Geological Chronicle
Situated across the southern highlands between Maginus and Clavius, Deluc is an impact crater measuring 45.69 kilometers across with an interior depth of 3.3 kilometers. It dates to the Pre-Nectarian period, an interval of the lunar geologic timescale lasting from 4.55 to 3.85 billion years ago.
Subsequent bombardment has degraded the structure. The satellite crater Deluc H intrudes into the northeast rim, where a triangular bulge of material covers the floor toward the midpoint of the interior. Along the southern outer rim, Deluc T joins the formation to Deluc D.
The remaining rim is not quite circular, showing an outward bulge to the northwest. Inside the crater, a history of tiny impacts has smoothed the terrain into a largely level floor, marked in the east by a tiny interior craterlet.
The International Astronomical Union officially adopted the designation in 1935, honoring Swiss geologist and physicist Jean-André Deluc following its nineteenth-century inclusion in lunar nomenclature.