astronomy

HD 106252

HD 106252 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 106252 rather than just read about it. In short: HD 106252 is a star with a brown dwarf companion in the constellation Virgo. An apparent visual magnitude of 7.41 means this star is too faint to be visible to the naked eye.

Key takeaways

HD 106252 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 106252 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 106252 from memory before moving on to harder problems.

Reference excerpt

HD 106252 is a star with a brown dwarf companion in the constellation Virgo. An apparent visual magnitude of 7.41 means this star is too faint to be visible to the naked eye. It is located at a distance of 210 light years from the Sun based on parallax measurements, and is receding with a radial velocity of 15 km/s. The stellar classification of HD 106252 is G0V, matching an ordinary G-type main-sequence star. It has 5% more mass than the Sun and 10% greater in girth. This star is about three billion years old with a low level of magnetic activity and is spinning with a projected rotational velocity of 2 km/s. It is radiating 1.3 times the luminosity of the Sun from its photosphere at an effective temperature of 5,890 K. In 2001, a massive sub-stellar companion was announced orbiting the star by the European Southern Observatory. The discovery was confirmed by a different team using the Lick Telescope. Astrometric observations from Hipparcos in 2011 suggested that its true mass is likely around 30.6 MJ, in the brown dwarf range. More accurate astrometry from Gaia in 2021 revealed a smaller true mass of 10.0 MJ.

References

External links

Worked examples

Example 1 — a first encounter with HD 106252

Start with the simplest possible case. Write down what HD 106252 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 106252 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 106252 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 106252

In research: HD 106252 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 106252 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 106252 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 106252 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 106252 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 106252 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 106252 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 106252 in simple terms?

HD 106252 is a star with a brown dwarf companion in the constellation Virgo. An apparent visual magnitude of 7.41 means this star is too faint to be visible to the naked eye.

Why does HD 106252 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 106252?

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 106252.