astronomy

Iota Persei

Iota Persei 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 Iota Persei rather than just read about it. In short: ι Persei, Latinized as Iota Persei, is a single star in the northern constellation Perseus. This object is visible to the naked eye as a faint, yellow-white hued point of light with an apparent visual magnitude of 4.1.

Key takeaways

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

Reference excerpt

ι Persei, Latinized as Iota Persei, is a single star in the northern constellation Perseus. This object is visible to the naked eye as a faint, yellow-white hued point of light with an apparent visual magnitude of 4.1. It is located 34.5 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +49 km/s. Iota Persei has a relatively high proper motion across the sky.

This is a late F- or early G-type main-sequence star with a stellar classification of around G0V. It is about 3–4 billion years old and is spinning slowly with a projected rotational velocity of 4 km/s. The star has 1.1 times the mass of the Sun and 1.4 times the Sun's radius. It is radiating more than double the luminosity of the Sun from its photosphere at an effective temperature of 5,921 K. There is a 12.4-magnitude line-of-sight companion star that is not believed to be gravitationally associated with Iota Persei. This object is located at an angular separation of 154.4″ from the primary along a position angle of 125°, as of 2014.

Naming In Chinese, 大陵 (Dà Líng), meaning Mausoleum, refers to an asterism consisting of ι Persei, 9 Persei, τ Persei, κ Persei, β Persei, ρ Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for ι Persei itself is 大陵三 (Dà Líng sān, English: the Third Star of Mausoleum).

References

External links "Iota Persei". SolStation. Archived from the original on February 11, 2004. Retrieved 2006-07-25. "Gl 124". ARICNS. Retrieved 2006-07-25. "Iota Per". Prof. Jim Kaler. Retrieved 2006-07-25.

Illustrations

Worked examples

Example 1 — a first encounter with Iota Persei

Start with the simplest possible case. Write down what Iota Persei 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 Iota Persei 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 Iota Persei 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 Iota Persei

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

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

Frequently asked questions

What is Iota Persei in simple terms?

Why does Iota Persei 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 Iota Persei?

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 Iota Persei.