astronomy

HD 154345 b

HD 154345 b 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 154345 b rather than just read about it. In short: HD 154345 b is a Jupiter-mass extrasolar planet orbiting the star HD 154345. Discovery Wright et al. discovered the planet in March 2006 using the radial velocity method to detect the small wobbling movement of the star caused by the gravity of the planet.

Key takeaways

HD 154345 b 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 154345 b to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 154345 b from memory before moving on to harder problems.

Reference excerpt

HD 154345 b is a Jupiter-mass extrasolar planet orbiting the star HD 154345.

Discovery Wright et al. discovered the planet in March 2006 using the radial velocity method to detect the small wobbling movement of the star caused by the gravity of the planet. The discovery was published in May 2007. While the existence of HD 154345 b has been unclear due to the correlation of its orbital period with the star's activity cycle, a study in 2021 further confirmed its planetary nature. In 2023, the inclination and true mass of HD 154345 b were determined via astrometry.

Characteristics The planet has a mass slightly greater than that of Jupiter. It orbits its parent star at a distance of 4.18 AU. Its orbital period is about 9.15 Earth years and its orbit is near-circular. There are no interior planets of minimum mass (m sini) greater than 0.3 Jupiter. Jupiter-like planets with these orbital and system characteristics are unlikely to be perturbed from the star's inclination. Since the star's inclination is known as around 50°, this would make the planet's most likely mass greater than Jupiter's mass but less than twice that mass. As such HD 154345 b is presumed to be a gas giant "Jupiter twin". Depending on composition the two planets may be around the same size, or HD 154345 b may be larger. This planet may also harbor a system of moons and rings.

See also HIP 11915 b, another "Jupiter twin" exoplanet.

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 154345 b

Start with the simplest possible case. Write down what HD 154345 b 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 154345 b 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 154345 b 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 154345 b

In research: HD 154345 b 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 154345 b 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 154345 b is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanets detected by astrometry, Exoplanets detected by radial velocity, Exoplanets discovered in 2006, so understanding it makes those chapters shorter.
In everyday life: Look for HD 154345 b 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 154345 b in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 154345 b 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 154345 b out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 154345 b in simple terms?

HD 154345 b is a Jupiter-mass extrasolar planet orbiting the star HD 154345. Discovery Wright et al. discovered the planet in March 2006 using the radial velocity method to detect the small wobbling movement of the star caused by the gravity of the planet.

Why does HD 154345 b 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 154345 b?

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 154345 b.