astronomy

Gliese 54

Gliese 54 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 54 rather than just read about it. In short: Gliese 54, also known as HIP 5496 and LHS 1208, is a nearby star system. It is 25.7 light-years away, in the constellation of Tucana, close to the edge, almost in the neighboring Hydrus.

Key takeaways

Gliese 54 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 54 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gliese 54 from memory before moving on to harder problems.

Reference excerpt

Gliese 54, also known as HIP 5496 and LHS 1208, is a nearby star system. It is 25.7 light-years away, in the constellation of Tucana, close to the edge, almost in the neighboring Hydrus. It is below the threshold of brightness to be observable to the naked eye with an apparent magnitude of +9.80. The two stars of this system have an orbital period a little over a year, and are smaller than the Sun. The main component is a red dwarf of spectral type M2 with an effective temperature of 4,250 K, a mass 43% that of the Sun and a radius 51% that of the Sun. The companion, a red dwarf which brightness is about one magnitude lower than the primary, has been resolved with the instrument NICMOS installed in the Hubble Space Telescope. It is 30% as massive as the Sun. In the SIMBAD database it appears listed as a variable star, getting the provisional designation NSV 427 from the New Catalogue of Suspected Variable Stars. The closest stars to Gliese 54 are Zeta Tucanae, a solar analog at 3.1 light-years, and Beta Hydri, at 5.1 light-years.

See also List of nearest stars and brown dwarfs

References

Worked examples

Example 1 — a first encounter with Gliese 54

Start with the simplest possible case. Write down what Gliese 54 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 54 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 54 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 54

In research: Gliese 54 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 54 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 54 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Binary stars, Durchmusterung objects, Gliese and GJ objects, so understanding it makes those chapters shorter.
In everyday life: Look for Gliese 54 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 54 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gliese 54 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 54 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gliese 54 in simple terms?

Gliese 54, also known as HIP 5496 and LHS 1208, is a nearby star system. It is 25.7 light-years away, in the constellation of Tucana, close to the edge, almost in the neighboring Hydrus.

Why does Gliese 54 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 54?

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 54.