Naonobu (crater)

Naonobu (crater)

Coordinates	4°36′S 57°48′E / 4.6°S 57.8°E / -4.6; 57.8Coordinates: 4°36′S 57°48′E / 4.6°S 57.8°E / -4.6; 57.8
Diameter	34 km
Depth	Unknown
Colongitude	302° at sunrise
Eponym	Naonobu Ajima

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.

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 tiny craterlet lies just to the southwest of the mid-point. A similar craterlet lies across the western interior of the rim.

This crater was previously designated Langrenus B before being renamed by the IAU.

References

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