Venera 15 launched 1983

Venera 15, a Soviet-era spacecraft, launched to Venus June 2, 1983. It reached Venus on October 10, 1983 and mapped the surface using high resolution imaging systems. The last contact was made in January 1985. 

Venera 16 launched 1983

 

Venera 16, a Soviet spacecraft to Venus launched June 7, 1983, entered into orbit around the planet just one day after its twin sister Venera 15, although Venera 15 was launched only 5 days earlier. Venera 16 entered a nearly polar orbit and, together with its twin, they mapped about 25% of Venus's surface over the course of 8 months.  The last data received from Venera 16 was on June 13, 1985.