Oken (crater)

Oken
	LRO image
Coordinates	43°42′S 75°54′E / 43.7°S 75.9°E
Diameter	72 km
Depth	Unknown
Colongitude	286° at sunrise
Eponym	Lorenz Oken

Oken is a lunar impact crater near the southeastern limb of the Moon. It is normally visible from the Earth, but is foreshortened and within the region of the surface that is subject to libration. To the south and east of this feature is the broad, uneven Mare Australe, which extends to the far side of the Moon.

The interior of this crater has become flooded by basaltic lava, producing a nearly level, featureless surface with a low albedo. A number of tiny craterlets mark this surface, particularly in the northwest. The surrounding mountain ring has been eroded by impacts, and is somewhat distorted from a true circular shape. There is a wide bulge in the rim toward the southeast, where the surface is lower and more rugged. Slight bulges also exist to the southwest and northwest. The rim is marked by a number of tiny impacts along the edge, particularly to the southwest.

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 Oken.

Oken	Latitude	Longitude	Diameter
A	43.2° S	71.3° E	36 km
E	46.1° S	78.9° E	12 km
F	44.4° S	71.5° E	21 km
L	43.1° S	78.2° E	10 km
M	41.8° S	75.4° E	7 km
N	42.4° S	74.5° E	40 km

References

Andersson, L. E.; Whitaker, E. A. (1982). NASA Catalogue of Lunar Nomenclature. NASA RP-1097.
Blue, Jennifer (July 25, 2007). "Gazetteer of Planetary Nomenclature". USGS. Retrieved 2007-08-05.
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. S2CID 122125855.
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.

LRO image
Coordinates	43°42′S 75°54′E / 43.7°S 75.9°E / -43.7; 75.9
Diameter	72 km
Depth	Unknown
Colongitude	286° at sunrise
Eponym	Lorenz Oken