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Venera 4 (Russian: Венера-4, lit. 'Venus-4'), also designated 4V-1 No.310, was a probe in the Soviet Venera program for the exploration of Venus.The probe comprised a lander, designed to enter the Venusian atmosphere and parachute to the surface, and a carrier/flyby spacecraft, which carried the lander to Venus and served as a communications relay for it.
The Venera probes provided direct data regarding Venus' surface and atmosphere while also providing important information on electronics lifetime under Venus' harsh conditions. Venera 4 was the first successful probe, and showed that CO 2 is the main component in Venus' atmosphere.
(3MV-1 No.4) 2 April 1964: OKB-1 Soviet Union: Flyby/Lander Spacecraft failure Electronics shorted out, communications lost before flyby. [11] Flew past Venus on 14 July 1964. Molniya-M: Venera 2 (3MV-4 No.4) 12 November 1965: OKB-1 Soviet Union: Flyby Spacecraft failure Flew past Venus on 27 February 1966, closest approach at 02:52 UTC.
On March 1, 1966, the Venera 3 Soviet space probe crash-landed on Venus, becoming the first spacecraft to reach the surface of another planet. Its sister craft Venera 2 had failed due to overheating shortly before completing its flyby mission. Capsule of Venera-4 in Memorial Museum of Astronautics
Venera 3 was intended to soft-land on Venus. Contact with the spacecraft was lost before arrival, and Venera 3 crashed. [1] Venera 4: Venus 12 June 1967 Molniya 8K78M Baikonur 1/5 18 October 1967 entered atmosphere: 129 days (4 mo, 7 d) Venera 4, a Venus atmosphere probe, continued to transmit to an altitude of 25 km [2] Venera 5: Venus 5 ...
The spacecraft was named Kosmos 96, part of a series typically used for military and experimental satellites in order to cover up the failure. Had it departed Earth's orbit, it would have received the next designation in the Venera series, at the time Venera 4. Kosmos 96 was destroyed when it re-entered the Earth's atmosphere on 9 December 1965 ...
After Venera 4's failure to reach the surface of Venus intact, the next 3MV probes (Venera 5 and 6) were strengthened again, this time to withstand a 450-g (compared to the 300-g entry of Venera 4) re-entry due to the 1969 launch window's higher velocity. The V-70 design took this further, with the capsule being slightly more egg-shaped.
The Venera 4 and Mariner 5 data was subsequently analysed together under a combined Soviet–American working group of COSPAR in 1969, [6] [7] an organization of early space cooperation. [8] With the data of these missions, it was clear that Venus had a very hot surface and an atmosphere even denser than expected.