Römer (crater)

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Römer crater 4073 h3.jpg
Coordinates 25°24′N 36°24′E / 25.4°N 36.4°E / 25.4; 36.4Coordinates: 25°24′N 36°24′E / 25.4°N 36.4°E / 25.4; 36.4
Diameter 40 km
Depth 3.3 km
Colongitude 324° at sunrise
Eponym Ole Rømer
Oblique view of Römer from Apollo 17.
Apollo 15 captured this view as it flew over Römer at low altitude.
Lunar Orbiter 4 image of Rimae Römer

Römer is a lunar impact crater that is located to the north of the Sinus Amoris in the northeast section of the Moon. 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 terraced 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.[1]

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[edit]

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.

Römer Latitude Longitude Diameter
A 28.1° N 37.1° E 35 km
B 28.6° N 38.2° E 20 km
C 27.7° N 37.0° E 8 km
D 24.5° N 35.8° E 13 km
E 28.5° N 39.2° E 31 km
F 27.1° N 37.2° E 22 km
G 26.8° N 36.2° E 14 km
H 25.9° N 35.7° E 6 km
J 22.4° N 37.9° E 8 km
M 25.3° N 34.6° E 10 km
N 25.3° N 38.0° E 26 km
P 26.5° N 39.6° E 61 km
R 24.2° N 34.6° E 42 km
S 24.9° N 36.8° E 44 km
T 23.6° N 36.1° E 47 km
U 24.3° N 39.1° E 28 km
V 24.5° N 38.6° E 28 km
W 26.4° N 40.4° E 7 km
X 24.3° N 40.1° E 22 km
Y 25.7° N 36.3° E 7 km
Z 24.1° N 36.9° E 12 km

The following craters have been renamed by the IAU.

View of the Earth[edit]

Being located at the 25th parallel north, its view of the Earth is seen at the lunar sky all year round at around 25 degrees facing south from the overhead and at about 36 degrees towards the west from the top.


  1. ^ The geologic history of the Moon, 1987, Wilhelms, Don E.; with sections by McCauley, John F.; Trask, Newell J. USGS Professional Paper: 1348. Plate 11: Copernican System (online)