astronomy

HD 111456

HD 111456 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 111456 rather than just read about it. In short: HD 111456 is a yellow-white hued star in the northern circumpolar constellation of Ursa Major. It is dimly visible to the naked eye, having an apparent visual magnitude of 5.85.

Key takeaways

HD 111456 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 111456 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 111456 from memory before moving on to harder problems.

Reference excerpt

HD 111456 is a yellow-white hued star in the northern circumpolar constellation of Ursa Major. It is dimly visible to the naked eye, having an apparent visual magnitude of 5.85. Based upon an annual parallax shift of 38.2 mas as seen from Earth, it is located about 85 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −18 km/s. HD 111456 is a nucleus cluster member of the Ursa Major Moving Group, a set of stars that are moving through space with a similar heading and velocity. Six other stars in the nucleus of the group are prominent members of the Big Dipper asterism. The stellar classification for this star is F7 V, indicating that it is an ordinary F-type main-sequence star. It is young, around 300−400 million years of age, and is spinning with a relatively high projected rotational velocity of 41.5 km/s. This is one of the most active F-type stars known, and it is a strong emitter of X-rays and an extreme UV source. It is an astrometric binary with a period of four years and a mass ratio of 0.5. Hence, the companion may be a young white dwarf star.

References

Worked examples

Example 1 — a first encounter with HD 111456

Start with the simplest possible case. Write down what HD 111456 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 111456 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 111456 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 111456

In research: HD 111456 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 111456 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 111456 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 111456 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 111456 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 111456 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 111456 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 111456 in simple terms?

HD 111456 is a yellow-white hued star in the northern circumpolar constellation of Ursa Major. It is dimly visible to the naked eye, having an apparent visual magnitude of 5.85.

Why does HD 111456 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 111456?

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 111456.