astronomy

HD 149143

HD 149143 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 149143 rather than just read about it. In short: HD 149143, also called Rosalíadecastro, is a star with a close orbiting exoplanet in the Ophiuchus constellation. Its apparent visual magnitude is 7.89 (a binocular object) and the absolute magnitude is 3.87.

Key takeaways

HD 149143 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 149143 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 149143 from memory before moving on to harder problems.

Reference excerpt

HD 149143, also called Rosalíadecastro, is a star with a close orbiting exoplanet in the Ophiuchus constellation. Its apparent visual magnitude is 7.89 (a binocular object) and the absolute magnitude is 3.87. The system is located at a distance of 239 light-years from the Sun based on parallax measurements, and it is drifting further away with a radial velocity of 12 km/s. On December 17, 2019, as part of the IAU's NameExoWorlds project, the star HD 149143 was given the name Rosalíadecastro in honour of the Galician poet Rosalía de Castro, who was a significant figure of Galician culture and prominent writer in Galician overall, but in Spanish too, whose work often referenced the night and celestial objects. The exoplanet companion was named Riosar in honour of the Sar river in Galicia that was present in much of the literary work of the author Rosalía de Castro. This is a slightly evolved star with a stellar classification of G0 that is overluminous for a high-metallicity G-type dwarf. It has 1.1 times the mass of the Sun and 1.3 times the Sun's radius. The star has an estimated age of around 7.6 billion years and is spinning with a projected rotational velocity of 3.9 km/s. It is radiating 2.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,213 K.

Planetary system HD 149143 b, the planet that orbits HD 149143, was discovered by the N2K Consortium during their search for short-period gas giant planets around metal-rich stars. The planet was independently discovered by the Elodie metallicity-biased search for transiting Hot Jupiters.

Worked examples

Example 1 — a first encounter with HD 149143

Start with the simplest possible case. Write down what HD 149143 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 149143 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 149143 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 149143

In research: HD 149143 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 149143 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 149143 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, G-type main-sequence stars, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 149143 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 149143 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 149143 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 149143 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 149143 in simple terms?

Why does HD 149143 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 149143?

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 149143.