astronomy

Gliese 69

Gliese 69 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 Gliese 69 rather than just read about it. In short: Gliese 69 is a star located in the constellation of Cassiopeia. It has an apparent magnitude of 8.40.

Key takeaways

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

Reference excerpt

Gliese 69 is a star located in the constellation of Cassiopeia. It has an apparent magnitude of 8.40. Parallax measurements by Gaia put it at a distance of 44.09 light-years (13.6 parsecs) away. Gliese 69 is a K-type main-sequence star that is smaller and less massive than the Sun. It glows with an effective temperature of 4,312 K. It is around 6.9 billion years old, significantly older than the Sun. Gliese 69 is also known by its designations HD 10436 and LHS 1291.

Planetary System In 2019 one candidate planet been detected by the radial velocity method.

References

Worked examples

Example 1 — a first encounter with Gliese 69

Start with the simplest possible case. Write down what Gliese 69 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 Gliese 69 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 Gliese 69 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 Gliese 69

In research: Gliese 69 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 Gliese 69 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: Gliese 69 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cassiopeia (constellation), Durchmusterung objects, Gliese and GJ objects, so understanding it makes those chapters shorter.
In everyday life: Look for Gliese 69 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 Gliese 69 in 20 minutes

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

Frequently asked questions

What is Gliese 69 in simple terms?

Gliese 69 is a star located in the constellation of Cassiopeia. It has an apparent magnitude of 8.40.

Why does Gliese 69 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 Gliese 69?

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 Gliese 69.