astronomy

HD 93963

HD 93963 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 93963 rather than just read about it. In short: HD 93963 is a binary star in the constellation Leo Minor. At an apparent magnitude of +9.18, it is not visible to the naked eye.

Key takeaways

HD 93963 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 93963 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 93963 from memory before moving on to harder problems.

Reference excerpt

HD 93963 is a binary star in the constellation Leo Minor. At an apparent magnitude of +9.18, it is not visible to the naked eye. Parallax measurements give a distance of 268 light-years (82.3 parsecs) and 273 light-years (83.8 parsecs) for the primary and secondary component, respectively. Interstellar extinction causes the system's magnitude to be reduced by 0.10±0.05 magnitudes.

Characteristics The primary, HD 93963 A, is main sequence star of class G0V. The star has a mass 1.11 times that of the Sun and a radius 1.043 times solar. It irradiates 25% more luminosity than the Sun and has an effective temperature of 5,987 K, giving it a yellowish-white hue as typical of G-type stars. The companion, HD 93963 B, is a red dwarf star of class M5V. The star has 0.16 times the mass and 0.20 times the radius of the Sun, with a cool effective temperature of 3,060 K. It has a projected separation of 484 au from the primary.

Planetary system Two planets have been discovered around the primary star in 2022 with the joint use of transit photometry and radial velocity.

HD 93963 A b is a super-Earth with an orbital period of 1.04 days. It orbits at a semi-major axis of 0.0209 AU and shows an inclination of 86.21 degrees. The planet has a radius of 1.35±0.042 Earth radii. Its mass estimate sits at 7.8±3.2 Earth masses. HD 93963 A c is a sub-Neptune planet that completes an orbit every 3.65 days. Its radius measures 3.228±0.059 Earth radii and its mass measures 19.2±4.1 Earth masses.

References

Worked examples

Example 1 — a first encounter with HD 93963

Start with the simplest possible case. Write down what HD 93963 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 93963 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 93963 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 93963

In research: HD 93963 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 93963 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 93963 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Henry Draper Catalogue objects, Leo Minor, Planetary systems, so understanding it makes those chapters shorter.
In everyday life: Look for HD 93963 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 93963 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 93963 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 93963 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 93963 in simple terms?

HD 93963 is a binary star in the constellation Leo Minor. At an apparent magnitude of +9.18, it is not visible to the naked eye.

Why does HD 93963 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 93963?

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 93963.