astronomy

HD 99109 b

HD 99109 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 99109 b rather than just read about it. In short: HD 99109 b, formally named Perwana, is an extrasolar planet approximately 197 light-years away in the constellation of Leo. The planet was confirmed in 2006 to be orbiting the orange dwarf star HD 99109.

Key takeaways

HD 99109 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 99109 b to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 99109 b from memory before moving on to harder problems.

Reference excerpt

HD 99109 b, formally named Perwana, is an extrasolar planet approximately 197 light-years away in the constellation of Leo. The planet was confirmed in 2006 to be orbiting the orange dwarf star HD 99109. The planet is about one half the mass of Jupiter, classifying the planet as a Jovian planet. The orbital eccentricity is about the same as Mars. The planet HD 99109 b is named Perwana. The name was selected in the NameExoWorlds campaign by Pakistan, during the 100th anniversary of the IAU. Perwana (پروانہ) means moth in Urdu, alluding to the eternal love of an object circling a source of light (name of HD 99109 is Shama or lamp). A survey of the stability of hypothetical trojan planets of gas giants showed that Perwana might be capable of hosting habitable Earth-sized planets as trojans.

References

External links "HD 99109". Exoplanets. Archived from the original on 2009-11-25. Retrieved 2008-07-18. "HD 99109 b". PlanetQuest. Archived from the original on 2008-09-17. Retrieved 2008-07-18.

Worked examples

Example 1 — a first encounter with HD 99109 b

Start with the simplest possible case. Write down what HD 99109 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 99109 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 99109 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 99109 b

In research: HD 99109 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 99109 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 99109 b is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanet stubs, Exoplanets detected by radial velocity, Exoplanets discovered in 2005, so understanding it makes those chapters shorter.
In everyday life: Look for HD 99109 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 99109 b in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 99109 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 99109 b out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 99109 b in simple terms?

Why does HD 99109 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 99109 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 99109 b.