astronomy

Krüger 60

Krüger 60 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 Krüger 60 rather than just read about it. In short: Krüger 60 (DO Cephei) is a binary star system located 13.1 light-years (4.0 parsecs) from Earth, being one of the nearest stars. It is made up of a pair of red dwarf stars orbiting each other every 45 years.

Key takeaways

Krüger 60 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Krüger 60 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Krüger 60 from memory before moving on to harder problems.

Reference excerpt

Krüger 60 (DO Cephei) is a binary star system located 13.1 light-years (4.0 parsecs) from Earth, being one of the nearest stars. It is made up of a pair of red dwarf stars orbiting each other every 45 years.

Description The larger, primary star is designated component A, while the secondary, smaller star is labeled component B. Component A has about 27% of the Sun's mass and 30% of the Sun's radius. Component B has about 18% of the Sun's mass and 21% of the Sun's radius.

In 1951, Peter van de Kamp and Sarah Lee Lippincott announced that component B is a flare star. It was given the variable star designation "DO Cephei". Flares lasting as long as one hour have been recorded. This system is orbiting through the Milky Way at a distance from the core that varies from 7–9 kpc (23–29kly) with an orbital eccentricity of 0.126–0.130. The closest approach to the Sun will occur in about 88,600 years when this system will come within 1.95 parsecs (6.4 ly). Considering the orbit of the members of Krüger 60, detecting an exoplanet through radial velocity could prove difficult, as its orbit would likely be inclined only 13 degrees from our point of view (like its stars), and create 1/5th as strong a radial velocity signal as an exoplanet orbiting edge-on from the point of view of the Solar System.

Name In 1890 Adalbert Krueger published a part of the AGK catalogue with stars with declination between +55 and +65. He noted which stars appeared to be double. Sherburne Wesley Burnham (1894) observed 67 of these candidate double stars, among which number 60 from his list, which later was called Kruger 60 (star 13170 from the catalogue of Krueger).

Notes

References

Further reading James B. Kaler (22 March 2001). Extreme Stars: At the Edge of Creation. Cambridge University Press. p. 31. ISBN 978-0-521-40262-0.

External links Hires LRGB CCD Image

Worked examples

Example 1 — a first encounter with Krüger 60

Start with the simplest possible case. Write down what Krüger 60 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 Krüger 60 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 Krüger 60 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 Krüger 60

In research: Krüger 60 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 Krüger 60 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: Krüger 60 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Binary stars, Cepheus (constellation), Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for Krüger 60 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 Krüger 60 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Krüger 60 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 Krüger 60 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Krüger 60 in simple terms?

Why does Krüger 60 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 Krüger 60?

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 Krüger 60.