth. During the Spacecraft: 3MV-1 (no. 4) boost phase, the launcher’s third-stage Spacecraft Mass: 948 kg engine’s main liquid oxygen valve failed to Mission Design and Management: OKB-1 open when the valve rod broke off. As a result, Launch Vehicle: 8K78 (no. T15000-23) the third-stage engine never reached full Launch Date and Time: 2 April 1964 / thrust and eventually cut off prematurely at 02:42:40 UT T+489 seconds. The spacecraft never reached Launch Site: NIIP-5 / launch site 1 Earth orbit. Scientific Instruments: Bus: 43) 1) radiation detector Kosmos 27 / [Zond] 2) charged-particle detector Nation: USSR (26) 3) magnetometer Objective(s): Venus impact 4) piezoelectric detector Spacecraft: 3MV-1 (no. 5) 5) atomic hydrogen detector Spacecraft Mass: 948 kg Lander: Mission Design and Management: OKB-1 1) barometer Launch Vehicle: 8K78 (no. T15000-22) 2) thermometer Launch Date and Time: 27 March 1964 / 3) radiation detector 03:24:42 UT 4) micro-organism detection experiment Launch Site: NIIP-5 / launch site 1 5) atmospheric composition experiment Scientific Instruments: 6) acidity measurement experiment Bus: 7) electro-conductivity experiment 1) radiation detector 8) luminosity experiment 2) charged-particle detector Results: Although this Venus impact probe was 3) magnetometer successfully sent toward Venus, ground con- 4) piezoelectric detector trollers discovered a series of major malfunc- 5) atomic hydrogen detector tions in the spacecraft during its coast to the planet. These included depressurization of the 42 Deep Space Chronicle main spacecraft bus when the glass cover of a Launch Date and Time: 28 July 1964 / solar-stellar attitude-control sensor cracked. 16:50:07 UT Additionally, the internal radio transmitters of Launch Site: ETR / launch complex 12 the spacecraft were automatically switched on Scientific Instruments: at the wrong time—during depressurization, 1) imaging system (six TV cameras) when the gas discharge created high-voltage Results: Ranger 7, the second of the Block III currents that shorted out the system. Contact Ranger series, was the first unequivocal suc- was maintained with the still-pressurized 290- cess in U.S. efforts to explore the Moon—after kilogram lander module until 25 May 1964, by thirteen consecutive failures. In some ways, it which time controllers had managed to conduct marked a major milestone in American deep two major course corrections (at 560,000 kilo- space exploration because the ratio in favor of meters and 13 to 14 million kilometers from successes increased dramatically after this Earth, respectively), the first time such actions point. After a nominal midcourse correction had been performed on a Soviet interplanetary on 29 July, Ranger 7 approached the Moon spacecraft. The inert spacecraft eventually flew precisely on target two days later. Just 15 by Venus on 19 July 1964 at a range of 110,000 minutes prior to impact, the suite of TV cam- kilometers. The Soviets later published some eras began sending back spectacular photos data on cosmic-ray flux measured by Zond 1. of the approaching surface to JPL’s Goldstone dish in California. The last of 4,316 images 45) was transmitted only 2.3 seconds prior to no name / [Luna] impact at 13:25:49 UT on 31 July 1964. The Nation: USSR (28) impact point was at 10°38' south latitude and Objective(s): lunar soft-landing 20°36' west longitude on the northern rim of Spacecraft: Ye-6 (no. 5) the Sea of Clouds. Scientists on the ground Spacecraft Mass: c. 1,420 kg were more than satisfied with Results; image Mission Design and Management: OKB-1 resolution was, in many cases, one thousand Launch Vehicle: 8K78M (no. T15000-21) times better than photos taken from Earth. Launch Date and Time: 20 April 1964 / Scientists concluded that an Apollo crewed 08:08:28 UT landing would be possible in the mare regions Launch Site: NIIP-5 / launch site 1 of the lunar surface, given their relative Scientific Instruments: smoothness. 1) imaging system 2) radiation detector 47) Results: This was the fifth Soviet attempt at a Mariner 3 lunar soft-landing. The mission was aborted Nation: U.S. (19) early when during the ascent to Earth orbit, Objective(s): Mars flyby the launch vehicle’s third-stage engine pre- Spacecraft: Mariner-64C / Mariner-C maturely shut down. A subsequent investiga- Spacecraft Mass: 260.8 kg tion indicated that the engine cut off due to Mission Design and Management: NASA JPL loss of power when a circuit between a bat- Launch Vehicle: Atlas-Agena D (no. 11 / Atlas tery in the fourth stage (which powered the D no. 289 / Agena D no. AD68/6931) third-stage engine) and the I-100 guidance Launch Date and Time: 5 November 1964 / unit was broken. 19:22:05 UT Launch Site: ETR / launch complex 13 46) Scientific Instruments: Ranger 7 1) imaging system Nation: U.S. (18) 2) cosmic dust detector Objective(s): lunar impact 3) cosmic-ray telescope Spacecraft: P-54 / Ranger-B 4) ionization chamber Spacecraft Mass: 365.6 kg 5) magnetometer Mission Design and Management: NASA JPL 6) trapped radiation detector Launch Vehicle: Atlas-Agena B (no. 9 / Atlas D 7) solar plasma probe no. 250 / Agena B no. 6009) 8) occultation experiment 1964 43 Results: NASA approved two probes for the Mariner-Mars 1964 project in November 1962. The primary goal of the two spacecraft was to photograph the Martian surface using a single TV camera fixed on a scan platform that could return up to twenty-one pictures after an eight-month journey. During the launch of Mariner 3, the first of the two probes, the booster payload shroud failed to separate from the payload. Additionally, battery power mys- teriously dropped to zero (at T+8 hours 43 minutes), and the spacecraft’s solar panels apparently never unfurled to replenish the power supply. As a result, ground control lost contact with the spacecraft, which eventually entered heliocentric orbit. A later investiga- Eleventh picture of Mars from Mariner 4 (in “raw” state) tion indicated that the shroud’s inner fiber- taken through the green filter from 12,500 kilometers glass layer had separated from the shroud’s away, showing a crater 121 kilometers in diameter in the outer skin, thus preventing jettisoning.

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