astronomy

HD 125595

HD 125595 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 125595 rather than just read about it. In short: HD 125595 is a star with a close Neptunian companion in the southern constellation of Centaurus. With an apparent visual magnitude of 9.03, this star is too faint to be viewed with the naked eye.

Key takeaways

HD 125595 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 125595 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 125595 from memory before moving on to harder problems.

Reference excerpt

HD 125595 is a star with a close Neptunian companion in the southern constellation of Centaurus. With an apparent visual magnitude of 9.03, this star is too faint to be viewed with the naked eye. It is located at a distance of 92 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of +4.5 km/s. The star has a high proper motion, traversing the celestial sphere and an angular rate of 0.57 arcsecond yr−1. This is an ordinary K-type main-sequence star with a stellar classification of K4V(k), which indicates it is a small star that is generating energy at its core through hydrogen fusion. It is about eight billion years old and is spinning with a projected rotational velocity of 1.5 km/s, giving it a 37 day rotation period. The star shows a moderate level of chromospherically activity due to star spots or plagues. It is smaller, cooler, dimmer, and less massive than the Sun, but shows a higher atmospheric metallicity.

Planetary system In 2018 an exoplanet companion was announced by the HARPS program, using the radial velocity method. It is a Neptune-mass object orbiting 0.081 AU (12.1 Gm) from the host star with a period of 9.7 days.

Worked examples

Example 1 — a first encounter with HD 125595

Start with the simplest possible case. Write down what HD 125595 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 125595 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 125595 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 125595

In research: HD 125595 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 125595 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 125595 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Centaurus, Durchmusterung objects, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 125595 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 125595 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 125595 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 125595 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 125595 in simple terms?

HD 125595 is a star with a close Neptunian companion in the southern constellation of Centaurus. With an apparent visual magnitude of 9.03, this star is too faint to be viewed with the naked eye.

Why does HD 125595 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 125595?

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 125595.