Römer (crater)

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Römer crater 4073 h3.jpg
Coordinates25°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
Diameter40 km
Depth3.3 km
Colongitude324° at sunrise
EponymOle 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 was named after Danish astronomer Ole Rømer.[1] 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.[2]

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.


  1. ^ "Römer (crater)". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.
  2. ^ 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)
  • Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
  • Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 978-0-521-81528-4.
  • Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 978-0-936389-27-1.
  • McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. Retrieved 2007-10-24.
  • 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.
  • Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 978-0-304-35469-6.
  • Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 978-0-521-33500-3.
  • Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 978-0-913135-17-4.
  • Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revised ed.). Dover. ISBN 978-0-486-20917-3.
  • Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 978-0-521-62248-6.
  • Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.