astronomy

HD 86264

HD 86264 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 86264 rather than just read about it. In short: HD 86264 is a single star with an exoplanetary companion in the equatorial constellation of Hydra. It is too faint to be readily visible to the naked eye with an apparent visual magnitude of 7.41.

Key takeaways

HD 86264 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 86264 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 86264 from memory before moving on to harder problems.

Reference excerpt

HD 86264 is a single star with an exoplanetary companion in the equatorial constellation of Hydra. It is too faint to be readily visible to the naked eye with an apparent visual magnitude of 7.41. The distance to this star, as determined by parallax measurements, is 219 light-years, and it is drifting further away with a radial velocity of +7.4 km/s. A 2015 survey ruled out the existence of any stellar companions at projected distances above 30 astronomical units. This is an F-type main-sequence star with a stellar classification of F7V. It is about two billion years old with a modest level of chromospheric activity and is spinning with a projected rotational velocity of 13 km/s. The star is larger and more massive compared to the Sun, and it has a higher metallicity—the abundance of elements with a higher atomic number than helium. It is radiating four times the luminosity of the Sun from its photosphere at an effective temperature of 6,616 K.

Planetary system In August 2009, it was announced that an exoplanet was found in an eccentric orbit around this host star. The extended habitable zone for this star ranges from 1.50 AU out to 5.06 AU. The planet orbits between 0.86 AU and 4.86 AU, crossing nearly all of the habitable zone. An estimate of the planet's inclination and true mass via astrometry, though with high error, was published in 2022.

Worked examples

Example 1 — a first encounter with HD 86264

Start with the simplest possible case. Write down what HD 86264 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 86264 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 86264 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 86264

In research: HD 86264 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 86264 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 86264 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, F-type main-sequence stars, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 86264 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 86264 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 86264 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 86264 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 86264 in simple terms?

HD 86264 is a single star with an exoplanetary companion in the equatorial constellation of Hydra. It is too faint to be readily visible to the naked eye with an apparent visual magnitude of 7.41.

Why does HD 86264 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 86264?

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 86264.