astronomy

HIP 12961

HIP 12961 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 HIP 12961 rather than just read about it. In short: HIP 12961 is a star with an exoplanetary companion in the equatorial constellation of Eridanus. It is too faint to be visible to the naked eye, with an apparent visual magnitude of 10.24.

Key takeaways

HIP 12961 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HIP 12961 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HIP 12961 from memory before moving on to harder problems.

Reference excerpt

HIP 12961 is a star with an exoplanetary companion in the equatorial constellation of Eridanus. It is too faint to be visible to the naked eye, with an apparent visual magnitude of 10.24. The distance to this system can be estimated from its parallax measurements, which yield a separation of 76.4 light-years from the Sun. It is receding with a radial velocity of +33 km/s and has a high proper motion, traversing the celestial sphere at an angular rate of 0.300″ yr−1. This was classified as a cool red dwarf star of stellar classification M0 in 1980, while C. B. Stephenson graded it as class K5V in 1986. The absolute magnitude and color index of this star is a closer match to the former. It shows a high chromospheric activity level and is one of the largest and brightest M class red dwarf stars known, with 64% of the mass and 63% of the radius of the Sun. The star is radiating 10% of the luminosity of the Sun from its photosphere at an effective temperature of 4,092 K. HIP 12961 is named Koeia. The name was selected in the NameExoWorlds campaign by Puerto Rico, during the 100th anniversary of the IAU. Koeia was the word for star in the language of the Taíno Indigenous People of the Caribbean.

Planetary system HIP 12961 b is an extrasolar planet that was announced in a press release in October 2009. This planet has at least half the mass of Jupiter and takes over eight weeks to orbit the host star at a separation of 0.25 AU and an eccentricity (ovalness) of 0.17. The planet is named Aumatex. Aumatex was the god of wind in the mythology of the Taíno Indigenous People of the Caribbean. The names were chosen by the Society of Women in Space Exploration- UPR-Humacao Chapter.

References

Worked examples

Example 1 — a first encounter with HIP 12961

Start with the simplest possible case. Write down what HIP 12961 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 HIP 12961 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 HIP 12961 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 HIP 12961

In research: HIP 12961 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 HIP 12961 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: HIP 12961 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Eridanus (constellation), Hipparcos objects, so understanding it makes those chapters shorter.
In everyday life: Look for HIP 12961 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 HIP 12961 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HIP 12961 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 HIP 12961 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HIP 12961 in simple terms?

HIP 12961 is a star with an exoplanetary companion in the equatorial constellation of Eridanus. It is too faint to be visible to the naked eye, with an apparent visual magnitude of 10.24.

Why does HIP 12961 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 HIP 12961?

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 HIP 12961.