Home 1958 Summary
1957 spacecrafts 1959 spacecrafts
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The 28 spacecrafts launched in 1958:
1) Explorer 1 2) Vanguard TV-3bu 3) Explorer 2 4) Vanguard I
5) Explorer 3 6) "Sputnik" 7) Vanguard TV-5 8) Sputnik 3
9) Vanguard SLV-1 10) Vanguard SLV-2 11) NOTS 1 12) Explorer 4
13) NOTS 2 14) Able 1 / "Pioneer 0" 15) NOTS 3 16) Explorer 5
17) NOTS 4 18) NOTS 5 19) NOTS 6 20) "Luna"
21) Vanguard SLV-3 22) Able 2 / Pîoneer 1 23) "Luna" 24) Beacon 1
25) Able 3 / Pioneer 2 26) "Luna" 27) Pioneer 3 28) Score
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Spacecraft Entries
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Explorer 1
Spacecraft: 
Chronologies: 1958 payload #1 ; 1958-001A ; 4th spacecraft.
Type: Easth/space science
Families 3rd science & technology satellite (2nd American)
Rank: 4th civilian spacecraft (2nd American) ; 2nd American spacecraft (2nd civilian satellite)
Sponsor: U.S. AMBA / Army Ballistic Missile Agency
Launch: 1st February 1958 at 3h48 UTC, from Cape Canaveral Air Force Station's LC-26A, by a Jupiter C (RTV 4, Juno I C 29 (IE), RS-29).
Orbit: 356 km x 2 548 km x 33,2° x 114,8 min.
Decayed: 31 May 1970
Mission: First successful US orbital launch, Explorer 1 was developed by the Jet Propulsion Laboratory and carried the U.S.-IGY (International Geophysical Year) experiment of James A. Van Allen for the study of cosmic rays, micrometeorites, and for monitoring of the satellite's temperature. It carried a single Geiger-Mueller detector (to detect cosmic rays), micrometeorite detection was accomplished using both a wire grid (arrayed around the aft section of the rocket body) and an acoustic detector (placed in contact with the midsection).  On-orbit dry mass: 13.97 kg (4.82 kg instrumentation package). Explorer 1 transmitted until 23 May 1958.
     Explorer 1discovered Van Allen radiation belts around Earth that durably trapped radiation in the Earth's magnetosphere, dubbed the Van Allen Radiation Belt after the principal investigator of the cosmic ray experiment on Explorer 1. It is one of the most important discovery of the Space Era. 
Notes: Explorer 1 was launched on a modified Army Ballistic Missile Agency (AMBA) Jupiter-C, on 31 January 1958 at 22h48 p.m. EST (local time), or 3h48 UTC on 1st February.
Naming the first
U.S.
satellite: 
The Jet Propulsion Laboratory, responsible for the fourth stage of the Jupiter C rocket and for the satellite, had called the effort "Project Deal" (a loser in a poker game always called for a new deal -- and this satellite was the answer to the Russian Sputnik). On the day of the launch, ABMA proposed the name "Top Kick," which
was not considered appropriate. The list of names was brought out again. All the names on the list had been crossed out and only the heading "Explorers" remained. The late Richard Hirsch, a member of the National Security Council's Ad Hoc Committee for Outer Space, suggested that the first American satellite be called simply "Explorer." The name was accepted and announced by the Secretary of the Army Wilbur M. Brucker, It indicated she mission of this first satellite: to explore the unknown.
 Source: Jonathan Space Report's Master List ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's 1958-001A ; TRW Space Log ;  Vanguard, A History (NASA SP-4202) Chapter 12 & Explorer Flight Summary ; Origins of NASA Names (NASA SP-4402) Chapter 2 p. 49-50 ;
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Vanguard TV-3bu
Spacecraft:  Vanguard Test Satellite Backup
Chronologies: 1958 payload #2 ; 1958 1st loss ; 5th spacecraft.
Type: Technology
Families: 3rd technology satellite (2nd American) ; 2nd failure.
Ranks: 5th civilian spacecraft (3rd American) ; 3rd American spacecraft (3rd civilian satellite)
Sponsor: U.S. NRL / Naval Research Laboratory
Launch: 5 February 1958 at 7h33 UTC, from Cape Canaveral Air Force Station's LC-18A, by a Vanguard (TV-3BU).
Orbit: None
Mission: Trial firing of IGY Vanguard (TV-3Bu) satellite. Control lost after 57 seconds; control system malfunction. Mass: 1.35 kg.
Source: Jonathan Space Report's VAGT3B ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:VAGT3B ; TRW Space Log ; Vanguard, A History (NASA SP-4202) Chapter 12 ;
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Explorer 2
Spacecraft: 
Chronologies: 1958 payload #3 ; 1958 2nd loss ; 6th spacecraft.
Type: Easth/space science
Families: 4th science satellite (3rd American) ; 3rd failure.
Ranks: 6th civilian spacecraft (4th American) ; 4th American spacecraft (4th civilian satellite)
Sponsor: U.S. AMBA / Army Ballistic Missile Agency
Launch: 5 March 1958 at 18h28 UTC, from Cape Canaveral Air Force Station's LC-26A, by a Jupiter C (RTV 5, Juno I C 26 (UV), RS/CC-26).
Orbit: None
Mission: Explorer 2 was similar to Explorer 1. It failed to orbit when the fourth stage of the rocket failed to ignite. On-orbit dry mass: 14.52 kg (mass: 5 kg).
Source: Jonathan Space Report's EXPLR2 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:EXPLR2 ; TRW Space Log ; Vanguard: A History's Explorer Flight Summary ;
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Vanguard I
Spacecraft:  Vanguard 1C / Vanguard Test Satellite
Chronologies: 1958 payload #4 ; 1958-002A ; 7th spacecraft.
Type: Easth/space science
Families: 5th science  satellite (4th American)
Ranks: 7th civilian spacecraft (5th American) ; 5th American spacecraft (5th civilian satellite)
Sponsor: U.S. NRL / Naval Research Laboratory
Launch: 17 March 1958 at 12h16 UTC, from Cape Canaveral Air Force Station's LC-18A, by a Vanguard (TV-4).
Orbit: 658 km x 3 968 km x 34,35° x 134,18 min.
Decayed The oldest satellite in orbit.
Mission: Vanguard 1 was a small satellite designed to test the launch capabilities of a three-stage launch vehicle and the effects of the environment on asatellite and its systems in Earth orbit. It also was used to obtain geodetic measurements through orbit analysis. The spacecraft was a 1.47-kg aluminum sphere 15.2 cm in diameter. It contained a mercury-battery powered transmitter and a transmitter powered by six solar cells mounted on the body of the satellite. Six short aerials protruded from the sphere. The transmitters were used primarily for engineering and tracking data, but were also used to determine the total electron content between the satellite and ground stations. Vanguard also carried two thermistors which measured the interior temperature over 16 days in order to track the effectiveness of the thermal protection. The battery-powered transmitter stopped operating in June 1958 when the batteries ran down. The solar powered transmitter operated until May 1964. On 17  March 1971, Vanguard I completed third year in orbit and was still transmitting. It provided much useful data on orbits, including the slight pear-shape of the Earth and the effect of solar pressure.
     On 17 March 1963, the fifth anniversary of its orbiting, Vanguard I was still transmitting data. The satellite had made more than 19,700 orbits and had slowed about 1/4 sec. from original 134 min., 27 sec. period. Present apogee: 3,937 km; perigee: 648 km. Scientists estimated Vanguard I might have a lifetime of 2,000 years. After six years in orbit (1964), Vanguard I was the only satellite orbited before 1959 that was still transmitting.
Notes: Original estimates had the orbit of Vanguard will last for 2000 years. But it was discovered that solar radiation pressure and atmospheric drag during high levels of solar activity produced significant perturbations in the perigee height of the satellite, which caused a significant decrease in its expected lifetime to only about 240 years.
Source: Jonathan Space Report's 1958-002B ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:1958-002B ; TRW Space Log ; Vanguard, A History (NASA SP-4202) Chapter 12 ; NASA, Aeronautical and Astronautical Events of 1961, p.10  ;  ;Aeronautical and Astronautical Events of 1963, p. 96-7 ; Astronautical Events of 1964, p. 107 ; 
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Explorer 3
Spacecraft: 
Chronologies: 1958 payload #5 ; 1958-003A ; 8th spacecraft.
Type: Easth/space science
Families: 6th science satellite (5th American)
Ranks: 8th civilian spacecraft (6th American) ; 6th American spacecraft (6th civilian satellite)
Sponsor: U.S. AMBA / Army Ballistic Missile Agency
Launch: 26 March 1958 at 17h38 UTC, from Cape Canaveral Air Force Station's LC-5, by a Jupiter C (RTV 6, Juno I - C 24 (UT), RS-24).
Orbit: 186 km x 2 799 km x 33,38° x 115,7 min.
Decayed: 28 June 1958
Mission: Explorer III was almost identical to Explorer II. Scientific instrumentation added to data acquired by Explorer I
Source: Jonathan Space Report's 1958-003A ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:1958-003A ; TRW Space Log ; Vanguard: A History's Explorer Flight Summary ;
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"Sputnik"
Spacecraft:  D-1 no. 1 / Object D or D-1
Chronologies: 1958 payload #6 ; 1958 3rd loss ; 9th spacecraft.
Type: Easth/space science
Families: 7th science satellite (2nd Soviet) ; 4th failure.
Ranks: 9th civilian spacecraft (3rd Soviet) ; 3rd Soviet spacecraft (3rd civilian satellite)
Sponsor: Soviet Union (Korolev's Desing Bureau)
Launch: 27 April 1958, from Baykonur Cosmodrome's LC-1, by an A/"Sputnik" (8A91 B1-2).
Orbit: None.
Mission: The first truly "scientific" satellite to be orbited by the Soviet Union; it was supposed to have been launched first in 1957, but when this spacecraft tooke longer than planned to be built, it was replaced by two simpler ones. This 1 250-kg spacecraft was dedicated to study Earth's magnetosphere.  It was lost when the launch vehicle disintegrated 88 seconds after liftoff.
     The breadth and number of scientific instruments on board the spacecraft was literally a jolt to Western scientists: the 1,327-kilogram observatory made out of aluminum alloy carried twelve scientific experiments on board. The useful payload of the sophisticated scientific observatory was 968 kilograms, and its scientific program was supported by 7 team of scientists from various discipline, 
     Object D was launched by a modified R-7 ICBM named the 8A91, but the launch vehicle broke up into pieces 96.5 seconds after liftoff because of resonant frequencies, thus destroying two and a half years' worth of labor.
Notes: Object D (or D-1) was so named because it would be the fifth type of payload to be carried on an R-7. Objects A, B, V, and G were designations for different nuclear warhead containers. The satellite was a complex scientific laboratory, far more sophisticated than anything planned for launch in the world in 1956. Object D had originall been slated to be the first Soviet satellite; having been usurped from its place by the smaller PS-1 and PS-2 spacecraft, it was the last Soviet space project in existence at the time. 
Source: Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ; TRW Space Log ; Asif Siddiqi, Challenge To Apollo, p. 151, 176 ; 
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Vanguard TV-5
Spacecraft:  Vanguard 2A X-ray/environmental satellite
Chronologies: 1958 payload #7 ; 1958 4th loss ; 10th spacecraft.
Type: Easth/space science
Families: 8th science satellite (6th American) ; 5th failure.
Ranks: 10th civilian spacecraft (7th American) ; 7th American spacecraft (7th civilian satellite)
Sponsor: U.S. NRL / Naval Research Laboratory
Launch: 29 April 1958 at 2h53 UTC, from Cape Canaveral Air Force Station's LC-18A, by a Vanguard (TV-5).
Orbit: None
Mission: Failed to orbit when the third stage of the rocket failed to ignite. Mass: 1 kg.
Source: Jonathan Space Report's VAGT5 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:VAGT5 ; TRW Space Log ; Vanguard, A History (NASA SP-4202) Chapter 12 ;
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Sputnik 3
Spacecraft:  D-1 no. 2 / 3-y Sovetskiy ISZ
Chronologies: 1958 payload #8 ; 1958-004A ; 11th spacecraft.
Type: Easth/space science
Families: 9th science satellite (3rd Soviet)
Ranks: 11th civilian spacecraft (4th Soviet) ; 4th Soviet spacecraft (4th civilian satellite)
Sponsor: Soviet Union
Launch: 15 May 1958 at 7h12 UTC, from Baykonur Cosmodrome's LC-1, by an A/"Sputnik" (8A91 B1-1).
Orbit: 226 km x 1 881 km x 65,2° x 105,95 min.
Decayed: 6 April 1960
Mission: Replaced the Sputnik losted in April. Sputnik 3 was an automatic scientific laboratory. It was conically-shaped and was 3.57 meter long with a mass of 1,327 kg. The scientific instrumentation (twelve instruments) provided data on pressure and composition of the upper atmosphere, concentration of charged particles, photons in cosmic rays, heavy nuclei in cosmic rays, magnetic and electrostatic fields, and meteoric particles. The outer radiation belts of the Earth were detected during the flight. 
     This spacecraft was an identical backup article or Object D, with the same instrument complement. The Soviet press referred to it  as the "Third Artificial Satellit,", later retroactively naming it "Sputnik 3". Prior to launch, there was reportedly some doubt about the functioning capabilities of the Tral-D data recorder but Korolev, under pressure from Khrushchev to launch the satellite in time to show support for the Italian Communist Party in the Italian elections, opted to launch without verifying the operation of the device in question. During the flight, ground controllers discovered that the data recorder did indeed fail, thus depriving scientists of information during periods when the satellite was not within communications view of ground stations. This had a repercussive effect on preventing scientists from confirming without doubt the existence of a radiation belt around Earth, there was simply no way to prove that the belt was continuous because of gaps in data. Despite the serious failure, there were 100,000 telemetric measurements and 40,000 optical observations conducted until communication was lost with the spacecraft on 3 June 1958. The mission provided a substantial amount of scientific and technological data in various disciplines. Object D decayed from orbit on 6 April 1960, leaving behind the record of having been the first advanced scientific observatory launched into space.
Notes: On 25 February 1962, Soviet scientists claimed to have discovered the third radiation belt around the Earth and published such findings two years before the findings of Explorer XII were made public by NASA on January 19, 1962. Academician Blagonravov, Vice President of the International Committee on Space Research, said in an Izvestia interview that the existence of a dense belt with energies of 200 to 20,000 electron volts at a distance of 40,000 to 80,000 km was recorded by Soviet space launchings in 1958. Such findings, he said, were published by Dr. K. Gringauz and associates in the February and April issues of the Soviet Academy of Sciences Proceedings in 1960, and in later publications. Commenting on the view that the three radiation belts really formed a single large pulsating band that might be called a imagnetosphere, Blagonravov agreed that the boundaries might be arbitrary but that the charged particles in each belt had distinctive characteristics and that it would be inexpedient to reject the theory of three belts. 
Source: Jonathan Space Report's 1958-004B ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:1958-004B ; TRW Space Log ;; Asif Siddiqi, Challenge To Apollo, p. 175-6 ;Aeronautics and Astronautics, 1962, p. 22 
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Vanguard SLV-1
Spacecraft:  Vanguard 2B / Lyman Alpha satellite
Chronologies: 1958 payload #9 ; 1958 5th loss ; 12th spacecraft.
Type: Easth/space science
Families: 10th science satellite (7th American) ; 6th failure.
Ranks: 12th civilian spacecraft (8th American) ; 8th American spacecraft (8th civilian satellite)
Sponsor: U.S. NRL / Naval Research Laboratory
Launch: 28 May 1958 at 3h46 UTC, from Cape Canaveral Air Force Station's LC-18A, by a Vanguard (SLV-1).
Orbit: None
Mission: Failed to orbit as improper 3rd stage trajectory (unknown cause). Mass: 9.8 kg.
Source: Jonathan Space Report's VAGLS1 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:VAGSL1 ; TRW Space Log ; Vanguard, A History (NASA SP-4202) Chapter 12 ;
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Vanguard SLV-2
Spacecraft:  Vanguard 2C / Lyman Alpha satellite
Chronologies: 1958 payload #10 ; 1958 6th loss ; 13th spacecraft.
Type: Easth/space science
Families: 11th science satellite (8th American) ; 7th failure ;
Ranks: 13th civilian spacecraft (9th American) ; 9th American spacecraft (9th civilian satellite)
Sponsor: U.S. NRL / Naval Research Laboratory
Launch: 26 June 1958 at 5h01 UTC, from Cape Canaveral Air Force Station's LC-18, by a Vanguard (SLV-2).
Orbit: None
Mission: Loss following premature seconnd stage cutoff.  Mass: 10 kg.
Source: Jonathan Space Report's VAGLS2 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:VAGSL2 ; TRW Space Log ; Vanguard, A History (NASA SP-4202) Chapter 12 ;
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NOTS 1 / Pilot 1
Spacecraft:  Diagnostic Payload 1/ Pilot no. 1
Chronologies: 1958 payload #11 ; 1958 7th loss ; 14th spacecraft.
Type: Technology
Families: 1st military science & technology satellite (1st American) ; 8th failure.
Ranks: 1st military spacecraft (1st American) : 10th American spacecraft (1st military satellite)
Sponsor: U.S. Navy
Launch: 25 July 1958, from Inyokern / China Lake, by a NOTS-SLV (no. 1).
Orbit: ?
Mission: Radio contact lost; possibly reached orbit.
Notes: The NOTS program was an air-launched satellite system and anti-satellite versions, tested shortly after Sputnik. The project competed with the Army's Jupiter-C, the Air Force Atlas and the civilian Vanguard. It comprized 10 missions: 4 suborbital R&D flights and six "Pilot" orbital tries, all of which ending in failure.
Source: Jonathan Space Report's Master List ; Mark Wade’s Encyclopedia Astronautica NOTS
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Explorer 4
Spacecraft:  Explorer B
Chronologies: 1958 payload #12 ; 1958-005A ; 15th spacecraft.
Type: Easth/space science
Families: 12th science satellite (9th American) ; 11th American spacecraft (10th civilian satellite)
Ransk: 14th civilian spacecraft (10th American) ;
Sponsor: U.S, DARPA
Launch: 26 July 1958 at 15h07 UTC, from Cape Canaveral Air Force Station's LC-5, by a Jupiter C (RTV 7, Juno I C 44 (TT), RS/CC-44).
Orbit: 257 km x 1 352 km x 50,2° x 100,9 min.
Decayed: 23 October 1959
Mission: Explorer IV carrying two Geiger-Mueller counters, two scintillation counters, and internal temperature measurements transmitted by sub-carrier center frequency shift. The spacecraft was a cylindrically shaped satellite instrumented to make the first detailed measurements of charged particles (protons and electrons) trapped in the terrestrial radiation belts. It explored a far greater volume of space as regards latitude and altitude than Explorers I and III. Collected data on trapped electrons resulting from Argus high-altitude nuclear explosions.
    An unexpected tumble motion of the satellite made the interpretation of the detector data very difficult. The low-power transmitter and the plastic scintillator detector failed on 3 September 1958. The two Geiger-Mueller tubes and the cesium iodide crystal detectors continued to operate normally until 19 September 1958. The high-power transmitter ceased sending signals on 5 October 1958. It is believed that exhaustion of the power batteries caused these failures. The spacecraft decayed from orbit after 454 days .On-orbit dry mass: 25.50 kg 
Source: Jonathan Space Report's 1958-005A ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:1958-005A ; TRW Space Log ; Vanguard: A History's Explorer Flight Summary ;
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NOTS 2 / Pilot 2
Spacecraft:  Diagnostic Payload 2 / Pilot no. 2
Chronologies: 1958 payload #13 ; 1958 8th loss ; 16th spacecraft.
Type: Technology
Families: 2nd military science & technology satellite (2nd American) ; 9th failure.
Ranks: 2nd military spacecraft (2nd American) : 12th American spacecraft (2nd military satellite)
Sponsor: U.S. Navy
Launch: 12 August 1958, from Inyokern / China Lake, by a NOTS-SLV.
Orbit: None
Mission: Vehicle exploded at ignition.
Source: Jonathan Space Report's Master List ; Mark Wade’s Encyclopedia Astronautica NOTS ;
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 Able 1 / "Pioneer 0"
Spacecraft:  See note below on Pioneer naming (in Pioneer 1 entry).
Chronologies: 1958 payload #14 ; 1958 9th loss ; 17th spacecraft.
Type: Lunar probe
Families: 1st planetary probe (1st American) ; 10th failure.
Ranks: 14th civilian spacecraft (11th American) ; 13th American spacecraft (11th civilian satellite)
Sponsor: U.S. Air Force
Launch: 17 August 1958 at 12b18 UTC, from Cape Canaveral Air Force Station's LC-17A, by a Thor-Able (Thor 127 / Able 1).
Orbit: None.
Mission: First lunar attempt: the 37.8-kg Pioneer 0 probe was designed to go into orbit around the Moon. It carried a TV camera and other instruments as part of the first International Geophysical Year (IGY) science payload. The spacecraft was destroyed by an explosion of the first (Thor booster) stage 77 seconds after launch at 16 km altitude, 16 km downrange over the Atlantic. Failure was suspected to be due to a ruptured fuel or oxygen line. Erratic telemetry signals were received from the probe and upper stages for 123 seconds after the explosion. Thor exploded after 17 seconds. (Spacecraft Mass: 38 kg.)
Origins:
Source: Jonathan Space Report's ABLE1 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:ABLE1 ; TRW Space Log ; A. Siddiqi, SP-2002-4524, p. 17 ;
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NOTS 3 / Pilot 3
Spacecraft:  Diagnostic Payload 3 / Pilot no. 3
Chronologies: 1958 payload #15 ; 1958 10th loss ; 18th spacecraft.
Type: Technology
Families: 3rd military science & technology satellite (3rd American) ; 11th failure.
Ranks: 3rd military spacecraft (3rd American) : 14th American spacecraft (3rd military satellite)
Sponsor: U.S. Navy
Launch: 22 August 1958, from Inyokern / China Lake, by a NOTS-SLV.
Orbit: ?
Mission: Radio contact lost; possibly reached orbit.
Source: Jonathan Space Report's Master List ; Mark Wade’s Encyclopedia Astronautica NOTS ;
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Explorer 5
Spacecraft: 
Chronologies: 1958 payload #16 ; 1958 11th loss ; 19th spacecraft.
Type: Easth/space science
Families: 13th science satellite (10th American) ; 12th failure.
Ranks: 16th civilian spacecraft (12th American) ; 15th American spacecraft (12th civilian satellite)
Sponsor: U.S. DARPA
Launch: 24 August 1958 at 6h17 UTC, from Cape Canaveral Air Force Station's LC-5, by a Jupiter C (RTV 8, Juno I C 47 (TI), RS/CC-47).
Orbit: None.
Mission: Explorer V, with a mass of 17.24 kg, is a duplicate of Explorer IV. It failed to orbit at, at the first-stage separation, this stage collided with upper stages. Second Stage ignited in wrong direction. Flight time: 659 seconds. 
Source: Jonathan Space Report's EXPLR5 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:EXPLR5 ; TRW Space Log ; Vanguard: A History's Explorer Flight Summary ;
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NOTS 4 / Pilot 4
Spacecraft:  Radiation Payload 1 / Pilot no. 4
Chronologies: 1958 payload #17 ; 1958 12th loss ; 20th spacecraft.
Type: Technology
Families: 4th military science & technology satellite (4th American) ; 13th failure.
Ranks: 4th military spacecraft (4th American) : 16th American spacecraft (4th military satellite)
Sponsor: U.S. Navy
Launch: 25 August 1958, from Inyokern / China Lake, by a NOTS-SLV.
Orbit: None.
Mission: Vehicle exploded after 0.75 second..
Source: Mark Wade’s Encyclopedia Astronautica NOTS ;
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NOTS 5 / Pilot 5
Spacecraft:  Radiation Payload 2 / Pilot no. 5
Chronologies: 1958 payload #18 ; 1958 13th loss ; 21st spacecraft.
Type: Technology
Families: 5th military science & technology satellite (5th American) ; 14th failure.
Ranks: 5th military spacecraft (5th American) : 17th American spacecraft (5th military satellite)
Sponsor: U.S. Navy
Launch: 26 August 1958, from Inyokern / China Lake, by a NOTS-SLV.
Orbit: None.
Mission: Stage failed to ignite, vehicle fell into Pacific.
Source: Mark Wade’s Encyclopedia Astronautica NOTS ;
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NOTS 6 / Pilot 6
Spacecraft:  Radiation Payload 3 / Pilot no. 6
Chronologies: 1958 payload #19 ; 1958 14th loss ; 22nd spacecraft.
Type: Technology
Families: 6th military science & technology satellite (6th American) ; 15th failure.
Ranks: 6th military spacecraft (6th American) : 18th American spacecraft (6th military satellite)
Sponsor: U.S. Navy
Launch: 28 August 1958, from Inyokern / China Lake, by a NOTS-SLV.
Orbit: None.
Mission: One first stage motor failed to ignite, causing structural failure.
Source: Mark Wade’s Encyclopedia Astronautica NOTS ;
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"Luna"
Spacecraft:  Ye-1 no. 1 (E-1 no. 1)
Chronologies: 1958 payload #20 ; 1958 15th loss ; 23rd spacecraft.
Type: Lunar probe
Families: 2nd planetary probe (1st Soviet) ; 16th failure.
Ranks: 16th civilian spacecraft (5th Soviet) ; 5th Soviet spacecraft (5th civilian satellite)
Sponsor: Soviet Union (Korolev's Design Bureau)
Launch: 23 September 1958 at 9h03 UTC, from Baykonur Cosmodrome's LC-1, by an A-1/"Vostok"  (8K72 B1-3).
Orbit: None.
Mission: This early Luna launch was believed to be an attempt to reach the Moon and impact on its surface. It was a simple probe, a pressurized spherical object made from aluminum-magnesium alloy, approximately the size of the first Sputnik, that carried five scientific instruments. The goals of the mission were to study the gas component of interplanetary matter (using the proton traps), meteoric particles and photons in cosmic radiation (using the piezoelectric detectors), the magnetic fields of the Moon and Earth (using the magnetometer), variations in cosmic ray intensity, and heavy nuclei in primary cosmic radiation. The probe (on its upper stage) also carried one kilogram of natrium to create an artificial comet on the outbound trajectory that could be photographed from Earth. Spacecraft Mass: ~360 kg (with upper stage).
      During the launch, the booster developed longitudinal resonant vibrations on the strap-on boosters of the launch vehicle. The rocket eventually disintegrated at T+93 seconds, destroying its payload. 
     According to Bart Hendrickx, this first Luna launch attempt take place a month after the Pioneer failure. But, had Pioneer 0 been successfully launched, the Russians would have made their first attempt the following day. When Korolyov learned of US plans to launch the first Pioneer on 17 August, he moved his first Luna launch to the day after. Since the Soviet probe would fly a shorter trajectory, it would reach the Moon prior to Pioneer. When the Pioneer launch failed, Korolyov decided to play it safe and roll the rocket back to the assembly building. There had been problems with the R-7 main engines as well as other malfunctions during pre-launch preparations. The R-7 was returned to the pad in mid-September but failed 87 seconds into flight.
Origins: The Soviet government approved a modest plan for initial exploration of the Moon in March 1958. Engineers conceived of four initial probes: the Ye-1 (for lunar impact), Ye-2 (to photograph the far side of the Moon), Ye-3 (to photograph the far side of the Moon) and Ye-4 (for lunar impact with a nuclear explosion).
Source: Jonathan Space Report's Master List ; Mark Wade’s Encyclopedia Astronautica ; TRW Space Log ; A. Siddiqi, SP-2002-4524, p. 17-8 ; Bart Hendrickx, "Friends and Partners in Space" newgroups, 19 August 1998.
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Vanguard SLV-3
Spacecraft:  Vanguard 2D / Cloud cover satellite
Chronologies: 1958 payload #21 ; 1958 16th loss ; 24th spacecraft.
Type: Easth/space science
Families: 14th science satellite (11th American) ; 17th failure.
Ranks: 17th civilian spacecraft (12th American) ; 19th American spacecraft (13th civilian satellite)
Sponsor: U.S. NRL / Naval Research Laboratory
Launch: 26 September 1958 at 15h38 UTC, from Cape Canaveral Air Force Station's LC-18A, by a Vanguard (SLV-3).
Orbit: None.
Mission: mass: 9.98 kg. Insufficient second stage thrust (for unknown cause).
Source: Jonathan Space Report's VAGLS3 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:VAGSL3 ; TRW Space Log ; Vanguard, A History (NASA SP-4202) Chapter 12 ;
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Able 2 / Pioneer 1
Spacecraft:  This mission, Able 2, has been retroactively known as Pioneer 1.
Chronologies: 1958 payload #22 ; 1958-006A ; 25th spacecraft.
Type: Lunar probe
Families: 3rd planetary probe (2nd American)
Ranks: 18th civilian spacecraft (13th American) ; 20th American spacecraft (14th civilian satellite)
Sponsor: U.S. Air Force/NASA
Launch: 11 October 1958 at 8h42 UTC, from Cape Canaveral Air Force Station's LC-17A, by a Thor Able (Thor 130 / Able 1).
Orbit: Ballistic trajectory, up to 113,800 km from Earth.
Decayed: 13 October 1958 at 3h46 UTC over the South Pacific Ocean after 43 hours of flight.
Mission: The second and most successful of three project Able space probes. The The 34.20-kg spacecraft was very similar in design to the Able 1 probe. It was intended to study the ionizing radiation, cosmic rays, magnetic fields and micrometeorites in the vicinity of the Earth and in lunar orbit.
     During the mission, the Thor second stage shut down 10 seconds early due to incorrect information from an accelerometer measuring incremental velocity. The launch vehicle thus imparted insufficient velocity for the probe to escape the Earth’s gravity. An attempt to insert the spacecraft into high-Earth orbit at 32,200 x 128,700 kilometers by using its retromotor failed because internal temperatures had fallen too much for the batteries to provide adequate power. The probe did, however, reach an altitude of 115,400 kilometers by 11h42 UTC, verifying the existence of the Van Allen belts and returning other useful data before reentering 43 hours 17 minutes after launch. 
     Partial failure: a small quantity of useful scientific information was returned, showing the radiation surrounding Earth was in the form of bands and measuring the extent of the bands, mapping the total ionizing flux, making the first observations of hydromagnetic oscillations of the magnetic field, and taking the first measurements of the density of micrometeorites and the interplanetary magnetic field.
Notes: Although the USAF actually conducted the mission, this was the first U. S.  space mission under the aegis of the recently formed National Aeronautics and Space Administration. The probe was developed by Space Technology Laboratories, Inc. and was launched for NASA by the Air Force Ballistic Missile Division (AFBMD).
Pioneer name: "Pioneer" was chosen as the name for the first U.S. space probe: Pioneer 1 as well as for the following series of lunar and deep space probes. The Pioneer series had been initiated for the International Geophysical Year by the Department of Defense's Advanced Research Projects Agency (ARPA), which assigned execution variously to the Air Force Ballistic Missile Division (AFBMD) and to the Army Ballistic Missile Agency (ABMA).
     Credit for naming the first probe has been attributed to Stephen A. Saliga, who had been assigned to the Air Force Orientation Group, Wright-Patterson AFB, as chief designer of Air Force exhibits. While he was at a briefing, the spacecraft was described to him as a "lunar-orbiting vehicle with an infrared scanning device." Saliga thought the title too long and lacked theme for an exhibit design. He suggested "Pioneer" as the name of the probe since "the Army had already launched and orbited the Explorer satellite and their Public Information Office was identifying the Army as 'Pioneers in Space,'" and by adopting the name the Air Force would "make a 'quantum jump' as to who really [were] the 'Pioneers in space.'"
Source: Jonathan Space Report's 1958-007A ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:1958-007A ; TRW Space Log ; A. Siddiqi, SP-2002-4524, p. 18 ; Origins of NASA Names (NASA SP-4402) Chapter 3 p. 88-89 ;
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"Luna"
Spacecraft:  Ye-1 no. 2 (E-1 no. 2)
Chronologies: 1958 payload #23 ; 1958 17th loss ; 26th spacecraft.
Type: Lunar probe
Families: 4th planetary probe (2nd Soviet) ; 18th failure.
Ranks: 19th civilian spacecraft (6th Soviet) ; 6th Soviet spacecraft (6th civilian satellite)
Sponsor: Soviet Union (Korolev's Design Bureau)
Launch: 11 October 1958 at 23h42 UTC, from Baykonur Cosmodrome's LC-1, by an A-1/"Vostok" (8K72 B1-4).
Orbit: None.
Mission: This early Luna launch was believed to be an attempt to reach the Moon and impact on its surface. The second attempt to impact the Moon (after Luna) failed when, again, the probe never left Earth’s atmosphere. The launch vehicle exploded after 104 seconds due to longitudinal resonant vibrations in the strap-on boosters. (Spacecraft Mass: ~360 kg (with upper stage).)
Note: This mission was launched a few hours after the Pioneer 1 mission. Because Luna was on a faster trajectory, it would have reached the Moon first.
Source: Mark Wade’s Encyclopedia Astronautica ; TRW Space Log ;; A. Siddiqi, SP-2002-4524, p. 18 ;
Beacon 1
Spacecraft: 
Chronologies: 1958 payload #24 ; 1958 18th loss ; 27th spacecraft.
Type: Easth/space science
Families; 15th science satellite (12th American) ; 19th failure.
Ranks: 20th civilian spacecraft (14th American) ; 21st American spacecraft (15th civilian satellite)
Sponsor: NASA/U.S. Army
Launch: 23 October 1958 at 3h22 UTC, from Cape Canaveral Air Force Station's LC-5, by a Jupiter C (RTV 9, Juno I C 49 (TE), RS/CC-49).
Orbit: None.
Mission: Beacon 1 was a thin plastic sphere (3,6-meter in diameter after inflation) launched to study atmospheric density at various levels. This 4-kg high-visibility balloon was also to serve as a radar target. But the rocket's upper stages and the payload separated prior to first-stage burnout, thus the mission was a failure. Rotational spin vibrations of the cluster caused the payload to drop off at 112 seconds and structural failure after 149 seconds. 
Source: Jonathan Space Report's BEAC1 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:BEAC1 ; TRW Space Log ; Vanguard: A History's Explorer Flight Summary ;
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Able 3 / Pioneer 2
Spacecraft: 
Chronologies: 1958 payload #25 ; 1958 19th loss ; 28th spacecraft.
Type: Lunar probe
Families: 5th planetary probe (3rd American) ; 20th failure.
Ranks: 21st civilian spacecraft (15th American) ; 22nd American spacecraft (16th civilian satellite)
Sponsor: U.S. Air Force & NASA
Launch: 8 November 1958 at 7h30 UTC, from Cape Canaveral Air Force Station's LC-17A, by a Thor Able (Thor 129 / Able 1).
Orbit: None.
Mission: This lunar probe was developed by USAF's Space Technology Laboratories, Inc. and was launched for NASA by the Air Force Ballistic Missile Division (AFBMD). The 39. 6 kg probe included a new TV scanner and a new type of battery, as well as a new cosmic-ray telescope to study the Cherenkov Effect. For this third Air Force launch of a lunar orbiter, engineers introduced a number of changes to the Thor-Able launcher. Like its predecessors, Pioneer 2 never reached its target. A signal from the ground shut down the Thor launch vehicle’s stage 2 earlier than planned. Additionally, when the X-248 third-stage engine separated, it failed to fire. As a result, the probe burned up in Earth’s atmosphere only 45 minutes after launch. During its brief mission, it reached an altitude of 1,550 kilometers and sent back data that suggested that Earth’s equatorial region had higher flux and energy levels than previously thought. The information also indicated that micrometeoroid density was higher near Earth than in space. Investigators concluded that the third-stage engine had failed to fire because of a broken wire.
Source: Jonathan Space Report's PION2 ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:PION2 ; TRW Space Log ; A. Siddiqi, SP-2002-4524, p. 18-9 ; Origins of NASA Names (NASA SP-4402) Chapter 3 p. 88-89 ;
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"Luna"
Spacecraft:  Ye-1 no. 3 (E-1 no. 3)
Chronologies: 1958 payload #26 ; 1958 20th loss ; 29th spacecraft.
Type: Lunar probe
Families: 6th planetary probe (3rd Soviet) ; 21st failure.
Ranks: 22nd civilian spacecraft (7th Soviet) ; 7th Soviet spacecraft (7th civilian satellite)
Sponsor: Soviet Union (Korolev's Design Bureau)
Launch: 4 December 1958 at 18h19 UTC, from Baykonur Cosmodrome's LC-1, by an A-1/"Vostok" (8K72 B1-5).
Orbit: None.
Mission: This mission was the third failure in a row in Soviet attempts to send a Ye-1 lunar impact probe to the Moon. The thrust level of the core engine of the R-7 booster dropped abruptly at T+245 seconds, leading eventually to premature engine cutoff. The payload never reached escape velocity. (Spacecraft Mass: ~360 kg (with upper stage).
Source: Mark Wade’s Encyclopedia Astronautica ; TRW Space Log ; A. Siddiqi, SP-2002-4524, p. 19 ;
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Pioneer 3
Spacecraft: 
Chronologies: 1958 payload #27 ; 1958 21st loss ; 30th spacecraft.
Type: Lunar probe
Families: 7th planetary probe (4th American) ; 22nd failure.
Ranks: 23nd civilian spacecraft (16th American) ; 23th American spacecraft (17th civilian satellite)
Sponsor: NASA & AMBA
Launch: 6 December 1958 at 5h45 UTC, from Cape Canaveral Air Force Station's LC-05, by a Juno II (RTV 10, AM-1 [or AM-11?]).
Orbit: Ballistic trajectory up to 102,322 km
Dacayed: 7 December 1958 at 16h51 UTC.
Mission: Pioneer 3 was the first of two U. S. Army launches to the Moon: it was developed by the Jet Propulsion Laboratory and launched for NASA by the Army Ballistic Missile Agency (ABMA). The 5.87 kg probe was a spin-stabilized craft (up to 700 rpm) whose primary goal was to fly by the Moon. Two special 0.21-ounce weights were to spin out on 1.5-meter wires and reduce spin to 12 rpm once the mission was under way. The spacecraft carried an optical sensor to test a future imaging system. If the sensor received, from a source such as the Moon, a collimated beam of light that was wide enough to pass through a lens and fall simultaneously on two photocells, then the sensor would send a signal to switch on an imaging system (not carried on this spacecraft). The launch failed as the main booster engine shut down 4 seconds earlier than planned due to propellant depletion. Once put on its trajectory, Pioneer 3 was about 1,030 kilometers per hour short of escape velocity. It eventually reached 102,322 kilometers and burned up over Africa 38 hours 6 minutes after launch. The spacecraft contributed to the major scientific discovery of dual bands of radiation around Earth. 
Source: Jonathan Space Report's 1958-008A ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's ID:1958-008A ; TRW Space Log ; A. Siddiqi, SP-2002-4524, p. 19 ; Origins of NASA Names (NASA SP-4402) Chapter 3 p. 88-89 ;
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Score
Spacecraft:  Signal Communication by Orbiting Relay Equipment
Chronologies: 1958 payload #28 ; 1958-007A ; 31st spacecraft.
Type: Technology
Families:
Ranks: 7th military spacecraft (7th American) : 24th American spacecraft (7th military satellite)
Sponsor: U.S. Army
Launch: 18 December 1958 at 23h02 UTC, from Cape Canaveral Air Force Station's LC-11, by an Atlas B (10B).
Orbit:
Mission: This US Army satellite was an 80-ft long, 10-ft diam Atlas missile used as a platform for the communications relay experiment. The spacecraft body served as antennae. This satellite was to demonstrate the feasibility of, and explore problems associated with, operation of a satellite communication system. It carried messages on a tape recorder which was used at one point to carry a Christmas greeting from President Eisenhower. This was the first voice transmission from space which was broadcast from on December 18, 1958. The performance was nominal with experiment operation for 12 days, planned orbit lifetime 20 days, actual orbit lifetime 35 days.
Source: Jonathan Space Report's 1958-006A ; Mark Wade’s Encyclopedia Astronautica ; National Space Science Data Center's 1958-006A ;  NASA, Aeronautical and Astronautical Events of 1962, p. 117 ;
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© Claude Lafleur, 2004-10 Mes sites web: claudelafleur.qc.ca