Dirichlet (crater)

Dirichlet
LRO WAC mosaic
Coordinates11°06′N 151°24′W / 11.1°N 151.4°W / 11.1; -151.4
Diameter47.24 km (29.35 mi)[1]
DepthUnknown
Colongitude208° at sunrise
FormationLate Imbrian[2]
EponymPeter G. L. Dirichlet
Oblique Lunar Orbiter 1 image
Oblique Lunar Orbiter 5 image

Dirichlet is a lunar impact crater that is located on the Moon's far side.[3] It lies on the eastern margin of the Dirichlet-Jackson Basin,[4] and is nearly attached to the southern outer rim of the crater Henyey. To the south-southeast is the much larger crater Tsander.[5]

On the lunar geologic timescale, this formation dates to the Late Imbrian period.[2] It is a circular crater with a sharp-edged rim that is not significantly worn. There are slight outward protrusions along the eastern side. The sides of the inner walls have slumped down to form a ring of scree along the base.[6]: 69 

This formation is named after German mathematician Peter G. L. Dirichlet (1805-1859). Its designation was officially adopted by the International Astronomical Union in 1970.[1]

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 Dirichlet.[7]

Dirichlet[6]: 297  Latitude Longitude Diameter
E 12.2° N 147.8° W 26 km

References

  1. 1 2 "Dirichlet". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program. Retrieved 2026-08-22.
  2. 1 2 Byrne, Charles J. (2008). The Far Side of the Moon. Springer. p. 151. ISBN 978-1-4899-8806-5.
  3. ↑ Moore, Patrick (2000). The Data Book of Astronomy. CRC Press. p. 67. ISBN 978-1-4200-3344-1.
  4. ↑ Deng, Jiayin; et al. (December 2022). "Diverse Geological Evolution of Impact Basins on the Moon". Remote Sensing. 14 (24): 6335. Bibcode:2022RemS...14.6335D. doi:10.3390/rs14246335.
  5. ↑ "LAC 69" (PDF). Gazeteer of Planetary Nomenclature. Retrieved 2026-08-22.
  6. 1 2 Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.
  7. ↑ Grego, P. (2015). "Satellite Crater". In Hargitai, H.; Kereszturi, Á. (eds.). Encyclopedia of Planetary Landforms. New York, NY: Springer. doi:10.1007/978-1-4614-3134-3_328.

Sources

  • Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
  • Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
  • Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.
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