astronomy

HD 130322

HD 130322 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 HD 130322 rather than just read about it. In short: HD 130322 is a star with a close orbiting exoplanet in the constellation of Virgo. The distance to this system is 104 light-years, as determined using parallax measurements.

Key takeaways

HD 130322 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HD 130322 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 130322 from memory before moving on to harder problems.

Reference excerpt

HD 130322 is a star with a close orbiting exoplanet in the constellation of Virgo. The distance to this system is 104 light-years, as determined using parallax measurements. It is drifting closer to the Sun with a radial velocity of −12.4 km/s. With an apparent visual magnitude of 8.04, it is too dim to be visible to the naked eye; requiring binoculars or a small telescope to view. Being almost exactly on the celestial equator the star is visible everywhere in the world except for the North Pole. The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.197 arcsec yr−1. The spectrum of this star presents as a K-type main-sequence star, an orange dwarf, with a stellar classification of K0V. The star has 92% of the mass of the Sun and 85% of the Sun's radius. It is spinning with a rotation period of 26.5 days. HD 130322 is radiating 62% of the luminosity of the Sun from its photosphere at an effective temperature of 5,387 K. It is estimated to be around six billion years old. The star HD 130322 is named Mönch and its companion is Eiger. The names were selected in the NameExoWorlds campaign by Switzerland, during the 100th anniversary of the IAU. Mönch and Eiger are prominent peaks of the Bernese Alps.

Planetary system In 2000, an extrasolar planet was discovered orbiting the star using Doppler spectroscopy. As the inclination of the orbital plane is unknown, only a lower bound on the mass can be estimated. Most likely this is a hot Jupiter as it is orbiting close to the host star and has at least the mass of Jupiter. The star rotates at an inclination of 76+14−42 degrees relative to Earth. It has been assumed that the planet shares that inclination. But several "hot Jupiters" are known to be oblique relative to the stellar axis.

See also Lists of exoplanets Hot Jupiter Exoplanet

References

Worked examples

Example 1 — a first encounter with HD 130322

Start with the simplest possible case. Write down what HD 130322 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 HD 130322 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 HD 130322 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 HD 130322

In research: HD 130322 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 HD 130322 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: HD 130322 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Henry Draper Catalogue objects, Hipparcos objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 130322 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 HD 130322 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 130322 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 HD 130322 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 130322 in simple terms?

HD 130322 is a star with a close orbiting exoplanet in the constellation of Virgo. The distance to this system is 104 light-years, as determined using parallax measurements.

Why does HD 130322 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 HD 130322?

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 HD 130322.