Naonobu (crater)

Naonobu is a small lunar impact crater named after Japanese mathematician Ajima Naonobu. It is located on the eastern Mare Fecunditatis, to the northwest of the prominent crater Langrenus, and it forms a triple-crater formation with the adjacent Atwood to the south and Bilharz just to the southwest. Naonobu and Atwood are separated by only a few kilometres.

Naonobu

Apollo 15 image
Coordinates	4.6°S 57.8°E / -4.6; 57.8
Diameter	34 km
Depth	Unknown
Colongitude	302° at sunrise
Eponym	Naonobu Ajima

Oblique view of Bilharz (top), Atwood (lower left), and Naonobu (lower right), from Apollo 11

The interior of this crater has been flooded with basaltic lava, leaving a relatively flat interior and a reduced outer rim. There is no central peak, but a small crater lies just to the southwest of the midpoint. A similar crater lies across the western interior of the rim.

This crater was previously designated Langrenus B before being renamed by the IAU in 1976.^[1]