astronomy

HD 148156

HD 148156 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 148156 rather than just read about it. In short: HD 148156 is a star with an orbiting exoplanet in the southern constellation of Norma. It is located at a distance of 186 light years away from the Sun, but is drifting closer with a radial velocity of –1.8 km/s.

Key takeaways

HD 148156 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 148156 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 148156 from memory before moving on to harder problems.

Reference excerpt

HD 148156 is a star with an orbiting exoplanet in the southern constellation of Norma. It is located at a distance of 186 light years away from the Sun, but is drifting closer with a radial velocity of –1.8 km/s. The star has an apparent visual magnitude of 7.69, which is too dim to be visible to the naked eye. A survey in 2015 ruled out the existence of any stellar companions at projected distances from 49 to 345 astronomical units. The spectrum of this star presents as an ordinary G-type main-sequence star with a stellar classification of G0/2V, although Naef and associates in 2010 listed a similar class of F8V. A solar-type star, it is estimated to be approximately 1.2 billion years old and is spinning with a projected rotational velocity of 6 km/s. There is only a very low level of magnetic activity in the star's chromosphere. Its metallicity, as measured by the abundance of iron, is almost twice solar. The star has 1.2 times the mass and 1.2 to 1.3 times the radius of the Sun. It is radiating 1.84 to 2.28 times the luminosity of the Sun from its photosphere at an effective temperature of 6,156 K.

Planetary system In 2009, a gas giant planet was found in an eccentric orbit around the star. It may be orbiting within the habitable zone of this star based on incident flux.

Worked examples

Example 1 — a first encounter with HD 148156

Start with the simplest possible case. Write down what HD 148156 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 148156 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 148156 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 148156

In research: HD 148156 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 148156 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 148156 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 148156 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “HD 148156” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study HD 148156 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 148156 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 148156 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 148156 in simple terms?

Why does HD 148156 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 148156?

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 148156.