science

NGC 1605

NGC 1605 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 1605 rather than just read about it. In short: NGC 1605 is an open cluster of stars in the northern constellation of Perseus. It was discovered by German-British astronomer William Herschel on December 11, 1786.

Key takeaways

NGC 1605 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 1605 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1605 from memory before moving on to harder problems.

Reference excerpt

NGC 1605 is an open cluster of stars in the northern constellation of Perseus. It was discovered by German-British astronomer William Herschel on December 11, 1786. This cluster is located at a distance of approximately 8,000 ly (2,449 pc) from the Sun. It spans an angular size of 5.0′ × 5.0′ with an apparent visual magnitude of 11.0.

Observations This cluster has a low concentration with a Trumpler class of III 2 m. It is estimated to have 623 times the mass of the Sun with a core radius of 2.49+0.27−0.41 pc. The cluster is drifting closer to the Sun with a line of sight velocity component of −15.27±1.35 km/s. It is a member of the young thin disk population of the Milky Way. In 2021, D. Camargo presented results that suggested NGC 1605 is actually a binary open cluster system. The data showed two distinct stellar populations in the region: NGC 1605a with an age of 600 Myr and NGC 1605b at an age of 2 Gyr. This large age difference seemed to indicate a close encounter between two clusters that resulted in tidal capture. The presence of possible tidal debris appeared to support this hypothesis. However, a 2022 study of Gaia 3 data contradicted this finding, suggesting the apparent difference was the result of contamination by field stars. The open cluster Can Batlló 1 may be located less than 330 light-years (100 pc) from NGC 1605.

References

Illustrations

Worked examples

Example 1 — a first encounter with NGC 1605

Start with the simplest possible case. Write down what NGC 1605 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 1605 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 1605 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 1605

In research: NGC 1605 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 1605 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 1605 is common in secondary-school and first-year university syllabi. It links to neighbouring topics NGC objects, Open clusters, Perseus (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1605 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 1605 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1605 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 1605 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1605 in simple terms?

NGC 1605 is an open cluster of stars in the northern constellation of Perseus. It was discovered by German-British astronomer William Herschel on December 11, 1786.

Why does NGC 1605 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 1605?

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 1605.