Delambre (crater)

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Delambre (crater)
Delambre crater 4090 h1.jpg
Coordinates 1°54′S 17°30′E / 1.9°S 17.5°E / -1.9; 17.5Coordinates: 1°54′S 17°30′E / 1.9°S 17.5°E / -1.9; 17.5
Diameter 52 km
Depth 3.5 km
Colongitude 342° at sunrise
Eponym Jean B. J. Delambre
Interior from Lunar Orbiter 3 (streak is blemish on original)
Oblique view of Delambre from Apollo 16

Delambre is a lunar impact crater that lies to the southwest of Mare Tranquillitatis, in the central highland region. To the west is the crater pair of Theon Junior and Theon Senior, the latter being more distant and located to the northwest. It is 52 kilometers in diameter and 3.5 kilometers in depth. It was named for Jean Baptiste Joseph Delambre, an 18th-century French astronomer.[1]

The rim of Delambre has a terraced interior, with a tiny craterlet lying along the northern rim. In the south is a low cut forming a slight notch. The crater interior has an irregular surface. It has high walls, with some peaks reaching 15,000 feet. Delambre was the landing site of the unmanned probe Ranger 8, which took photographs of the crater. Delambre is from the Upper Imbrian epoch, which lasted from 3.8 to 3.2 billion years ago.[1][2]

Satellite craters[edit]

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Delambre.[3]

Delambre Latitude Longitude Diameter
B 1.7° S 19.6° E 10 km
D 1.1° S 17.6° E 5 km
F 1.0° S 19.3° E 5 km
H 1.0° S 16.4° E 16 km
J 0.3° S 16.8° E 12 km


  1. ^ a b Autostar Suite Astronomer Edition. CD-ROM. Meade, April 2006.
  2. ^ Moore, Patrick (2001). On the Moon. Sterling Publishing Co.. ISBN 0-304-35469-4.
  3. ^ Bussey, B.; Spudis, P., (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 0-521-81528-2.