Engineering:Zond 3

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Short description: 1965 Soviet moon probe
Zond 3
Zond 2.jpg
Mission typeLunar science
OperatorOKB-1
COSPAR ID1965-056A
SATCAT no.01454
Mission duration228 days
Spacecraft properties
Spacecraft type3MV-4
ManufacturerOKB-1
Launch mass950 kg (2,090 lb)[1]
Start of mission
Launch dateJuly 18, 1965, 14:32 (1965-07-18UTC14:32) UTC[1]
RocketMolniya SL-6/A-2-e
Launch siteBaikonur LC-1/5
End of mission
Last contactMarch 3, 1966 (1966-03-04)[2]
Orbital parameters
Reference systemHeliocentric
Eccentricity0.2683
Perihelion altitude0.9 AU (130 million km)
Aphelion altitude1.56 AU (233 million km)
Inclination0.5°
Period500 days
EpochJuly 19, 1965, 20:00 UTC[3]
Flyby of Moon
Closest approachJuly 20, 1965
Distance9,219 km (5,728 mi)
← Zond 2
None →
 

Zond 3 was a 1965 space probe which performed a flyby of the Moon's far side,[4] taking a number of quality photographs for its time. It was a member of the Soviet Zond program while also being part of the Mars 3MV project. It was unrelated to Zond spacecraft designed for crewed circumlunar missions (Soyuz 7K-L1). It is believed that Zond 3 was initially designed as a companion spacecraft to Zond 2 to be launched to Mars during the 1964 launch window. The opportunity to launch was missed, and the spacecraft was launched on a Mars-crossing trajectory as a spacecraft test, even though Mars was no longer attainable.

Spacecraft design

The spacecraft was of the 3MV-4 type, similar to Zond 2.[2] In addition to a 106.4 mm focal length f/8 imaging system for visible light photography and ultraviolet spectrometry at 285-355 μm, it carried ultraviolet (190-275 μm) and infrared (3-4 μm) spectrophotometers, radiation sensors (gas-discharge and scintillation counters), charged particle detector, magnetometer, and micrometeoroid detector.[2][5] It also had an experimental ion engine.

Operational history

Zond 3 was launched from Baikonur Cosmodrome on July 18, 1965, at 14:38 UTC, and was deployed from a Tyazhely Sputnik (65-056B) Earth-orbiting platform towards the Moon and interplanetary space. This was a repeat of a mission that failed in late 1963 intended to test communication at distances equivalent to the distances experienced by Mars and Earth.[6]

Zond 3's lunar flyby occurred on July 20 with a closest approach of 9,219 km (5,728 mi),[2] approximately 35 hours after launch. 25 visible light photographs and 3 ultraviolet spectra of very good quality were taken of the lunar surface, beginning at 01:24 UTC and 11,570 km (7,190 mi) prior to closest approach and ending at 02:32 UTC and 9,960 km (6,190 mi) past closest approach, covering a period of 68 minutes.[2][7] The photos covered 19 million km2 (7.3 million sq mi) of the lunar surface.[8]

Zond 3 proceeded on a trajectory across Mars' orbit, but not at a time when planetary encounter would occur. These images were transmitted by radio frequency on July 29 at a distance of 2.25 million km (1.40 million mi). To test telemetry, the camera film was rewound and retransmitted in mid-August, mid-September, and finally on October 23 at a distance of 31.5 million km (19.6 million mi), thus proving the ability of the communications system.[2] The subsequent transmissions were also at progressively slower data rates but higher quality.[6] The mission was ended after radio contact ceased on March 3, 1966, when it was at a distance of 153.5 million km (95.4 million mi).[2][5] It operated for 228 days, roughly equivalent to the time needed to survive a journey to Mars and exceeding that needed for Venus.[2]

References

  1. ↑ 1.0 1.1 Siddiqi, Asif (2018). Beyond Earth: A Chronicle of Deep Space Exploration, 1958–2016 (second ed.). NASA History Program Office. https://www.nasa.gov/sites/default/files/atoms/files/beyond-earth-tagged.pdf. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 LePage, Andrew J. (July 27, 2015). "The mission of Zond 3". The Space Review. http://www.thespacereview.com/article/2794/1. 
  3. ↑ "Zond 3 – Trajectory Details". NASA Space Science Data Coordinated Archive. NASA. https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1965-056A. 
  4. ↑ Harvey, Brian (August 17, 2007). Soviet and Russian Lunar Exploration. Springer Science+Business Media. p. 82. ISBN 978-0-387-73976-2. https://books.google.com/books?id=nVeY7vMCtOkC&pg=PA82. 
  5. ↑ 5.0 5.1 Huntress, Wesley T. Jr.; Marov, Mikhail Ya. (2011). Soviet Robots in the Solar System: Mission Technologies and Discoveries. Springer-Praxis Books in Space Exploration. Springer Science+Business Media. pp. 130–132. doi:10.1007/978-1-4419-7898-1. ISBN 978-1-4419-7897-4. https://books.google.com/books?id=rgl_C0XrKTUC&pg=PA130. 
  6. ↑ 6.0 6.1 Teitel, Amy Shira (July 18, 2013). "Zond 3: First to See Moon's Far Side on the Way to Mars". Discovery News. http://news.discovery.com/space/history-of-space/zond-3-saw-the-moons-far-side-on-its-way-to-mars-130718.htm. 
  7. ↑ Siddiqi, Asif A. (June 2002). Deep Space Chronicle: A Chronology of Deep Space and Planetary Probes 1958–2000. Monographs in Aerospace History. 24. NASA. pp. 49–50. SP-2002-4524. ISBN 0-16-067405-0. https://solarsystem.nasa.gov/resources/298/deep-space-chronicle-a-chronology-of-deep-space-and-planetary-probes-1958-2000/. 
  8. ↑ "Zond 3 - Details". NASA Space Science Data Coordinated Archive. NASA. https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1965-056A. 

External links


Preceded by
Zond 2 		Zond program Succeeded by
None



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