astronomy

V4199 Sagittarii

V4199 Sagittarii 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 V4199 Sagittarii rather than just read about it. In short: V4199 Sagittarii is a variable star in the southern constellation of Sagittarius. It is a dim star that is just visible to the naked eye with an apparent visual magnitude that varies between 6.22 and 6.28 over a period of 1.23825 days.

Key takeaways

V4199 Sagittarii belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect V4199 Sagittarii to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of V4199 Sagittarii from memory before moving on to harder problems.

Reference excerpt

V4199 Sagittarii is a variable star in the southern constellation of Sagittarius. It is a dim star that is just visible to the naked eye with an apparent visual magnitude that varies between 6.22 and 6.28 over a period of 1.23825 days. The star is located at a distance of approximately 689 light years from the Sun based on parallax, but is drifting closer with a radial velocity of roughly −23 km/s. It has an absolute magnitude of −0.63, on average. The stellar classification of this star is B5III, matching a B-type giant star. In the Bright Star Catalogue it was listed as a main sequence star of class B5V, although the colors suggest a somewhat more evolved star. The photometric variability of this star was announced by C. Waelkens and F. Rufener in 1985. It is a multi-periodic slowly pulsating B star with a dominant frequency of 0.80780±0.00010 cycles/day. The star has four times the mass of the Sun and three times the Sun's radius. It is radiating ~316 times the luminosity of the Sun from its photosphere at an effective temperature of 14,700 K. A magnetic field has been detected on this star with a strength of −104±32 G. It has a magnitude 9.96 companion star at an angular separation of 90.9″ along a position angle of 310°, as of 2003.

References

Illustrations

Worked examples

Example 1 — a first encounter with V4199 Sagittarii

Start with the simplest possible case. Write down what V4199 Sagittarii 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 V4199 Sagittarii 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 V4199 Sagittarii 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 V4199 Sagittarii

In research: V4199 Sagittarii 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 V4199 Sagittarii 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: V4199 Sagittarii is common in secondary-school and first-year university syllabi. It links to neighbouring topics B-type giants, Bright Star Catalogue objects, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for V4199 Sagittarii 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 V4199 Sagittarii in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what V4199 Sagittarii 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 V4199 Sagittarii out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is V4199 Sagittarii in simple terms?

Why does V4199 Sagittarii 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 V4199 Sagittarii?

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 V4199 Sagittarii.