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| Coordinates | 2°48′N 17°18′E / 2.8°N 17.3°E |
|---|---|
| Diameter | 18 km |
| Depth | 2.7 km |
| Colongitude | 343° at sunrise |
| Eponym | St. Dionysius |
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Dionysius is a lunar impact crater that lies on the western edge of the Mare Tranquillitatis. It was named after Dionysius the Areopagite.[1] To the southeast is the crater pair of Ritter and Sabine. Just to the northwest is the system of rilles designated Rimae Ritter. These clefts follow a generally northwest direction.
The rim of Dionysius is generally circular and shows little sign of wear. The crater possesses a small ray system with a radius of over 130 kilometers. The formation has a high albedo and appears bright when the Sun is nearly overhead during a full Moon. It is surrounded by a bright halo, with darker material farther out. Some darker deposits are in the form of relatively rare dark rays.
- ^ "Dionysius (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.