astronomy

Tau Cassiopeiae

Tau 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 Tau Cassiopeiae rather than just read about it. In short: Tau Cassiopeiae is a solitary, orange hued star in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from τ Cassiopeiae, and abbreviated Tau Cas or τ Cas.

Key takeaways

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

Reference excerpt

Tau Cassiopeiae is a solitary, orange hued star in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from τ Cassiopeiae, and abbreviated Tau Cas or τ Cas. This star is bright enough to be seen with the naked eye, having an apparent visual magnitude of +4.86. Based upon an annual parallax shift of 18.78 mas as seen from Earth, this star is located about 173.7 light-years (53.3 pc) from the Sun. It is drifting closer with a radial velocity of −20 km/s. The spectrum of this star indicates it is an evolved, K-type giant star with a stellar classification of K1 IIIa. It is a suspected variable star of unknown type. Tau Cassiopeiae is 3.9 billion years old with about 1.44 times the mass of the Sun and 10 times the Sun's radius. It is radiating 40 times the Sun's luminosity from its expanded photosphere at an effective temperature of around 4,617 K.

Naming In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of τ Cassiopeiae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, the Chinese name for τ Cassiopeiae itself is 螣蛇十三 (Téng Shé shísān, English: the Thirteenth Star of Flying Serpent).

References

Illustrations

Worked examples

Example 1 — a first encounter with Tau Cassiopeiae

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

In research: Tau 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 Tau 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: Tau Cassiopeiae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bayer objects, Bright Star Catalogue objects, Cassiopeia (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for Tau 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 Tau Cassiopeiae in 20 minutes

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

Frequently asked questions

What is Tau Cassiopeiae in simple terms?

Tau Cassiopeiae is a solitary, orange hued star in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from τ Cassiopeiae, and abbreviated Tau Cas or τ Cas.

Why does Tau 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 Tau 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 Tau Cassiopeiae.