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Abulfeda

2005.11.09 11:43 UT Age 7 days 10-ir f/6 Newtonian + 2.5X + ToUcam

(mosaic of 4 video clips)

Catena is a chain of small craters, generally resulted from secondary impacts, or from fragmental impacts of a tidally disrupted meteoroid / asteroid. An exception is the chain of tiny craters inside Rima Hyginus Map 13, which appears to be volcanic rather than impact-originated.

The most known crater chain is Catena Abulfeda shown in the middle of Image T070, length 210 km. At low power, it resembles a thin, bright line running from the rim of Abulfeda (diameter 65 km) to the northern end of Rupes Altai. At high power, it resolves to over 20 craterlets in a chain. A short, loose chain of craterlets is also shown by Label 24 in T070. Note the interesting arc array of craters from Abulfeda to Apianus (Label 1 to 7), the irregular crater Sacrobosco (dia. 98 km, Label 9) and the bright patch just north of Descartes (Label 14).

Another crater chain, Catena Davy, is shown in T093. It requires high power to spot. This chain consists of 23 craters from 1 to 3 km in diameter, 50 km long. It is likely caused by fragmental impacts of a tidally disrupted "rubble pile" meteoroid / asteroid, because most craters in the chain do not overlap. To the north of Davy C (diameter 3.4 km) is another catena but it is nameless.

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