D'Arrest is a lunar impact crater that is located in the lava-flooded region to the west of the Mare Tranquillitatis. It is named after the German astronomer Heinrich Louis d'Arrest.[1] It lies to the southeast of the crater Agrippa and northwest of Delambre. Just to the northeast are the small, bowl-shaped craters De Morgan and Cayley.

D'Arrest
Coordinates2°18′N 14°42′E / 2.3°N 14.7°E / 2.3; 14.7
Diameter30 km
Depth1.5 km
Colongitude344° at sunrise
EponymHeinrich d'Arrest
The crater area in a Selenochromatic format Image (Si)
Oblique view from Apollo 12

The outer rim of D'Arrest is broken in several places, with a gash at the south end and a wide gap to the northeast where only a low ridge remains in place of the original wall. The interior has been resurfaced by lava, leaving a nearly flat, featureless floor. The surviving rim is low and worn, with ridges connecting it to the south and southwest.

Satellite craters

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D'Arrest crater and its satellite craters taken from Earth in 2012 at the University of Hertfordshire's Bayfordbury Observatory with the telescopes Meade LX200 14" and Lumenera Skynyx 2-1

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to D'Arrest.

D'Arrest Latitude Longitude Diameter
A 1.9° N 13.7° E 4 km
B 1.0° N 13.6° E 5 km
M 1.9° N 13.6° E 23 km
R 0.5° N 15.6° E 19 km

References

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  1. ^ "D'Arrest (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
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  • Wood, Chuck (December 12, 2006). "How Deep is That Hole". Lunar Photo of the Day. Archived from the original on June 14, 2011. - includes a couple of craters such as D'Arrest (sometimes as d'Arrest)