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1MV

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Gross mass: 640 kg (1,410 lb).

Mars 1M Russian Mars flyby probe. Mars probe intended to photograph Mars on a flyby trajectory.

Venera 1VA Russian Venus probe. The 1VA probe, the first spacecraft sent towards Venus, consisted of a cylindrical body topped by a dome, totaling 2 meters in height.

• Mars probe 1M s/n 1 failure. - . Payload: 1M s/n 1. Mass: 640 kg (1,410 lb). Nation: Russia. Agency: RVSN. Program: Mars. Class: Mars. Type: Mars probe. Spacecraft Bus: 1MV. Spacecraft: Mars 1M. Decay Date: 1960-10-10 .

  This was the Soviet Union's first attempt at a planetary probe. Mars probe intended to photograph Mars on a flyby trajectory. The possible cause lay in resonance vibrations of upper stages during Stage 2 burning, which led to break of contact in the command potentiometer of the gyrohorizon. As a result a pitch control malfunctioned and the launcher began to veer off the desired ascent profile. On exceeding 7 degrees of veering in pitch, the control system failed. The upper stage with the payload reached an altitude of 120 km before burning up on re-entry into the atmosphere above East Siberia.

• Mars probe 1M s/n 2 failure. - . Payload: 1M s/n 2. Mass: 640 kg (1,410 lb). Nation: Russia. Agency: RVSN. Program: Mars. Class: Mars. Type: Mars probe. Spacecraft Bus: 1MV. Spacecraft: Mars 1M. Decay Date: 1960-10-14 . Mars probe intended to photograph Mars on a flyby trajectory. This was the Soviet Union's second attempt at a planetary probe. The upper stages and payload broke up on re-entry into the atmosphere..

• Sputnik 7 - . Payload: 2MV-2 s/n 1. Mass: 6,483 kg (14,292 lb). Nation: Russia. Related Persons: Glushko, Korolev. Agency: RVSN. Program: Venera. Class: Venus. Type: Venus probe. Spacecraft Bus: 1MV. Spacecraft: Venera 1VA. Decay Date: 1961-02-26 . USAF Sat Cat: 71 . COSPAR: 1961-Beta-1. Apogee: 318 km (197 mi). Perigee: 212 km (131 mi). Inclination: 64.90 deg. Period: 89.80 min.

  The escape stage entered parking orbit but the main engine cut off just 0.8 s after ignition due to cavitation in the oxidiser pump and pump failure.. The payload attached together with escape stage remained in Earth orbit.

  The booster launched into a beautiful clear sky, and it could be followed by the naked eye for four minutes after launch. The third stage reached earth parking orbit, but the fourth stage didn't ignite. It was at first believed a radio antenna did not deploy from the interior of the stage, and it did not receive the ignition commands. Therefore the Soviet Union has successfully orbited a record eight-tonne 'Big Zero' into orbit. The State Commission meets two hours after the launch, and argues whether to make the launch public or not, and how to announce it. Glushko proposes the following language for a public announcement: 'with the objective of developing larger spacecraft, a payload was successfully orbited which provided on the first revolution the necessary telemetry'. Korolev and the others want to minimize any statement, to prevent speculation that it was a reconnaissance satellite or a failed manned launch. Kamanin's conclusion - the rocket didn't reach Venus, but it did demonstrated a new rocket that could deliver an 8 tonne thermonuclear warhead anywhere on the planet. The commission heads back to Moscow.

• Venera failure announcement - . Nation: Russia. Program: Vostok. Flight: Vostok 1. Spacecraft Bus: 1MV. Spacecraft: Venera 1VA. Tass announces launch of a new 'Heavy Sputnik' - the cover finally agreed by the leadership for the failed Venera launch..

• Venera 1 - . Payload: 1VA s/n 2, Venera 1 (Sputnik 8, AMS). Mass: 644 kg (1,419 lb). Nation: Russia. Related Persons: Korolev. Agency: RVSN. Program: Venera. Class: Venus. Type: Venus probe. Spacecraft Bus: 1MV. Spacecraft: Venera 1VA. USAF Sat Cat: 80 . COSPAR: 1961-Gamma-1.

  Venera 1 was the first spacecraft to fly by Venus. The 6424 kg assembly was launched first into a 229 x 282 km parking orbit, then boosted toward Venus by the restartable Molniya upper stage. On 19 February, 7 days after launch, at a distance of about two million km from Earth, contact with the spacecraft was lost. On May 19 and 20, 1961, Venera 1 passed within 100,000 km of Venus and entered a heliocentric orbit. This failure resulted in only the following objectives being met: checking of methods of setting space objects on an interplanetary course; checking of extra-long-range communications with and control of the space station; more accurate calculation of the dimension of the solar system; a number of physical investigations in space. Additional Details: here....