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Source: Helberg (crater)

Helberg is a lunar impact crater that is located just behind the western limb of the Moon, on the far side from the Earth. Due to libration this part of the surface is sometimes brought into view, and the crater is visible under suitable lighting conditions. However even under these circumstances the crater is viewed from the edge and not much detail can be seen.
This crater is nearly attached to the east-northeastern rim of the crater Robertson. Within a crater diameter to the northwest lies Berkner, and farther to the east is Bell.
This is an eroded crater formation which overlies Helberg C along the east-northeastern side and Helberg H to the southeast. The southern rim is somewhat uneven, with an area of intrusion to the southwest. The interior floor has the remains of a crater rim at the northern end. It is otherwise relatively featureless.