Helmert (crater)
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| Crater characteristics | |
|---|---|
| Coordinates | 7.6° S, 87.6° E |
| Diameter | 26 km |
| Depth | Unknown |
| Colongitude | 273° at sunrise |
| Eponym | Friedrich R. Helmert |
Helmert is a lunar crater at the southern edge of the Mare Smythii. It lies near the eastern limb of the Moon, and from the Earth it is seen nearly from the side. The visibility of this feature can be strongly affected by libration of the Moon in its orbit.
This crater forms part of a merged pair with the similar Kao crater on its northern side. There is a gap in the rims where these two craters are joined, and the interior floors have been resurfaced by lava, leaving a level surface across the bottom of both craters. This floor is nearly featureless, and has the same low albedo as the dark lunar mare to the north. The outer rim has a small crater joined to the eastern edge of the northern gap, but is otherwise not overlaid by any notable craters.
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