astronomy

Sanduleak −69 202

Sanduleak −69 202 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 Sanduleak −69 202 rather than just read about it. In short: Sanduleak -69 202 (Sk -69 202, also known as GSC 09162-00821) was a magnitude 12 blue supergiant star, located on the outskirts of the Tarantula Nebula in the Large Magellanic Cloud. It was the progenitor of supernova 1987A.

Key takeaways

Sanduleak −69 202 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sanduleak −69 202 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sanduleak −69 202 from memory before moving on to harder problems.

Reference excerpt

Sanduleak -69 202 (Sk -69 202, also known as GSC 09162-00821) was a magnitude 12 blue supergiant star, located on the outskirts of the Tarantula Nebula in the Large Magellanic Cloud. It was the progenitor of supernova 1987A. The star was originally charted by the Romanian-American astronomer Nicholas Sanduleak in 1970, but was not well studied until identified as the star that exploded in the first naked eye supernova since the invention of the telescope, when its maximum reached visual magnitude +2.8. The discovery that a blue supergiant was a supernova progenitor contradicted the prevailing theories of stellar evolution and produced a flurry of new ideas about how such a thing might happen, but it is now accepted that blue supergiants are a normal progenitor for some supernovae. Sher 25, HD 168625 and SBW1 possess bipolar nebulae that are very similar to that around Sk -69 202. It is speculated that Sk -69 202 may have been a luminous blue variable in the recent past, although it was apparently a normal luminous supergiant at the time it exploded.

See also Neutrino astronomy List of supernovae History of supernova observation

References

Illustrations

Worked examples

Example 1 — a first encounter with Sanduleak −69 202

Start with the simplest possible case. Write down what Sanduleak −69 202 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 Sanduleak −69 202 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 Sanduleak −69 202 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 Sanduleak −69 202

In research: Sanduleak −69 202 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 Sanduleak −69 202 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: Sanduleak −69 202 is common in secondary-school and first-year university syllabi. It links to neighbouring topics B-type supergiants, Dorado, Luminous blue variables, so understanding it makes those chapters shorter.
In everyday life: Look for Sanduleak −69 202 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Sanduleak −69 202” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Sanduleak −69 202 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sanduleak −69 202 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 Sanduleak −69 202 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sanduleak −69 202 in simple terms?

Why does Sanduleak −69 202 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 Sanduleak −69 202?

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 Sanduleak −69 202.