Hilbert (crater)

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Hilbert
AS15-M-1729.jpg
Hilbert from Apollo 15. NASA  photo.
Coordinates 17°52′S108°19′E / 17.87°S 108.32°E / -17.87; 108.32 Coordinates: 17°52′S108°19′E / 17.87°S 108.32°E / -17.87; 108.32
Diameter 173.24 km
Depth Unknown
Colongitude 254° at sunrise
Eponym David Hilbert
Lunar Orbiter 2 image Hilbert crater 2196 med.jpg
Lunar Orbiter 2 image
Oblique Lunar Orbiter 1 image Hibert crater 1102 h2.jpg
Oblique Lunar Orbiter 1 image

Hilbert is a lunar impact crater that is located on the far side of the Moon, just past the southeast limb. It is named for German mathematician David Hilbert. [1] It lies just beyond the region of the surface that is occasionally brought into view due to libration, and so this feature cannot be observed directly from the Earth.

The crater is attached to the southeast rim of the walled plain Pasteur, a formation nearly half as large again as Hilbert. To the southeast of Hilbert is the smaller crater Alden, while Backlund lies to the west-northwest.

Much of the outer rim of Hilbert remains relatively intact, although it is heavily eroded in places particularly in the south. The interior is relatively flat, but has been deeply gouged by several small craters. There is a short range of central ridges offset to the west of the interior midpoint. Just to the west of the ridges is Hilbert W, a crater with a smaller crater overlying the western rim, giving it a pear-like shape. Hilbert H is a circular, bowl-shaped crater in the east part of the floor. Next to the northern rim is Hilbert Y. There are also many lesser craterlets scattered about the interior.

Hilbert is one of the largest craters of Nectarian age. [2]

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 Hilbert.

HilbertLatitudeLongitudeDiameter
A15.9° S108.7° E11 km
E16.5° S111.8° E49 km
G19.0° S114.0° E50 km
H18.2° S109.6° E14 km
L21.2° S108.9° E32 km
S18.1° S105.8° E12 km
W17.1° S107.6° E20 km
Y15.6° S107.5° E28 km

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References

  1. "Hilbert". Gazeteer of Planetary Nomenclature. International Astronomical Union . Retrieved 13 September 2017.
  2. The geologic history of the Moon. USGS Professional Paper 1348. By Don E. Wilhelms, John F. McCauley, and Newell J. Trask. U.S. Government Printing Office, Washington: 1987. Table 9-4.