Sei is a crater on Mercury. Its name was adopted by the International Astronomical Union (IAU) in 1976. The crater is named for Japanese writer Sei Shōnagon.[1]
 MESSENGER NAC | |
| Planet | Mercury |
|---|---|
| Coordinates | 64°37′S 88°35′W / 64.61°S 88.59°W |
| Quadrangle | Discovery |
| Diameter | 137 km (85 mi) |
| Eponym | Sei Shōnagon |
To the west of Sei is Alencar crater. To the northeast is Ma Chih-Yuan crater.
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Oblique view, looking south
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