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Necho (crater)

Necho (crater) is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Necho (crater) rather than just read about it. In short: 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 (crater) — main illustration
Necho (crater) — illustration

Key takeaways

  • Necho (crater) belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Necho (crater) to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Necho (crater) from memory before moving on to harder problems.

Reference excerpt

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.

Description This formation dates to the Copernican period and it has a meteoritic iron-rich impact melt. 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. 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. The infrared spectrum of pure crystalline plagioclase has been identified on the interior floor. The mid-east and the middle part of the crater are mostly rough containing several hills.

Naming 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. It was not formally named until 1976 by the IAU. 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.

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 Necho.

References

Sources

External links

Necho at The Moon Wiki high-resolution photo of the interior from Apollo 14 (AS14-72-9975) at L&PI LTO-83B4 Necho — L&PI topographic map. 83B4S1(50) Necho Crater — L&PI Lunar Topophotomap Series, Scale: 1:50,000. Apollo 17 panoramic camera images with Necho near center: AS17-P-2461, AS17-P-2463, AS17-P-2466, AS17-P-2468 LRO articles: A Molten Flood Necho's Terraces Necho's Jumbled Floor Impact Melt at Necho Crater Necho Crater in 2009

Related articles Wood, Chuck (April 27, 2007). "Necho's Peculiar Rays". Lunar Photo of the Day. Archived from the original on September 27, 2007. Retrieved 2007-04-27. Wood, Chuck (August 26, 2009). "Abusing Rocks". Lunar Photo of the Day. Archived from the original on August 29, 2009. Retrieved September 11, 2017.

Illustrations

Necho (crater) illustration
Necho (crater): Necho's bright rays. Apollo 8 view facing east.
Necho's bright rays. Apollo 8 view facing east.
Necho (crater): Cracks form in the impact melt sheet on the floor of Necho Crater, the southeast rim. Imaged by NASA's Lunar Reconnaissance Orbiter.
Cracks form in the impact melt sheet on the floor of Necho Crater, the southeast rim. Imaged by NASA's Lunar Reconnaissance Orbiter.
Necho (crater): Oblique Apollo 10 image
Oblique Apollo 10 image
Necho (crater): Highly oblique view also from Apollo 10
Highly oblique view also from Apollo 10

Worked examples

Example 1 — a first encounter with Necho (crater)

Start with the simplest possible case. Write down what Necho (crater) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Necho (crater) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Necho (crater) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Necho (crater)

In research
Necho (crater) appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Necho (crater) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Necho (crater) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Impact craters on the Moon, LQ22 quadrangle, so understanding it makes those chapters shorter.
In everyday life
Look for Necho (crater) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Necho (crater) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Necho (crater) means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Necho (crater) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Necho (crater) in simple terms?

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.

Why does Necho (crater) matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Necho (crater)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Necho (crater).

Tags

  • Impact craters on the Moon
  • LQ22 quadrangle

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