Impressive mountain range on the southern shores of Mare Imbrium and stretching northeast from Eratosthenes. The highest peaks reaches well over 5000 meters.
Dionysius was formed at the border between the darker mare and the brighter basin ejecta. The jumble of bright and dark rays seen around the crater was created at the impact, and is a mix of the different materials. At the eyepiece the rays were quite obvious, but difficult to capture in the sketch. To the east (left) a beautiful pair of low rim craters, Sabine and Ritter.
See this post.
So far this is one of the most fascinating objects I have observed on the moon. These chains of craterlets were formed when rubble following the Copernicus impact rained down on Mare Insularum. At average seeing only the biggest craterlets were visible, but when the seeing stabilized the full range of the bombardment came into view. Just south of Copernicus (up in the sketch) is another Lunar 100 object, Copernicus H (L74). Notice also the barely visible sunken crater Stadius, above Eratosthenes.
I only managed to observe five of the six Hortensius domes. I couldn’t make out their summit pits. To the right of the sketch is another vulcano, Milichius π, with the pit clearly visible. The bright rays crossing the area are ejecta from Kepler and/or Copernicus.
System of rilles east of Triesnecker. The east-most rille (left in image) was somewhat wider and easier to see. The western rille was only discernible at moments of steady seeing.