science

Stephenson 2 DFK 52

Stephenson 2 DFK 52 is a science 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 Stephenson 2 DFK 52 rather than just read about it. In short: Stephenson 2 DFK 52 is a red supergiant star located in the open cluster Stephenson 2 in the constellation Scutum at a distance of about 4,900 light-years from Earth. The star gained attention in 2025 following Atacama Large Millimeter/submillimeter Array (ALMA) observations that revealed a large circumstellar outflow of dust and gas, the largest known circumstellar outflow around any red supergiant star.

Key takeaways

Stephenson 2 DFK 52 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Stephenson 2 DFK 52 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Stephenson 2 DFK 52 from memory before moving on to harder problems.

Reference excerpt

Stephenson 2 DFK 52 is a red supergiant star located in the open cluster Stephenson 2 in the constellation Scutum at a distance of about 4,900 light-years from Earth. The star gained attention in 2025 following Atacama Large Millimeter/submillimeter Array (ALMA) observations that revealed a large circumstellar outflow of dust and gas, the largest known circumstellar outflow around any red supergiant star.

Observation history The open cluster Stephenson 2 was discovered by American astronomer Charles Bruce Stephenson in 1990 in the data obtained by a deep infrared survey. The cluster is also known as RSGC2, one of several massive open clusters in Scutum, each containing multiple red supergiants. The 52nd brightest star in the K band was given an identifier number of 52.

Circumstellar environment ALMA observations in 2023–2024 revealed that Stephenson 2 DFK 52 is surrounded by a large dust and gas outflow extending up to 50,000 AU in radius (or approximately 0.8 light-years). If the star was located at the distance Betelgeuse is from our Solar System, this circumstellar cocoon would appear roughly one-third the angular width of the full moon. This suggests that the star went through a dramatic mass-loss event ~4,000 years ago, resulting in the incredibly large dust envelope. Estimates suggest the total mass loss to the extended circumstellar material at 0.1–1 M☉. The scale and asymmetry of the mass ejection cannot be easily explained by radiation pressure alone, suggesting possible additional mechanisms such as a short-lived superwind phase or multiple star interactions and the star is a progenitor for a Type II-P supernova explosion.

See also Stephenson 2 DFK 1 Stephenson 2 DFK 49

References

Illustrations

Worked examples

Example 1 — a first encounter with Stephenson 2 DFK 52

Start with the simplest possible case. Write down what Stephenson 2 DFK 52 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Stephenson 2 DFK 52 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 Stephenson 2 DFK 52 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 Stephenson 2 DFK 52

In research: Stephenson 2 DFK 52 appears in science 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 Stephenson 2 DFK 52 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: Stephenson 2 DFK 52 is common in secondary-school and first-year university syllabi. It links to neighbouring topics M-type supergiants, Scutum (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for Stephenson 2 DFK 52 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 Stephenson 2 DFK 52 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Stephenson 2 DFK 52 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 Stephenson 2 DFK 52 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Stephenson 2 DFK 52 in simple terms?

Why does Stephenson 2 DFK 52 matter?

Because it connects several science 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 Stephenson 2 DFK 52?

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 Stephenson 2 DFK 52.