astronomy

NGC 6742

NGC 6742 is a astronomy 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 NGC 6742 rather than just read about it. In short: NGC 6742 (also known as Abell 50) is a planetary nebula in the constellation Draco. NGC 6742 was discovered by German-British astronomer William Herschel in 1788.

Key takeaways

NGC 6742 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 6742 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 6742 from memory before moving on to harder problems.

Reference excerpt

NGC 6742 (also known as Abell 50) is a planetary nebula in the constellation Draco. NGC 6742 was discovered by German-British astronomer William Herschel in 1788. Very few studies have been carried out on NGC 6742 and the identification of the central star of the nebula by the Kepler Space Telescope is uncertain.

Morphology Two distances are indicated in the SIMBAD astronomical database: 5,150 ± 1,030 kpc (~16,800 ly) and approximately 5,091 pc (~16,600 ly). Its apparent size is 0.553′. No data is available for its speed.

Observation NGC 6742 has a magnitude of 13.4, meaning that its surface brightness is high enough to be seen with a 25 cm diameter telescope. It appears as a round disk measuring 30"6.

Gallery

See also Lists of nebulae List of planetary nebulae List of NGC objects (6001–7000)

References

External links NGC 6742 at SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with NGC 6742

Start with the simplest possible case. Write down what NGC 6742 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 NGC 6742 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 NGC 6742 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 NGC 6742

In research: NGC 6742 appears in astronomy 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 NGC 6742 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: NGC 6742 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1788, Discoveries by William Herschel, Draco (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for NGC 6742 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 NGC 6742 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 6742 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain NGC 6742 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 6742 in simple terms?

NGC 6742 (also known as Abell 50) is a planetary nebula in the constellation Draco. NGC 6742 was discovered by German-British astronomer William Herschel in 1788.

Why does NGC 6742 matter?

Because it connects several astronomy 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 NGC 6742?

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 NGC 6742.