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Necho (crater)

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, about a crater diameter to the south-southwest of Bečvář and further east is Love.

Necho
Apollo 14 image
Coordinates5°15′S 123°14′E / 5.25°S 123.24°E / -5.25; 123.24
Diameter36.87 km (22.91 mi)
Depth3.8 km (2.4 mi)[1]
Colongitude237° at sunrise
EponymNecho II
Necho's bright rays. Apollo 8 view facing east.
Cracks form in the impact melt sheet on the floor of Necho Crater, the southeast rim. Imaged by NASA's Lunar Reconnaissance Orbiter.
Oblique Apollo 10 image
Highly oblique view also from Apollo 10

Description

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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 extend outwards for many more crater diameters. Due to its prominent rays and generally very fresh appearance, Necho is mapped as part of the Copernican System.[2]

The mid-east and the middle part of the crater are mostly rough containing several hills.

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.

Naming

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The crater is named after Necho II, the king of the Egyptian 26th Dynasty.

The crater was informally called "the Bright One" by the Apollo 14 crew.[3] It was not formally named until 1976 by the IAU.[4]

Necho lies at the south edge of an unnamed, highly subdued, 200 km diameter crater which was originally discovered during the Apollo 16 mission and reported by Farouk El-Baz. The name Necho was proposed for the unnamed crater, but the name was eventually adopted for this smaller crater.[5]

Satellite craters

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By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint 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

Notes

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  1. ^ 83B4S1(50) Necho Crater — L&PI Lunar Topophotomap Series, Scale: 1:50,000.
  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)
  3. ^ Figure 140 caption of Apollo Over the Moon: A View From Orbit, NASA SP-362, 1978
  4. ^ Necho, Gazetteer of Planetary Nomenclature, International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN)
  5. ^ Apollo 16 Preliminary Science Report (NASA SP-315), 1972, Chapter 29, Part H: Discovery of Two Lunar Features

References

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  • 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.
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