Alden is a lunar impact crater that lies on the far side of the Moon, between Hilbert to the north-northwest and Milne to the south-southeast. To the south-southwest lies Scaliger.
This formation dates from the Early Imbrian period on the lunar geologic timescale. Alden has a low rim that is overlain in the north and northeast by Alden C and the smaller Alden E. The rim is worn and eroded, especially along the southern wall. The floor is somewhat irregular and pitted. The small crater Alden V lies just inside the north rim, and is attached to Alden C to the east.
This crater is named after American astronomer Harold Alden (1890–1964). Its designation was formally adopted by the International Astronomical Union in 1970. During the planning for the Apollo 8 mission that circled the Moon, this crater was informally referred to as 'See'.
Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Alden.
AldenLatitudeLongitudeDiameterB20.5° S112.6° E17 kmC22.5° S111.4° E50 kmE23.2° S112.4° E28 kmV22.5° S110.1° E19 km
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