VENERA-D

Russian Federal Space Program (2006-2015)

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Venera-D » History

Venus is a planet that was actually rediscovered by spacecrafts. It is difficult to study Venus from Earth through a telescope, as covered by a thick layer of clouds that looks quite homogeneous in the visible spectral range. Venus attracted attention since ancient time, but the beginning of studies  was launched in 1610 by Galileo, who observed and described  phases of Venus, that looked like the moon shined by reflected sunlight. In 1761, Mikhail Lomonosov discovered  presence of the planet's atmosphere during a passage of the planet on the solar disk. However, no clear significant scientific data about Venus had been received until 1932, while astronomers W. Adam and T. Denhem (USA) recorded three bands in the Venus spectrum corresponding to carbon dioxide (CO2). Their intensities indicated a big content of CO2 in the atmosphere. In 1956 american astronomers recorded thermal emission of Venus at 3 cm wave, which corresponds to a temperature above 300 ° C. Further, in 1958, the first radar imaging allowed to determine, in particular, high surface temperature, and in 1961 the planet’s orbital period was measured by radar (243 earth days).

Before the space era it was known that the main component of Venus atmosphere was CO2. Some researchers suggested that under the thick cloud layer there was an ocean. Considering the richness of carbon compounds, it was assumed that the ocean surface might consist of oil. In the radio range high temperatures around 500 C were measured, but there was no confidence if that temperature refered to the surface or to the ionosphere. Venera-7 (1970) was the first station, which landed on the hard surface of Venus, measured temperature and pressure.

Venus is the only planet, which became “hospitable” for all Soviet missions. Ten landings were made; the first orbiter and the first (so far the only one) balloon probe in the cloud layer of Venus were launched.

Soviet space exploration of Venus began in 1961. A series of spacecrafts was called "Venera". For 20 years 16 launches to Venus were made.

The main soviet spacecraft explored Venus.

 Spacecraft  Year  Main results 
"Venera-1"1961Flyby (contact lost)
"Venera-2,3"1965 Magnetic fields, cosmic rays, streams of charged particles of low-energy, solar plasma flows and their energy spectra, cosmic radio waves and micrometeorites
“Venera-4” 

1967The first probe entered in the planet atmosphere and transmitted data
“Venera-5, 6” 1969Data transmission down to altitude of 11 km over the surface 

“Venera-7

1970The first successful landing of spacecraft on the other planet 
“Venera-8”

 
1972Landing and transmission of data for 50 minutes
“Venera-9, 10”

1975First orbiters around planet. Transmission of black-and-white photos of the planet surface by means of lander
“Venera-11, 12”

 
1978Transmission of scientific data  from the planet surface up to 110 minutes
“Venera-13, 14”

1982The first colored panoramic photos of the planet surface, soil analysis
“Venera-15, 16”

 
1983Acquisition of radar images of venus surface
“Vega-1, 2”

 
1984The first balloon probes in the atmosphere of the other planet, operated about two days and transmitted scientific data directly to the earth