Humboldt (crater)

Humboldt is a large lunar impact crater that is located near the eastern limb of the Moon. Due to foreshortening this formation has an extremely oblong appearance. The actual shape of the crater is an irregular circle, with a significant indentation along the southeastern rim where the prominent crater Barnard intrudes. To the north-northwest of Humboldt is the large crater Hecataeus. Phillips is attached to the western rim. The rim of Humboldt is low, worn, and irregular in outline. The central peak forms a range on the crater floor. The floor surface contains a network of rilles forming a pattern of radial spokes and concentric arcs. There are also some dark patches located near the walls to the northeast, northwest, and southeast. There is a chain of craters leading from the northwest crater rim to a distance almost as long as the crater is wide. This formation is designated Catena Humboldt. Due to its location near the lunar limb, little detail was known about this crater until it was photographed by orbiting spacecraft (mainly Lunar Orbiter 4).

Humboldt

Apollo 15 image
Coordinates	27.2°S 80.9°E
Diameter	207 km
Depth	Unknown
Colongitude	254° at sunrise
Eponym	Wilhelm von Humboldt

Oblique view of Humboldt from Apollo 15

Lunar Orbiter 4 image of Humboldt (right) and the smaller Phillips (left)

LRO mosaic

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 Humboldt. Humboldt N is the largest crater within Humboldt itself, located north of the central peak. Humboldt B is located to the south of Humboldt, on the west rim of the crater Barnard.

Humboldt	Latitude	Longitude	Diameter
B	30.9° S	83.7° E	21 km
N	26.0° S	80.5° E	14 km

Apollo 12 Views

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References

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