Römer (crater) explained

Coordinates:	25.4°N 36.4°W
Diameter:	40 km
Depth:	3.3 km
Colong:	324
Eponym:	Ole Rømer

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. It was unofficially named as Atatürk by astronomer Hugh Percy Wilkins in his lunar map, possibly due to the fact that the Montes Taurus (or Toros Dağları in Turkish) are located in Turkey. 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

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.

• Römer K - See Franck (crater).
• Römer L - See Brewster (crater).

References

• Book: Andersson . L. E. . Whitaker . E. A. . Ewen Whitaker . 1982 . NASA Catalogue of Lunar Nomenclature . NASA RP-1097 .
• Book: Bussey . B. . Ben Bussey . Spudis . P. . Paul Spudis . 2004 . The Clementine Atlas of the Moon . . New York . 978-0-521-81528-4 .
• Book: Cocks . Elijah E. . Cocks . Josiah C. . 1995 . Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature . Tudor Publishers . 978-0-936389-27-1 .
• Web site: McDowell . Jonathan . July 15, 2007 . Lunar Nomenclature . . 2007-10-24 .
• Menzel. D. H.. Minnaert. M.. Levin. B.. Dollfus. A.. Bell. B.. Report on Lunar Nomenclature by the Working Group of Commission 17 of the IAU. 10.1007/BF00171763. Space Science Reviews. 12. 2. 136–186. 1971. 1971SSRv...12..136M. 122125855.
• Book: Moore , Patrick . Patrick Moore . 2001 . On the Moon . . 978-0-304-35469-6 .
• Book: Price , Fred W. . 1988 . The Moon Observer's Handbook . Cambridge University Press . 978-0-521-33500-3 .
• Book: Rükl , Antonín . Antonín Rükl . 1990 . Atlas of the Moon . . 978-0-913135-17-4 .
• Book: Webb , Rev. T. W. . Thomas William Webb . 1962 . Celestial Objects for Common Telescopes . 6th revised . Dover . 978-0-486-20917-3 .
• Book: Whitaker , Ewen A. . Ewen Whitaker . 1999 . Mapping and Naming the Moon . Cambridge University Press . 978-0-521-62248-6 .
• Book: Wlasuk , Peter T. . 2000 . Observing the Moon . Springer . 978-1-85233-193-1 .

Notes and References

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)