Grotrian (crater)

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Crater characteristics
Coordinates	66.5° S, 128.3° E
Diameter	37 km
Depth	Unknown
Colongitude	233° at sunrise
Eponym	Walter Grotrian

Grotrain is a lunar impact crater that is located on the southern hemisphere on the far side of the Moon. It lies to the north of the huge Schrödinger walled-basin, within the radius of that formation's outer blanket of ejecta. The long Vallis Planck formation begins just to the north of Grotrain crater, and continues to the north-northwest toward Pikel'ner crater.

The outer wall of this crater forms a very nearly circular shape, with only a small crater across the southern rim to break up the symmetry. The interior surfaces form relatively smooth slopes that continue down to the material deposited across the bottom. Apart from the aforementioned impact and a tiny craterlet on the northern edge of the rim, this formation has not been significantly eroded by subsequent impacts.

[edit] Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Grotrian crater.