astronomy

HD 143811

HD 143811 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 143811 rather than just read about it. In short: HD 143811 is a spectroscopic binary system in the constellation Lupus. Its apparent magnitude is 8.91, too faint to be visible with the naked eye.

Key takeaways

HD 143811 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 143811 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 143811 from memory before moving on to harder problems.

Reference excerpt

HD 143811 is a spectroscopic binary system in the constellation Lupus. Its apparent magnitude is 8.91, too faint to be visible with the naked eye. Based on parallax measurements from the Gaia spacecraft, it is located at a distance of 446 light-years (137 parsecs). The system is a member of the Scorpius–Centaurus association, and has an estimated age of 21 million years. The two stellar components are a bit more massive and hotter than the Sun. They take 18.59 days to orbit each other, and have an unusually eccentric orbit for such a short orbital period. HD 143811 has a debris disk located at 8.5 astronomical units, with an estimated temperature of 140 K (−133 °C), and is orbited by one known exoplanet, at 63 au.

Planetary system In 2025, two independent teams found a planet orbiting the system using the direct imaging technique. One used the Gemini Planet Imager and the NIRC-2 camera aboard the Keck telescope, while the other used the SPHERE instrument aboard the Very Large Telescope and the Gemini Planet Imager. Additionally, its existence was inferred using astrometry. The planet, named HD 143811 b, is a gas giant with 6.1 times the mass of Jupiter (MJ), 1.4 to 1.7 times Jupiter's radius (RJ), and a temperature of 1,000±30 K. It has a circumbinary orbit, having a semi-major axis of 63 astronomical units, and an orbital period of roughly 300 years.

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 143811

Start with the simplest possible case. Write down what HD 143811 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 143811 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 143811 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 143811

In research: HD 143811 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 143811 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 143811 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, F-type main-sequence stars, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 143811 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 143811 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 143811 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 143811 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 143811 in simple terms?

HD 143811 is a spectroscopic binary system in the constellation Lupus. Its apparent magnitude is 8.91, too faint to be visible with the naked eye.

Why does HD 143811 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 143811?

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 143811.