astronomy

Kappa Cassiopeiae

Kappa Cassiopeiae 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 Cassiopeiae rather than just read about it. In short: Kappa Cassiopeiae, also named Cexing, is a star in the constellation Cassiopeia. Its name is a Bayer designation that is Latinized from κ Cassiopeiae, and abbreviated Kappa Cas or κ Cas.

Key takeaways

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

Reference excerpt

Kappa Cassiopeiae, also named Cexing, is a star in the constellation Cassiopeia. Its name is a Bayer designation that is Latinized from κ Cassiopeiae, and abbreviated Kappa Cas or κ Cas. This is a variable star of 4th magnitude, indicating it is visible to the naked eye. κ Cassiopeiae is assumed to be a member of the Cassiopeia OB14 stellar association (Cas OB14) and treated as being at a distance of about 1,100 pc, while its distance found from the Gaia parallax measurement is about 4,600 light-years (1,400 pc). A 2020 determination of the distance to Cas OB14 is 880 pc.

Nomenclature Kappa Cassiopeiae (Latinized from κ Cassiopeiae) is the star's Bayer designation. In Chinese astronomy, κ Cassiopeiae is associated with the asterism Wáng Liáng (王良), representing a legendary charioteer from the Spring and Autumn period. It was originally identified as Cè (策), the charioteer's whip, but this name was later transferred to γ Cassiopeiae, with κ Cassiopeiae becoming one of the charioteer's four horses. The IAU Working Group on Star Names approved the name Cexing for κ Cassiopeiae on 13 November 2025 and it is now so entered in the IAU Catalog of Star Names; xing means star, and this form of the name was already used in ancient times.

Properties

κ Cassiopeiae has an unusual spectrum that has anomalously weak nitrogen lines, taken as an actual nitrogen deficiency in the atmosphere. This is indicated by the modified letter C on the assumption that it is also carbon-rich, although this might not actually be the case. It is also interpolated to BC0.7, being slightly hotter than a standard B1 star. It is classified as an Alpha Cygni type variable star and its brightness varies by a few hundredths of a magnitude. Periods of two hours, 2.65 days, and nine days have been reported from observations at different times. It is a runaway star. Its magnetic field and wind of particles creates a visible bow shock 4 light-years ahead of it, colliding with the diffuse, and usually invisible, interstellar gas and dust. This is about the same distance that Earth is from Proxima Centauri, the nearest star to the Sun. The dimensions of the bow shock are vast: around 12 light-years long and 1.8 light-years wide.

References

Illustrations

Worked examples

Example 1 — a first encounter with Kappa Cassiopeiae

Start with the simplest possible case. Write down what Kappa Cassiopeiae 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 Cassiopeiae 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 Cassiopeiae 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 Cassiopeiae

In research: Kappa Cassiopeiae 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 Cassiopeiae 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 Cassiopeiae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alpha Cygni variables, B-type supergiants, Bayer objects, so understanding it makes those chapters shorter.
In everyday life: Look for Kappa Cassiopeiae 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 Cassiopeiae in 20 minutes

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

Frequently asked questions

What is Kappa Cassiopeiae in simple terms?

Kappa Cassiopeiae, also named Cexing, is a star in the constellation Cassiopeia. Its name is a Bayer designation that is Latinized from κ Cassiopeiae, and abbreviated Kappa Cas or κ Cas.

Why does Kappa Cassiopeiae 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 Cassiopeiae?

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 Cassiopeiae.