Römer (crater)


Römer is a lunar impact crater that is located to the north of the Sinus Amoris in the northeast section of the Moon. It was named after Danish astronomer Ole Rømer. It lies in the southwestern part of the mountainous region named the Montes Taurus. To the west-northwest is the crater-bay Le Monnier, on the eastern edge of Mare Serenitatis.
The rim of Römer has relatively high walls with a d inner surface. There is a small craterlet on the north part of the floor, and a large central peak at the midpoint. Römer has a ray system, and due to these rays, it is mapped as part of the Copernican System.
To the northwest of the crater is a prominent system of rilles named the Rimae Römer. These follow a course to the north from the western rim of the crater, and have a combined length of about 110 kilometres.

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 Römer.
RömerLatitudeLongitudeDiameter
A28.1° N37.1° E35 km
B28.6° N38.2° E20 km
C27.7° N37.0° E8 km
D24.5° N35.8° E13 km
E28.5° N39.2° E31 km
F27.1° N37.2° E22 km
G26.8° N36.2° E14 km
H25. N35.7° E6 km
J22.4° N37.9° E8 km
M25.3° N34.6° E10 km
N25.3° N38.0° E26 km
P26.5° N39.6° E61 km
R24.2° N34.6° E42 km
S24.9° N36.8° E44 km
T23.6° N36.1° E47 km
U24.3° N39.1° E28 km
V24.5° N38.6° E28 km
W26.4° N40.4° E7 km
X24.3° N40.1° E22 km
Y25.7° N36.3° E7 km
Z24.1° N36.9° E12 km

The following craters have been renamed by the IAU.