Lamont (lunar crater)

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Lamont (LRO).png
LRO image of the predominantly submerged crater of Lamont, on the left is Arago and below is a part of Manners
Coordinates5°00′N 23°12′E / 5.0°N 23.2°E / 5.0; 23.2Coordinates: 5°00′N 23°12′E / 5.0°N 23.2°E / 5.0; 23.2
Diameter75 km
Colongitude337° at sunrise
EponymJohann von Lamont

Lamont is a system of low ridges in the surface of Mare Tranquillitatis that is most likely a submerged impact crater. It is located about 20 km southeast of the crater Arago. Other nearby prominent craters include Maskelyne located under 150 km south-southeast and Sabine roughly to the southwest.

Lamont has the shape of two roughly concentric but incomplete rings with an inner diameter of 60 km and an outer diameter of 120 km. (The official diameter is 75 km.) Radial ridges radiate away from the center of Lamont, except in the east and west quadrants. The ridge system is only a few hundred meters in height, with a width that averages 5 km but is thicker to the southeast. This feature is only readily visible at low angles of illumination, when shadows highlight the terrain features.

This feature is associated with a mass concentration (mascon), a sub-surface region of higher-density material.


  • Dvorak, J.; Phillips, R. J. (July 28 – August 1, 1975). "Gravity anomaly and structure associated with the Lamont region of the moon". Proceedings of the 10th Lunar and Planetary Science Conference. Houston, Texas: Pergamon Press, Inc. pp. 2265–2275. Bibcode:1979LPSC...10.2265D. |access-date= requires |url= (help)

External links[edit]

  • Wood, Chuck (December 2, 2007). "A Lost Gem". Lunar Photo of the Day. Archived from the original on December 4, 2007. Retrieved 2007-12-03.