astronomy

HD 109246

HD 109246 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 109246 rather than just read about it. In short: HD 109246, also named Funi, is a G-type main-sequence star in the constellation Draco. It is located 222 light-years from the Sun.

Key takeaways

HD 109246 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 109246 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 109246 from memory before moving on to harder problems.

Reference excerpt

HD 109246, also named Funi, is a G-type main-sequence star in the constellation Draco. It is located 222 light-years from the Sun. The star hosts one known exoplanet, which was discovered in 2010.

Nomenclature The designation HD 109246 comes from the Henry Draper Catalogue. This was one of the systems selected to be named in the 2019 NameExoWorlds campaign during the 100th anniversary of the IAU, which assigned each country a star and planet to be named. This system was assigned to Iceland. The approved names were Funi for the star, an old Icelandic word meaning fire or blaze, and Fold for the planet, meaning earth or soil.

Planetary system HD 109246 b (later named Fold) is a gas giant exoplanet. The discovery came from using the radial velocity method with SOPHIE spectrograph at the Haute-Provence Observatory. HD 109246 b holds a minimum mass of 0.77 Jupiter masses. It orbits every 68.27 days at a semi-major axis of 0.33 AU. The eccentricity is 0.12.

References

Worked examples

Example 1 — a first encounter with HD 109246

Start with the simplest possible case. Write down what HD 109246 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 109246 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 109246 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 109246

In research: HD 109246 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 109246 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 109246 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Draco (constellation), Durchmusterung objects, G-type main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for HD 109246 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 109246 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 109246 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 109246 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 109246 in simple terms?

HD 109246, also named Funi, is a G-type main-sequence star in the constellation Draco. It is located 222 light-years from the Sun.

Why does HD 109246 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 109246?

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 109246.