science

NGC 2126

NGC 2126 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 2126 rather than just read about it. In short: NGC 2126 is a moderately rich open cluster of stars in the northern constellation of Auriga. It was discovered on November 12, 1787 by German-British astronomer William Herschel.

Key takeaways

NGC 2126 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 2126 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 2126 from memory before moving on to harder problems.

Reference excerpt

NGC 2126 is a moderately rich open cluster of stars in the northern constellation of Auriga. It was discovered on November 12, 1787 by German-British astronomer William Herschel. This conglomeration is positioned around half way between the brighter stars Beta Aurigae and Xi Aurigae. It is a challenge to find in a small telescope, having stars of 13th magnitude and fainter. NGC 2126 has an apparent visual magnitude of 10.2 and spans an angular size of 6 arcminutes. It is located at an estimated distance of 4,126 light-years (1,265 pc). This cluster has a Trumpler class of III 2 m :b, indicating a fairly disparate set of stars (III), with a moderate range of brightness (2), and a medium number of stars (m). It is of intermediate age, estimated at approximately 1.3 to 1.6 Gyr. The cluster has a King core radius of 3.20 ± 0.68 ly (0.98 ± 0.21 pc) and tidal radius of 23.3 ± 5.2 ly (7.15 ± 1.59 pc). After removing contaminating stars, a 2003 study by A. Gáspár and associates found 103 members within a radius of 8′. As of 2024, a total of 129 stars have been identified that have a membership probability of at least 90%. In a field around the cluster, six variable stars were discovered by A. Gáspár and associates in 2003. These include two δ Scuti, two long period variables, an Algol variable, and a possible eclipsing binary with a pulsating component. The variable count was increased by 16 in 2009 within a 1° field of view, including four eclipsing systems, at least one W UMa binary, and an RS CVn variable. By 2025, data from the Transiting Exoplanet Survey Satellite indicated there are 25 cluster member variables and 85 field variables within a 9 arcminute radius of NGC 2126.

References

Illustrations

Worked examples

Example 1 — a first encounter with NGC 2126

Start with the simplest possible case. Write down what NGC 2126 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 2126 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 2126 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 2126

In research: NGC 2126 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 2126 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 2126 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Auriga, NGC objects, Open clusters, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 2126 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 2126 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 2126 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 2126 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 2126 in simple terms?

NGC 2126 is a moderately rich open cluster of stars in the northern constellation of Auriga. It was discovered on November 12, 1787 by German-British astronomer William Herschel.

Why does NGC 2126 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 2126?

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 2126.