astronomy

Omicron1 Eridani

Omicron1 Eridani 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 Omicron1 Eridani rather than just read about it. In short: Omicron1 Eridani (ο1 Eridani, abbreviated Omicron1 Eri, ο1 Eri), also named Beid , is a variable star in the constellation of Eridanus. With an average apparent visual magnitude of around 4.0, it is visible to the naked eye on a clear, dark night.

Key takeaways

Omicron1 Eridani belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Omicron1 Eridani to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Omicron1 Eridani from memory before moving on to harder problems.

Reference excerpt

Omicron1 Eridani (ο1 Eridani, abbreviated Omicron1 Eri, ο1 Eri), also named Beid , is a variable star in the constellation of Eridanus. With an average apparent visual magnitude of around 4.0, it is visible to the naked eye on a clear, dark night. Based upon parallax measurements, it lies approximately 122 light-years from the Sun.

Nomenclature

ο1 Eridani (Latinised to Omicron1 Eridani) is the star's Bayer designation. The system bears the traditional name Beid derived from the Arabic word بيض bayḍ meaning "eggs" (cf. neighboring Keid "(egg)shells"). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Beid for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names. In Chinese, 九州殊口 (Jiǔ Zhōu Shū Kǒu), meaning Interpreters of Nine Dialects, refers to an asterism consisting of ο1 Eridani, 39 Eridani, Xi Eridani, Nu Eridani, 56 Eridani and 55 Eridani. Consequently, the Chinese name for Omicron1 Eridani itself is 九州殊口二 (Jiǔ Zhōu Shū Kǒu èr, English: the Second Star of Interpreters of Nine Dialects).

Properties ο1 Eridani is an evolved F-type giant star with a stellar classification of F0 III. It is a Delta Scuti variable star that undergoes non-radial pulsations, with a variation of just 0.03 magnitude over a period of 0.0747 days. The star is spinning rapidly with a projected rotational velocity of 108.1 km/s and a rotation period of less than around 1.9 days. This is creating an equatorial bulge that is 11% wider than the polar radius. Omicron1 Eridani has nearly double the mass of the Sun, 3.7 times the Sun's radius, and shines with 27 times the solar luminosity from an outer atmosphere at an effective temperature of 6,963 K.

References

External links Kaler, James B. (January 13, 2012), "Beid", Stars, University of Illinois, retrieved 2016-10-11.

Illustrations

Worked examples

Example 1 — a first encounter with Omicron1 Eridani

Start with the simplest possible case. Write down what Omicron1 Eridani 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 Omicron1 Eridani 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 Omicron1 Eridani 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 Omicron1 Eridani

In research: Omicron1 Eridani 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 Omicron1 Eridani 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: Omicron1 Eridani is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bayer objects, Bright Star Catalogue objects, Delta Scuti variables, so understanding it makes those chapters shorter.
In everyday life: Look for Omicron1 Eridani 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 Omicron1 Eridani in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Omicron1 Eridani 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 Omicron1 Eridani out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Omicron1 Eridani in simple terms?

Why does Omicron1 Eridani 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 Omicron1 Eridani?

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 Omicron1 Eridani.