The crater is difficult to observe in this location, and visibility of this feature is affected by libration.

The rim of this crater has been worn and eroded by impacts, leaving an irregular ring of ridges and incisions along the inner wall.

Along the southeast, Petrov B is attached to the southeastern exterior and the two are joined by a narrow valley.

The interior floor of Petrov has been completely resurfaced by basaltic lava, leaving a low-albedo surface that is relatively smooth and featureless.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Petrov.