astronomy

NGC 6866

NGC 6866 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 6866 rather than just read about it. In short: NGC 6866 is a young open cluster of stars in the northern constellation Cygnus. It was discovered by German astronomer Caroline Herschel on 23 July 1783.

Key takeaways

NGC 6866 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 6866 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 6866 from memory before moving on to harder problems.

Reference excerpt

NGC 6866 is a young open cluster of stars in the northern constellation Cygnus. It was discovered by German astronomer Caroline Herschel on 23 July 1783. This cluster is located at an estimated distance of 4.35 ± 0.53 thousand light-years from the Sun, and is circling the Galactic Center with a slight orbital eccentricity of 0.12. It shows a heliocentric radial velocity of 12.18±1.14 km/s.

The angular radius of the cluster is estimated as about 21′±3′, while the core radius is 10.3′±1.8′. A total of 1,357 main sequence stars are determined to be likely cluster members. The combined mass of member stars is estimated as 1,274.52 M☉. It shows a loss rate of 1.92 stars per million years. The metallicity of the cluster – the abundance of elements of greater mass than helium – is similar to that in the Sun. NGC 6866 is one of four clusters located in what was the field of view of the Kepler space telescope. Using asteroseismic analysis of the Kepler data, the age of NGC 6866 is estimated to be about 430 million years old. The cluster includes 31 Delta Scuti and 8 Gamma Doradus variables, with four eclipsing binaries, and 106 stars displaying rotational modulation that is indicative of star spots. Two systems are W Ursae Majoris variables.

References

External links Media related to NGC 6866 at Wikimedia Commons

NGC 6866 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with NGC 6866

Start with the simplest possible case. Write down what NGC 6866 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 6866 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 6866 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 6866

In research: NGC 6866 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 6866 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 6866 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1783, Cygnus (constellation), NGC objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 6866 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 6866 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 6866 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 6866 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 6866 in simple terms?

NGC 6866 is a young open cluster of stars in the northern constellation Cygnus. It was discovered by German astronomer Caroline Herschel on 23 July 1783.

Why does NGC 6866 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 6866?

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 6866.