astronomy

HD 164712

HD 164712 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 164712 rather than just read about it. In short: HD 164712, also known as HR 6731, is an orange hued star located in the southern constellation of Apus. It has an apparent magnitude of 5.86, making it faintly visible to the naked eye if viewed under ideal conditions.

Key takeaways

HD 164712 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 164712 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 164712 from memory before moving on to harder problems.

Reference excerpt

HD 164712, also known as HR 6731, is an orange hued star located in the southern constellation of Apus. It has an apparent magnitude of 5.86, making it faintly visible to the naked eye if viewed under ideal conditions. Parallax measurements place the object at a distance of 229 light-years (70 pc), and it is currently receding with a heliocentric radial velocity of 14.8 km/s. HD 164712 has a stellar classification of K2 III, indicating that it is a red giant. David Stanley Evans gave it a slightly cooler class of K3 III. Gaia Data Release 3 models place it on the bump of red giant branch, a period of temporary contraction. At present it has 1.15 times the mass of the Sun but at an age of 4.54 billion years, it has expanded to 9.09 times its girth. It shines with a luminosity of 33.1 L☉ from its enlarged photosphere at an effective temperature of 4,360 K. HD 164712 is a thick disk star with an iron abundance 73% above solar level. This makes it metal enriched. Like most giants, it spins slowly, with its projected rotational velocity being lower than 1.5 km/s. HR 6731 has two faint companions. Component B is a 13th magnitude object separated 24.6″ away along a position angle of 299°. Component C is a 14th magnitude star 18.1″ away along a position angle of 109°. The first one is a background object while the other one appears to be physically related. As for HD 164712, it shows indications of an infrared excess, suggesting there may be a dusty disk in orbit around the star.

References

External links Image HD 164712

Worked examples

Example 1 — a first encounter with HD 164712

Start with the simplest possible case. Write down what HD 164712 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 164712 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 164712 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 164712

In research: HD 164712 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 164712 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 164712 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Apus, Bright Star Catalogue objects, Double stars, so understanding it makes those chapters shorter.
In everyday life: Look for HD 164712 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 164712 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 164712 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 164712 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 164712 in simple terms?

Why does HD 164712 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 164712?

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 164712.