astronomy

HD 12055

HD 12055 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 12055 rather than just read about it. In short: HD 12055 is a candidate astrometric binary star system in the southern constellation of Phoenix, near the eastern constellation border with Eridanus. It is yellow in hue and is visible to the naked eye with an apparent visual magnitude of 4.82.

Key takeaways

HD 12055 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 12055 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 12055 from memory before moving on to harder problems.

Reference excerpt

HD 12055 is a candidate astrometric binary star system in the southern constellation of Phoenix, near the eastern constellation border with Eridanus. It is yellow in hue and is visible to the naked eye with an apparent visual magnitude of 4.82. The system is located at a distance of approximately 249 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +13 km/s. The visible component is an aging giant star with a stellar classification of G6III-IIIb. With the supply of hydrogen at its core exhausted, the star has cooled and expanded off the main sequence – at present it has ten times the girth of the Sun. It is around a billion years old with 2.4 times the mass of the Sun and is spinning with a projected rotational velocity of 6 km/s. The star is radiating 71 times the luminosity of the Sun from its photosphere at an effective temperature of 5,196 K. This system is the most likely source of X-ray emission coming from these coordinates.

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 12055

Start with the simplest possible case. Write down what HD 12055 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 12055 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 12055 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 12055

In research: HD 12055 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 12055 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 12055 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astrometric binaries, Bright Star Catalogue objects, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 12055 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 12055 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 12055 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 12055 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 12055 in simple terms?

Why does HD 12055 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 12055?

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 12055.