This page no longer updated from 31 October 2001. Latest version can be found at www.astronautix.com

astronautix.com Venera 4V-2

Venera 15
Venera 15 - Venera-15 Venus radar lunar surface mapper

Credit: Andy Salmon. 59,172 bytes. 394 x 482 pixels.



Manufacturer's Designation: 4V-2. Class: Planetary. Type: Venus. Nation: USSR. Manufacturer: Lavochkin.

Venera radar mappers which used 8 cm band side-looking radar mappers to study the surface properties of Venus. In comparison to the 4V-1 bus flown previously they had extra solar panels and their propellant compartments were lengthened by a little over one meter. Two spacecraft were inserted into Venus orbit a day apart with their orbital planes shifted by an angle of approximately 4 degrees relative to one another. This made it possible to reimage an area if necessary. Each spacecraft was in a nearly polar orbit with a periapsis at 62 N latitude. Together, the two spacecraft imaged the area from the north pole down to about 30 degrees N latitude over the 8 months of mapping operations. Each spacecraft consisted of a 5 m long cylinder with a 6 m diameter, 1.4 m tall parabolic dish antenna for the synthetic aperture radar (SAR) at one end. A 1 meter diameter parabolic dish antenna for the radio altimeter was also located at this end. The electrical axis of the radio altimeter antenna was lined up with the axis of the cylinder. The electrical axis of the SAR deviated from the spacecraft axis by 10 degrees. 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. Two square solar arrays extended like wings from the sides of the cylinder. A 2.6 m radio dish antenna for communications was also attached to the side of the cylinder.


Specification

Total Mass: 4,000 kg.


Venera 4V-2 Chronology


02 June 1983 Venera 15 Program: Venera. Launch Site: Baikonur . Launch Vehicle: Proton 8K82K / 11S824M. Mass: 4,000 kg. Perigee: 1,000 km. Apogee: 65,000 km. Inclination: 87.5 deg.

Venera 15 was part of a two spacecraft mission (along with Venera 16) designed to use side-looking radar mappers to study the surface properties of Venus. The two spacecraft were inserted into Venus orbit a day apart with their orbital planes shifted by an angle of approximately 4 degrees relative to one another. This made it possible to reimage an area if necessary. Each spacecraft was in a nearly polar orbit with a periapsis at 62 N latitude. Together, the two spacecraft imaged the area from the north pole down to about 30 degrees N latitude over the 8 months of mapping operations. Data is for Venus orbit.


07 June 1983 Venera 16 Program: Venera. Launch Site: Baikonur . Launch Vehicle: Proton 8K82K / 11S824M. Mass: 4,000 kg.

Venus radar mapper; entered Venus orbit 10/14/83. Venera 16 was part of a two spacecraft mission (along with Venera 15) designed to use side-looking radar mappers to study the surface properties of Venus. The two spacecraft were inserted into Venus orbit a day apart with their orbital planes shifted by an angle of approximately 4 degrees relative to one another. This made it possible to reimage an area if necessary. Each spacecraft was in a nearly polar orbit with a periapsis at 62 N latitude. Together, the two spacecraft imaged the area from the north pole down to about 30 degrees N latitude over the 8 months of mapping operations.



Bibliography:



Back to Index
Last update 12 March 2001.
Contact Mark Wade with any corrections or comments.
Conditions for use of drawings, pictures, or other materials from this site..
© Mark Wade, 2001 .