astronomy

Gliese 282

Gliese 282 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 282 rather than just read about it. In short: Gliese 282 is a star system composed of four stars in the equatorial constellation of Monoceros. At a distance of 46 light years, this star has an apparent magnitude of 7.26 when viewed from Earth.

Key takeaways

Gliese 282 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 282 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gliese 282 from memory before moving on to harder problems.

Reference excerpt

Gliese 282 is a star system composed of four stars in the equatorial constellation of Monoceros. At a distance of 46 light years, this star has an apparent magnitude of 7.26 when viewed from Earth. It is not visible to the naked eye. The Gl 282AB star system is composed of two K- type main-sequence stars. The primary component, Gliese 282A, is a BY Draconis type variable star with a stellar classification of K2V. It has an effective temperature of 4,956 K. The companion, Gliese 282B, is a smaller, class K5V star. As of 2003, the pair had an angular separation of 58.30 arc seconds along a position angle of 113°. This is equivalent to a projected physical separation of 824 AU. There is a distant common proper motion companion (G 112-29) at an angular separation of 1.09°. At the estimated distance of Gl 282AB, this corresponds to a projected separation of 55,733 AU (0.88128 light-years), making it one of the widest known physical companions. Initially believed to be a red dwarf star with a stellar classification of M1.5Ve, it turned out to be a pair of red dwarfs (Ca and Cb) with masses 0.55M☉ and 0.19M☉, orbiting each other on 6591+136−177 days orbit.

References

External links University of Hamburg. "NEXXUS - The database for Nearby X-ray and extreme UV emitting Stars". Retrieved 21 May 2012. University of Hamburg. "NEXXUS - The database for Nearby X-ray and extreme UV emitting Stars". Retrieved 21 May 2012. "K stars within 100 light-years". SolStation. Archived from the original on 24 December 2017. Retrieved 26 May 2012.

Worked examples

Example 1 — a first encounter with Gliese 282

Start with the simplest possible case. Write down what Gliese 282 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 282 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 282 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 282

In research: Gliese 282 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 282 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 282 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Gliese and GJ objects, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for Gliese 282 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 282 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gliese 282 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 282 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gliese 282 in simple terms?

Gliese 282 is a star system composed of four stars in the equatorial constellation of Monoceros. At a distance of 46 light years, this star has an apparent magnitude of 7.26 when viewed from Earth.

Why does Gliese 282 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 282?

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 282.