Davy is a small lunarcrater that is located on the eastern edge of the Mare Nubium. It is overlaying the lava-flooded remains of the satellite crater 'Davy Y' to the east, a formation which contains a crater chain designated Catena Davy. This linear string of tiny craters runs from the mid-point of 'Davy Y' toward Ptolemaeus walled-basin in the north-northeast. To the southeast of Davy is the prominent Alphonsus crater.
The outer rim of Davy is low, and the interior has been partly inundated by lava flows in the past. The perimeter is somewhat polygonal in shape, especially in the western half, and the southeast rim has been overlain by the 'Davy A' crater. The later is bowl-shaped with a notch in the northern rim. The interior of Davy lacks a central peak, although the rim of 'Davy Y' forms a low ridge leading from the northern outer rim.
Satellite craters
By convention these features are identified on Lunar maps by placing the letter on the side of the crater mid-point that is closest to Davy crater.
Secondary crater chains on the Moon are common, but such chains are usually radial or nearly radial to a large crater or basin, occur in the vicinity of other such chains, and have raised rims with a characteristic ‘chevron’ imprint between craters that point back to the primary.
The remarkably regular shape, spacing and alignment of the craters in the 47-km-long Davycrater chain is unmatched anywhere else on the lunar surface.
On your atlas, Davy is shown as the small crater to the (lunar) east of the large crater Alphonsus.
The chains are radial to the primary or parent crater and the apexes of the
The chains are radial to the primary or parent crater and the apexes of the "herringbone" ridges point toward it.
A solid blanket of ejecta is visible for approximately one- half crater diameter outside the rim, and the radial pattern of secondary craters, crater clusters, ridges, and grooves is visible outward to a full crater diameter.
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