Wikipedia
Grotrian 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 walled plain Schrödinger, within the radius of that formation's outer blanket of ejecta. The long Vallis Planck formation begins just to the north of Grotrian, and continues to the north-northwest towards Pikel'ner.
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.
Grotrian may refer to:
- Grotrian (crater)
- Walter Grotrian
- Sir Herbert Brent Grotrian, 1st Baronet
- Frederick Brent Grotrian
- Grotrian diagram
- Grotrian-Steinweg, a German piano brand known as Grotrian in the U.S.