astronomy

Kappa Coronae Borealis

Kappa Coronae Borealis 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 Kappa Coronae Borealis rather than just read about it. In short: Kappa Coronae Borealis is a star in the northern constellation of Corona Borealis. Its name is a Bayer designation that is Latinized from κ Coronae Borealis, and abbreviated Kappa CrB or κ CrB.

Key takeaways

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

Reference excerpt

Kappa Coronae Borealis is a star in the northern constellation of Corona Borealis. Its name is a Bayer designation that is Latinized from κ Coronae Borealis, and abbreviated Kappa CrB or κ CrB. The star is visible to the naked eye with an apparent visual magnitude of +4.82. Based on parallax measurements, it is located at a distance of 97.8 light-years (30.0 pc) from the Earth. The star is drifting closer to the Sun with a line of sight velocity component of −25 km/s. This is an evolved K-type star of spectral type K0 III-IV, meaning it has completely exhausted its hydrogen supply at its core. Around 2.5 billion years old, it was an A-type main sequence star. It is 1.32 times as massive as the Sun and has expanded to 4.8 times the Sun's radius. The star is radiating 11.6 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,870 K.

Dust disk In March 2013, it was announced that resolved images of at least one dust disk surrounding Kappa Coronae Borealis were captured, making it the first subgiant to host such circumstellar belt. The disk extends out from 50 AU to 180 AU, and there is an estimated 0.016 M🜨 of dust.

Planetary system In October 2007, a giant planet was found by Johnson et al., who used the radial velocity method. In 2012 it was confirmed. This planet was assumed to be outside the habitable zone on the assumption that the star is K1IVa. Given the star's luminosity, the planet is more likely on the zone's inner edge. The width of the circumstellar belt suggests the presence of a second planetary companion of the star, either within it or between two narrower belts.

Illustrations

Worked examples

Example 1 — a first encounter with Kappa Coronae Borealis

Start with the simplest possible case. Write down what Kappa Coronae Borealis 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 Kappa Coronae Borealis 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 Kappa Coronae Borealis 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 Kappa Coronae Borealis

In research: Kappa Coronae Borealis 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 Kappa Coronae Borealis 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: Kappa Coronae Borealis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bayer objects, Bright Star Catalogue objects, Circumstellar disks, so understanding it makes those chapters shorter.
In everyday life: Look for Kappa Coronae Borealis 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 Kappa Coronae Borealis in 20 minutes

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

Frequently asked questions

What is Kappa Coronae Borealis in simple terms?

Kappa Coronae Borealis is a star in the northern constellation of Corona Borealis. Its name is a Bayer designation that is Latinized from κ Coronae Borealis, and abbreviated Kappa CrB or κ CrB.

Why does Kappa Coronae Borealis 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 Kappa Coronae Borealis?

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 Kappa Coronae Borealis.