astronomy

Gliese 22

Gliese 22 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 Gliese 22 rather than just read about it. In short: Gliese 22, also catalogued V547 Cassiopeiae or ADS 440, is a hierarchical star system approximately 33 light-years (10.1 parsecs) away in the constellation of Cassiopeia. The system consists of pair of red dwarf stars, Gliese 22A and Gliese 22C, orbited by a third red dwarf Gliese 22B in an outer orbit of about 223 years.

Key takeaways

Gliese 22 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Gliese 22 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gliese 22 from memory before moving on to harder problems.

Reference excerpt

Gliese 22, also catalogued V547 Cassiopeiae or ADS 440, is a hierarchical star system approximately 33 light-years (10.1 parsecs) away in the constellation of Cassiopeia. The system consists of pair of red dwarf stars, Gliese 22A and Gliese 22C, orbited by a third red dwarf Gliese 22B in an outer orbit of about 223 years. The discovery of flare activity on Gliese 22A was announced by Bjørn Ragnvald Pettersen in 1975, which led to it being given a variable star designation, V547 Cassiopeiae, in 1977.

Planetary system As of 2008, it was announced that a possible extrasolar planet, Gliese 22B b, orbits Gliese 22B but this is currently unconfirmed. The study in 2011 has indicated the orbit of the purported planet is stable.

References

External links "Descoberta de novo planeta gigante extrasolar". Universia (in Spanish). 2008-03-16. Archived from the original on 2008-10-17. Retrieved 2008-08-10. "Notes for star Gliese 22 B". Extrasolar Planets Encyclopaedia. Archived from the original on 2008-10-23. Retrieved 2008-08-10.

Illustrations

Worked examples

Example 1 — a first encounter with Gliese 22

Start with the simplest possible case. Write down what Gliese 22 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 Gliese 22 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 Gliese 22 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 Gliese 22

In research: Gliese 22 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 Gliese 22 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: Gliese 22 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Binary stars, Brown dwarf stubs, Brown dwarfs, so understanding it makes those chapters shorter.
In everyday life: Look for Gliese 22 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 Gliese 22 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gliese 22 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 Gliese 22 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gliese 22 in simple terms?

Why does Gliese 22 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 Gliese 22?

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 Gliese 22.