astronomy

HD 108147

HD 108147 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 108147 rather than just read about it. In short: HD 108147, also known as Tupã, is a 7th magnitude star in the constellation of Crux in direct line with and very near to the bright star Acrux or Alpha Crucis. It is either a yellow-white or yellow dwarf (the line is arbitrary and the colour difference is only from classification, not real), slightly brighter and more massive than the Sun.

Key takeaways

HD 108147 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 108147 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 108147 from memory before moving on to harder problems.

Reference excerpt

HD 108147, also known as Tupã, is a 7th magnitude star in the constellation of Crux in direct line with and very near to the bright star Acrux or Alpha Crucis. It is either a yellow-white or yellow dwarf (the line is arbitrary and the colour difference is only from classification, not real), slightly brighter and more massive than the Sun. The spectral type is F8 V or G0 V. The star is also younger than the Sun. Due to its distance of 127 light-years, it is too dim to be visible with the unaided eye; with binoculars it is an easy target. However, due to its southerly location it is not visible in the northern hemisphere except for the tropics. An extrasolar planet was detected orbiting it in 2000 by the Geneva Extrasolar Planet Search Team. This exoplanet is "a gas giant smaller than Jupiter that orbits very tightly around its primary [star] in 11 days at only 0.1 AU." This is much closer than the orbit of Mercury in the Solar System. In December 2019, the International Astronomical Union announced the star will bear the name Tupã, after the God of the Guarani peoples of Paraguay. The name was a result of a contest ran in Paraguay by the Centro Paraguayo de Informaciones Astronómicas, along with the IAU100 NameExoWorlds 2019 global contest. It should not be confused with HD 107148, which also has an extrasolar planet discovered in 2006 in the Virgo constellation.

Illustrations

Worked examples

Example 1 — a first encounter with HD 108147

Start with the simplest possible case. Write down what HD 108147 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 108147 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 108147 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 108147

In research: HD 108147 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 108147 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 108147 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Crux, Durchmusterung objects, F-type main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for HD 108147 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 108147 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 108147 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 108147 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 108147 in simple terms?

Why does HD 108147 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 108147?

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 108147.