Oppolzer is the remnant of a
lunarimpact crater that is located on the southern edge of
Sinus Medii, along the
meridian of the
Moon. Its diameter is 41 km. It was named after the
Austrian astronomer
Theodor von Oppolzer.[1] 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
basalticlava.
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.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Oppolzer.
Oppolzer
Latitude
Longitude
Diameter
A
0.5° S
0.3° W
3 km
K
1.7° S
0.3° W
3 km
References
^"Oppolzer (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
Andersson, L. E.;
Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
Menzel, D. H.; Minnaert, M.; Levin, B.; Dollfus, A.; Bell, B. (1971). "Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU". Space Science Reviews. 12 (2): 136–186.
Bibcode:
1971SSRv...12..136M.
doi:
10.1007/BF00171763.
S2CID122125855.