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46 - Pitatus

Published online by Cambridge University Press:  05 October 2012

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Summary

Pitatus 29.9°S, 13.5°W

Pitatus is a large, very interesting lava-flooded complex crater with a diameter of 106 km. Pitatus belongs to the group of FFC craters that includes craters such as Gassendi and Posidonius. Rimae Pitatus extend in a circular fashion, partially interrupted but almost complete around the inner wall of the crater. Additional sections also cross the crater's floor both in east-west and north-south directions. The bright patches on the floor consist of ejected material from the Tycho impact.

Hesiodus 29.4°S, 16.3°W

Hesiodus is directly bordering Pitatus on the west. It is a lava-flooded crater, about 42 km in diameter. Almost in the centre of the crater's floor lies the small crater Hesiodus D (5 km), with another crater pit directly east of it. The southwestern wall is overlapped by Hesiodus A (15 km). Hesiodus A is, like the crater Marth, a rare example of a crater with a concentric double wall (a double-walled crater).

At local sunrise (waxing Moon), Pitatus and Hesiodus offer a particular spectacle for observation. Between the crater walls of Pitatus and Hesiodus there is a valley-like structure. Because Pitatus lies farther to the east, the Sun rises slightly earlier for this crater. If the geometrical conditions are favourable (the positions of the Sun, Earth and Moon), sunlight falls through the valley between the crater walls and illuminates – like the beam of light from a searchlight – part of the crater floor of Hesiodus, otherwise still hidden in the lunar night.

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Publisher: Cambridge University Press
Print publication year: 2012

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