astronomy

Gliese 146

Gliese 146 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 146 rather than just read about it. In short: Gliese 146 is a star with an orbiting exoplanet in the constellation Horologium. Gliese 146 is also catalogued as HD 22496, HIP 16711, SAO-216392, and LHS 1563.

Key takeaways

Gliese 146 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 146 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gliese 146 from memory before moving on to harder problems.

Reference excerpt

Gliese 146 is a star with an orbiting exoplanet in the constellation Horologium. Gliese 146 is also catalogued as HD 22496, HIP 16711, SAO-216392, and LHS 1563. With an apparent visual magnitude of 8.64, it is too faint to be visible to the naked eye. Gliese 146 is located at a distance of 44.4 light years based on parallax measurements, and is drifting further away with a heliocentric radial velocity of +21 km/s. This is an ordinary K-type main-sequence star with a stellar classification of K6.5V. It has 68% of the mass of the Sun and 67% of the Sun's girth. Gliese 146 is radiating 12% of the luminosity of the Sun from its photosphere at an effective temperature of 4,385 K. Classified as a suspected variable star, Gliese 146 was found to be a flare star, with average flare frequency 0.23 flares per day. Its velocity relative to the Sun is 38.1 km/second, and its galactic orbit ranges between 20,800 and 25,400 light years from the center of the Galaxy, placing it within a thin disk. It belongs to the Hyades supercluster of stars, and is one of 155 K-type stars within 50 light years.

Planetary system It is one of 500 stars selected in 2009 for the SCUBA-2 All Sky Survey for stars with debris disks. The debris disk was not detected by any survey as in 2015 though. In 2021, a Sub-Neptune planet HD 22496b was discovered utilizing a Doppler spectroscopy method. It is orbiting very close to the host star at a separation of 0.0510 AU (7.63 Gm) and an orbital period of five days. The planet is not known to be transiting. As the inclination of the orbital plane is unknown, only a rough lower bound on the mass of this planet can be established: it has at least ~5.6 times the mass of the Earth.

See also Stars between 13 and 15 parsecs Habitability of K-type main-sequence star systems

References

External links Gliese 146 at the SIMBAD Astronomical Database. Ids – Bibliography – Siblings – Image – B&W Image.

Worked examples

Example 1 — a first encounter with Gliese 146

Start with the simplest possible case. Write down what Gliese 146 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 146 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 146 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 146

In research: Gliese 146 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 146 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 146 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Flare stars, Gliese and GJ objects, so understanding it makes those chapters shorter.
In everyday life: Look for Gliese 146 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 146 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gliese 146 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 146 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gliese 146 in simple terms?

Gliese 146 is a star with an orbiting exoplanet in the constellation Horologium. Gliese 146 is also catalogued as HD 22496, HIP 16711, SAO-216392, and LHS 1563.

Why does Gliese 146 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 146?

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 146.