| 词条 | Venera 2MV-1 No.2 |
| 释义 |
| name = 2MV-1 No.2 | image = Venera 1962 diagramm.jpg | image_caption = Diagramm of the Sputnik 20 | mission_type = Venus lander | operator = OKB-1 | Harvard_designation = 1962 Alpha Tau 1 | COSPAR_ID = 1962-043A | SATCAT = 381 | mission_duration = Launch failure | spacecraft_type = 2MV-1 | manufacturer = OKB-1 | dry_mass = | launch_mass = {{convert|6500|kg|lb|abbr=on}} | power = | launch_date = {{start-date|1 September 1962, 02:12:30|timezone=yes}} UTC | launch_rocket = Molniya 8K78 {{nowrap|s/n T103-13}} | launch_site = Baikonur 1/5 | launch_contractor = | decay_date = {{end-date|6 September 1962}} | orbit_epoch = {{start-date|1 September 1962}} | orbit_reference = Geocentric | orbit_regime = Low Earth (achieved) Heliocentric (intended) | orbit_periapsis = {{convert|180|km|mi}} | orbit_apoapsis = {{convert|310|km|mi}} | orbit_eccentricity = 0.00981 | orbit_inclination = 64.9 degrees | orbit_period = 89.4 minutes | apsis = gee | programme = Venera | previous_mission = Venera 2MV-1 No.1 | next_mission = Venera 2MV-2 No.1 }}Venera 2MV-1 No.2,[1][2] also known as Sputnik 20 in the Western world, was a Soviet spacecraft, which was launched in 1962 as part of the Venera programme, and was intended to become the first spacecraft to land on Venus.[1] Due to a problem with its upper stage it failed to leave low Earth orbit, and reentered the atmosphere a few days later.[2] It was the second of two Venera 2MV-1 spacecraft, both of which failed to leave Earth orbit. The previous mission, Venera 2MV-1 No.1, was launched several days earlier.[3] Venera 2MV-1 No.2 was launched at 02:12:30 UTC on 1 September 1962, atop a Molniya 8K78 carrier rocket flying from Site 1/5 at the Baikonur Cosmodrome.[4] The lower stages of the rocket operated nominally, injecting the fourth stage and payload into a low Earth orbit. Following a coast phase, the upper stage was to have ignited around sixty-one minutes and thirty seconds after launch, in order to place the spacecraft into heliocentric orbit. The ignition command did not reach the engine however, and the fuel valves did not open, so the upper stage failed to ignite leaving the payload in geocentric orbit.[5] It reentered the atmosphere on 6 September 1962, five days after it had been launched.[6] The designations Sputnik 24, and later Sputnik 20 were used by the United States Naval Space Command to identify the spacecraft in its Satellite Situation Summary documents, since the Soviet Union did not release the internal designations of its spacecraft at that time, and had not assigned it an official name due to its failure to depart Earth orbit.[1][7] [8]See also{{Portal|Spaceflight}}
References1. ^1 {{cite web|url=http://www.russianspaceweb.com/spacecraft_planetary_venus.html|title=Russia's unmanned missions to Venus|last=Zak|first=Anatoly|publisher=RussianSpaecWeb|accessdate=28 July 2010}} {{Venera}}{{Orbital launches in 1962}}{{USSR-spacecraft-stub}}2. ^{{cite web|url=http://www.astronautix.com/project/venera.htm|title=Venera|last=Wade|first=Mark|publisher=Encyclopedia Astronautica|accessdate=28 July 2010|deadurl=yes|archiveurl=https://www.webcitation.org/65WvOr2K9?url=http://www.astronautix.com/project/venera.htm|archivedate=17 February 2012|df=}} 3. ^1 {{cite web|url=http://space.skyrocket.de/doc_sdat/venera-2mv-1.htm|title=Venera (2a), (2b) (2MV-1 #1, 2)|first=Gunter|last=Krebs|publisher=Gunter's Space Page|accessdate=28 July 2010}} 4. ^1 {{cite web|url=http://planet4589.org/space/log/launchlog.txt|title=Launch Log|last=McDowell|first=Jonathan|publisher=Jonathan's Space Page|accessdate=28 July 2010}} 5. ^{{cite web|url=http://www.astronautix.com/lvs/soyuz.htm|title=Soyuz|last=Wade|first=Mark|publisher=Encyclopedia Astronautica|accessdate=28 July 2010|deadurl=yes|archiveurl=https://www.webcitation.org/5mqiUXlX2?url=http://www.astronautix.com/lvs/soyuz.htm|archivedate=17 January 2010|df=}} 6. ^{{cite web|url=http://planet4589.org/space/log/satcat.txt|title=Satellite Catalog|last=McDowell|first=Jonathan|publisher=Jonathan's Space Page|accessdate=28 July 2010}} 7. ^{{cite web|url=http://filer.case.edu/~sjr16/advanced/20th_soviet_sputnik.html|title=Soviet Craft - Sputnik|last=Robbins|first=Stuart J.|date=11 January 2006|publisher=Journey Through The Galaxy|accessdate=28 July 2010|deadurl=yes|archiveurl=https://web.archive.org/web/20090204083216/http://filer.case.edu/~sjr16/advanced/20th_soviet_sputnik.html|archivedate=4 February 2009|df=}} 8. ^{{cite web|url=http://nssdc.gsfc.nasa.gov/nmc/masterCatalog.do?sc=1962-043A |title=Sputnik 20|publisher=NASA NSSDC|accessdate=28 July 2010}} 4 : Spacecraft launched in 1962|Venera program|Spacecraft which reentered in 1962|2MV |
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