So, we left some litter on Venus.

Angie, it wouldn't be the first! The Soviets landed probes on Venus as early as 1970. But there wouldn't have been much of Mariner lying around on Venus. It burned up in the planet's atmosphere after gathering aerodynamic data about The Venusian atmosphere.

And as you mention Moon craters named for women, there are only about thirty from the over 1500 craters that are named. However, all but three of the surface features of Venus are named for women. (The only feature named for a man was named before this naming convention was instituted.) Unfortunately, considering the wide range of impressive women in history, almost all of the names come from mythology and folklore.