astronomy

HD 152843

HD 152843 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 152843 rather than just read about it. In short: HD 152843 (also designated as TOI-2319) is a single star with a pair of close-orbiting exoplanets, located in the northern constellation of Hercules. It is positioned at a distance of 356 light years from the Sun based on parallax measurements, and at that range is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.85.

Key takeaways

HD 152843 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 152843 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 152843 from memory before moving on to harder problems.

Reference excerpt

HD 152843 (also designated as TOI-2319) is a single star with a pair of close-orbiting exoplanets, located in the northern constellation of Hercules. It is positioned at a distance of 356 light years from the Sun based on parallax measurements, and at that range is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.85. The system is receding further away with a radial velocity of 10 km/s. This is a G-type main-sequence star with a stellar classification of G0. It has 1.15 times the mass and 1.43 times the girth of the Sun. Around four billion years of age, HD 152843 is a quiet star, showing very little magnetic activity in its chromosphere. The abundance of iron, a measure of the star's metallicity, is somewhat lower than in the Sun. It is spinning with a projected rotational velocity of 8.4 km/s.

Planetary system

This star has two confirmed exoplanets orbiting it, being designated HD 152843 b and HD 152843 c. Both were discovered using NASA’s Transiting Exoplanet Survey Satellite (TESS) when they were observed transiting their host star. HD 152843 b is the closest planet to HD 152843, orbiting its host star in just 11.62 days. The planet has 9.8 Earth masses and 3.1 Earth radii. The planet orbits the star at a distance of 0.105 astronomical units (au), has an orbital eccentricity of 0.05, and has an orbital inclination of 89.3°. HD 152843 c is the second planet in the star system and farthest planet from its star. It has 9.7 Earth masses and 5.9 Earth radii. It orbits its host star at a speed of 7.1 kilometers a second, with its orbital eccentricity being 0.07 and an orbital inclination of 89.2°. Its low density of 0.253+0.059−0.057 g⋅cm−3 makes it a super-puff planet.

References

Worked examples

Example 1 — a first encounter with HD 152843

Start with the simplest possible case. Write down what HD 152843 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 152843 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 152843 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 152843

In research: HD 152843 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 152843 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 152843 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, G-type main-sequence stars, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 152843 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 152843 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 152843 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 152843 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 152843 in simple terms?

Why does HD 152843 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 152843?

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 152843.