astronomy

HD 166006

HD 166006 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 166006 rather than just read about it. In short: HD 166006, also known as HR 6778, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.07, making it barely visible to the naked eye.

Key takeaways

HD 166006 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 166006 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 166006 from memory before moving on to harder problems.

Reference excerpt

HD 166006, also known as HR 6778, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.07, making it barely visible to the naked eye. Based on Gaia DR2 parallax measurements, the object is located 582 light years away. It is currently approaching the Solar System with a somewhat constrained heliocentric radial velocity of −15 km/s. HD 166006 has a stellar classification of K1 III CN2, which indicates that it is an evolved red giant with a strong overabundance of cyano radicals in its spectrum, making it a CN star. At the estimated distance of HD 166006, the star has an angular diameter of 1.05 mas. This yields a radius of 20.1 R☉. It has 1.24 times the mass of the Sun and radiates 165 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,529 K. The star is slightly metal deficient ([Fe/H] = −0.07) and spins a little too slowly to be accurately measured.HD 166006 has an optical 11th magnitude companion located 1.8" away along a position angle of 271° as of 2015.

References

Worked examples

Example 1 — a first encounter with HD 166006

Start with the simplest possible case. Write down what HD 166006 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 166006 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 166006 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 166006

In research: HD 166006 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 166006 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 166006 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bright Star Catalogue objects, Double stars, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 166006 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 166006 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 166006 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 166006 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 166006 in simple terms?

HD 166006, also known as HR 6778, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.07, making it barely visible to the naked eye.

Why does HD 166006 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 166006?

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 166006.