astronomy

Ross 47

Ross 47 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 Ross 47 rather than just read about it. In short: Ross 47 is a variable star of spectral type M4 located in the constellation Orion. Based on parallax measurements, it lies 18.888 light-years (5.791 parsecs) from Earth.

Key takeaways

Ross 47 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Ross 47 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ross 47 from memory before moving on to harder problems.

Reference excerpt

Ross 47 is a variable star of spectral type M4 located in the constellation Orion. Based on parallax measurements, it lies 18.888 light-years (5.791 parsecs) from Earth.

Ross 47 is a small red dwarf with 23.8% of the Sun's size, and 6% of its luminosity. Its effective temperature is much cooler than the Sun's, about 3,330 K. It is a BY Draconis variable, a star which whose brightness varies across its rotation, having multiple starspots that contribute to the brightness variation. Its apparent magnitude varies from +11.48 to 11.55. Ross 47 was given the variable star designation V1352 Orionis in 1997.

References

Illustrations

Worked examples

Example 1 — a first encounter with Ross 47

Start with the simplest possible case. Write down what Ross 47 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 Ross 47 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 Ross 47 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 Ross 47

In research: Ross 47 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 Ross 47 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: Ross 47 is common in secondary-school and first-year university syllabi. It links to neighbouring topics BY Draconis variables, Gliese and GJ objects, Hipparcos objects, so understanding it makes those chapters shorter.
In everyday life: Look for Ross 47 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 Ross 47 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ross 47 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 Ross 47 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ross 47 in simple terms?

Ross 47 is a variable star of spectral type M4 located in the constellation Orion. Based on parallax measurements, it lies 18.888 light-years (5.791 parsecs) from Earth.

Why does Ross 47 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 Ross 47?

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 Ross 47.