science

NGC 146

NGC 146 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 NGC 146 rather than just read about it. In short: NGC 146 is a small open cluster in the constellation Cassiopeia. It was discovered by John Herschel in 1829 using his father's 18.7 inch reflecting telescope.

Key takeaways

NGC 146 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 146 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 146 from memory before moving on to harder problems.

Reference excerpt

NGC 146 is a small open cluster in the constellation Cassiopeia. It was discovered by John Herschel in 1829 using his father's 18.7 inch reflecting telescope.

Location

NGC 146 is fairly easy to locate in the sky, being half a degree away from the bright star Kappa Cassiopeiae. However, spotting the cluster itself is difficult because of its low apparent magnitude of 9.1. Its relatively high declination of about 63° means it is not visible for below 27° S. Its distance is estimated at about 3,000 parsecs (10,000 light years) away. NGC 146 is close to the open cluster King 14, both being located in the Perseus Arm. The two clusters follow similar circular orbits throughout the Milky Way's thin disk, orbiting at a distance of 9,000 parsecs (29,000 light-years) from the Galactic Center with an orbital period of about 255 million years. The two likely originated from the same giant molecular cloud but are not gravitationally bound to each other.

Characteristics The cluster is fairly young, as there are numerous B-type and A-type main sequence stars and pre-main-sequence stars but relatively few evolved supergiants. Among its most massive stars are two Herbig Be stars.

References

Further reading "The NGC/IC Project". Archived from the original on 2013-01-15. Retrieved 2016-08-02.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 146

Start with the simplest possible case. Write down what NGC 146 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 NGC 146 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 146 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 146

In research: NGC 146 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 NGC 146 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 146 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cassiopeia (constellation), NGC objects, Open clusters, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 146 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 146 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 146 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 146 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 146 in simple terms?

NGC 146 is a small open cluster in the constellation Cassiopeia. It was discovered by John Herschel in 1829 using his father's 18.7 inch reflecting telescope.

Why does NGC 146 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 NGC 146?

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 146.