Opelt (crater)
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 Lunar Orbiter 4 image | |
| Coordinates | 16°18′S 17°30′W / 16.3°S 17.5°W |
|---|---|
| Diameter | 48 km |
| Colongitude | 17° at sunrise |
| Eponym | Friedrich W. Opelt and Otto Moritz Opelt |
Opelt is the lava-flooded remnant of a lunar impact crater on the Mare Nubium. It lies to the north of a similar formation named Gould and to the northeast of the prominent Bullialdus.
The crater was named after the German astronomers Friedrich Wilhelm Opelt and his son Otto Moritz Opelt.[1]
Only a slightly raised outline remains of Opelt's rim, the interior having been inundated with lava. The rim has a wide break at the northern end and several smaller breaks to the south and southeast. The satellite crater Opelt E lies at the southern end of the surviving western rim. The interior floor is nearly level, with the exception of a slight rise to the southwest, which is continuous with a wrinkle ridge to the south.
To the north of Opelt on the lunar mare is a sinuous system of rilles designated Rimae Opelt. These occupy a diameter of about 70 kilometers.
