Necho (crater)

Necho (crater)

Coordinates	5°00′S 123°06′E / 5.0°S 123.1°E / -5.0; 123.1Coordinates: 5°00′S 123°06′E / 5.0°S 123.1°E / -5.0; 123.1
Diameter	30 km
Depth	2.1 km
Colongitude	237° at sunrise
Eponym	Necho II

Cracks form in the impact melt sheet on the floor of Necho Crater. Imaged by NASA's Lunar Reconnaissance Orbiter.

Necho is a lunar impact crater on the far side of the Moon, and therefore cannot be seen directly from the Earth. It lies to the northeast of the larger crater Langemak, and about a crater diameter to the south-southwest of Bečvář.

The most distinctive aspect of this crater is the prominent ray system that surrounds the outer rim. This higher-albedo skirt of ejecta extends in a nearly continuous fashion out for several crater diameters, but is more extensive to the north and northeast than elsewhere. Beyond this continuous skirt, occasional rays and wisps of light material extent outwards for many more crater diameters.

The outer rim of Necho is somewhat uneven in form, particularly along the western side where it possesses two inner sides that overlap in almost spiral-like fashion. The rim has a slight outward bulge to the east, and is more uneven along that edge. The inner wall and floor has a high albedo, giving the crater a bright appearance. The inner side is generally wider on the western side, and the interior floor is offset to the eastern half.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Necho.

Necho	Latitude	Longitude	Diameter
M	6.0° S	123.1° E	12 km
P	6.8° S	122.0° E	75 km
R	5.6° S	122.0° E	18 km
V	4.3° S	120.6° E	16 km

References

• Wood, Chuck (April 27, 2007). "Necho's peculiar rays". Lunar Photo of the Day. http://www.lpod.org/?m=20070427. Retrieved 2007-04-27. 

• 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. http://planetarynames.wr.usgs.gov/. Retrieved 2007-08-05. 
• Bussey, B.; Spudis, P. (2004). The Clementine Atlas of the Moon. New York: Cambridge University Press. ISBN 0-521-81528-2. 
• Cocks, Elijah E.; Cocks, Josiah C. (1995). Who's Who on the Moon: A Biographical Dictionary of Lunar Nomenclature. Tudor Publishers. ISBN 0-936389-27-3. 
• McDowell, Jonathan (July 15, 2007). "Lunar Nomenclature". Jonathan's Space Report. http://host.planet4589.org/astro/lunar/. 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.  edit
• Moore, Patrick (2001). On the Moon. Sterling Publishing Co. ISBN 0-304-35469-4. 
• Price, Fred W. (1988). The Moon Observer's Handbook. Cambridge University Press. ISBN 0-521-33500-0. 
• Rükl, Antonín (1990). Atlas of the Moon. Kalmbach Books. ISBN 0-913135-17-8. 
• Webb, Rev. T. W. (1962). Celestial Objects for Common Telescopes (6th revision ed.). Dover. ISBN 0-486-20917-2. 
• Whitaker, Ewen A. (1999). Mapping and Naming the Moon. Cambridge University Press. ISBN 0-521-62248-4. 
• Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 1-85233-193-3. 

External links

• LTO-83B4 Necho — L&PI topographic map.