This uncrewed orbiter was to map the surface of Venus using high resolution imaging systems.

The latest data from the spacecraft were received on June 13, 1985, when it responded to the signal sent from Earth for Vega 1.

A 1-metre (3 ft 3 in) diameter parabolic dish antenna for the radio altimeter was also located at this end.

During imaging, the radio altimeter would be lined up with the center of the planet (local vertical) and the SAR would be looking off to the side at 10 degrees.

A bulge at the opposite end of the cylinder held fuel tanks and propulsion units.