astronomy

HD 111031

HD 111031 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 111031 rather than just read about it. In short: HD 111031 (50 G. Corvi) is a double star in the southern constellation of Corvus.

Key takeaways

HD 111031 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 111031 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 111031 from memory before moving on to harder problems.

Reference excerpt

HD 111031 (50 G. Corvi) is a double star in the southern constellation of Corvus. With an apparent visual magnitude of 6.87, it is considered too faint to be readily visible to the naked eye. The distance to this star is 102 light years, but it is drifting closer to the Sun with a radial velocity of −20 km/s. It has an absolute magnitude of 4.42. The star has a relatively large proper motion, traversing the celestial sphere at an angular rate of 0.289 arcsec yr−1. This object is a solar analog with a stellar classification of G5 V; a G-type main-sequence star like the Sun that is generating energy through core hydrogen fusion. It is around five billion years old and is chromospherically inactive, with a projected rotational velocity of 1.7 km/s. The star has 1.0 times the mass and 1.25 times the radius of the Sun. It is radiating 1.5 times the Sun's luminosity from its photosphere at an effective temperature of 5,725 K. In 2020, a stellar companion was identified using high-contrast imaging. The study authors deem this most likely a K-type main-sequence star with a class of K5V, an angular separation of 1″ along a position angle (PA) of 300° corresponding to a projected separation of 30 AU, and around 11–15% of the mass of the Sun. An independent study published in 2021 identified a companion through speckle imaging. They propose this is a faint red dwarf with a class of M6 or later and a visual magnitude difference of 7.9 or more compared to the primary. It is located at a separation of 1.06″ along a PA of 121°, as of 2021. A 2022 study claimed the presence of a brown dwarf companion to this star based on radial velocity and astrometry observations, but according to a 2023 follow-up study this was in fact a detection of the previously known stellar companion, poorly characterized due to the baseline of observations being much shorter than the companion's orbital period.

References

Worked examples

Example 1 — a first encounter with HD 111031

Start with the simplest possible case. Write down what HD 111031 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 111031 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 111031 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 111031

In research: HD 111031 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 111031 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 111031 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Corvus (constellation), Double stars, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 111031 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 111031 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 111031 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 111031 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 111031 in simple terms?

HD 111031 (50 G. Corvi) is a double star in the southern constellation of Corvus.

Why does HD 111031 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 111031?

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 111031.