astronomy

Pi Coronae Borealis

Pi 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 Pi Coronae Borealis rather than just read about it. In short: Pi Coronae Borealis is a solitary, orange-hued star in the northern constellation of Corona Borealis. It has the proper name Stephanos; Pi Coronae Borealis is its Bayer designation, which is Latinized from π Coronae Borealis and abbreviated Pi CrB or π CrB.

Key takeaways

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

Reference excerpt

Pi Coronae Borealis is a solitary, orange-hued star in the northern constellation of Corona Borealis. It has the proper name Stephanos; Pi Coronae Borealis is its Bayer designation, which is Latinized from π Coronae Borealis and abbreviated Pi CrB or π CrB. The star has an apparent visual magnitude of 5.58, which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 12.60 mas as measured from Earth, it is located at a distance of about 258.9 light-years (79.4 pc) from the Sun. The star is moving closer to the Sun with a radial velocity of −5 km/s. It is most likely (98% chance) a member of the thin disk population. This is an evolved G-type giant star with a stellar classification of G9 III:, where the ':' indicates some uncertainty about the classification. (Bartkevicius and Lazauskaite (1997) classify it as K0 III.) The star has 1.61 times the mass of the Sun and has expanded to about 10 times the Sun's radius. The abundance of iron is lower than in the Sun: the star is considered metal deficient. It is a red clump giant, fusing helium in its core. It is around 4.6 billion years old and is radiating 39 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,667 K. Stephanos (Στέφανος), the wreath, is the ancient Greek name of Corona Borealis. The IAU Working Group on Star Names adopted the name Stephanos for this star on 14 May 2026.

References

Illustrations

Worked examples

Example 1 — a first encounter with Pi Coronae Borealis

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

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

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

Frequently asked questions

What is Pi Coronae Borealis in simple terms?

Why does Pi 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 Pi 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 Pi Coronae Borealis.