Wikipedia
Oppolzer is the remnant of a lunar crater that is located on the southern edge of Sinus Medii, along the meridian of the Moon, named after the Austrian Astronomer Theodor von Oppolzer. It is located within one crater diameter of the origin of the selenographic coordinate system at 0° N, 0° W. Attached to the surviving remnants of the southeast rim is the crater Réaumur. To the west-southwest is the lava-flooded walled plain Flammarion.
This formation consists of little more than an irregular arc of mounts along the south, and a ring of scattered ridges along the northern rim. There is a particularly wide gap in the rim to the northeast where no ridges survive to mark the crater perimeter. The interior floor has been resurfaced by basaltic lava.
A 110-km-long rille designated Rima Oppolzer passes through the southern part of the crater floor, and continues to the east and west of the crater.
Oppolzer is a surname of Austrian origin. Most people with the surname Oppolzer have their ancestors in a small region in Southern Bohemia, which was Austrian in former times, but belongs to the Czech Republic today. There is also a small village with an old fort called Oppolz (Czech name Tycha) in this region.
Famous Oppolzers are
- Johann Ritter von Oppolzer, Austrian physician, father of Theodor, born in Nove Hrady, Southern Bohemia
- Theodor von Oppolzer, Austrian astronomer, born in Prague
Both Johann and Theodor lived and worked in Vienna most of the time of their lives.
There is a lunar crater called Oppolzer, and an asteroid. Both are named after Theodor.