astronomy

HD 166114

HD 166114 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 HD 166114 rather than just read about it. In short: HD 166114, also known as HR 6786 or rarely 2 G. Coronae Australis, is a solitary, yellowish-white hued star located in the southern constellation Corona Australis.

Key takeaways

HD 166114 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HD 166114 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 166114 from memory before moving on to harder problems.

Reference excerpt

HD 166114, also known as HR 6786 or rarely 2 G. Coronae Australis, is a solitary, yellowish-white hued star located in the southern constellation Corona Australis. It has an apparent magnitude of 5.85, making it faintly visible to the naked eye under ideal conditions. The object is located relatively close at a distance of 264 light-years based on Gaia DR3 parallax measurements, and it is currently approaching the Solar System with a poorly constrained heliocentric radial velocity of −4 km/s. At its current distance, HD 166114's brightness is diminished by an extinction of 0.31 magnitudes and it has an absolute magnitude of +1.28. HD 166114 has a stellar classification of either F2 V or F0 Vn—both indicating that it is a F-type main-sequence star. The second class also displays a presence of nebulous or broad absorption lines due to rapid rotation. Abt and Morell (1995) give a class of A8 IV, instead indicating that it is a slightly evolved A-type subgiant. Gaia DR3 models it to be a rather evolved main sequence star. The object has 1.68 times the mass of the Sun and a slightly enlarged radius of 3.14 R☉. It radiates 25.6 times the luminosity of the Sun from its photosphere at an effective temperature of 7,465 K. HD 166114 is slightly metal deficient with an iron abundance 81% that of the Sun ([Fe/H] = −0.09) and it is estimated to be 1.2 billion years old.

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 166114

Start with the simplest possible case. Write down what HD 166114 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 HD 166114 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 HD 166114 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 HD 166114

In research: HD 166114 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 HD 166114 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: HD 166114 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bright Star Catalogue objects, Corona Australis, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 166114 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 HD 166114 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 166114 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 HD 166114 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 166114 in simple terms?

HD 166114, also known as HR 6786 or rarely 2 G. Coronae Australis, is a solitary, yellowish-white hued star located in the southern constellation Corona Australis.

Why does HD 166114 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 HD 166114?

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 HD 166114.