astronomy

HD 106515

HD 106515 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 106515 rather than just read about it. In short: HD 106515 is a binary star (and currently visual triple system) in the constellation of Virgo. The A and B stars are both K-type main-sequence stars, both somewhat smaller and cooler than the Sun.

Key takeaways

HD 106515 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 106515 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 106515 from memory before moving on to harder problems.

Reference excerpt

HD 106515 is a binary star (and currently visual triple system) in the constellation of Virgo. The A and B stars are both K-type main-sequence stars, both somewhat smaller and cooler than the Sun. The two are gravitationally bound and separated at 310 AU. The binary semimajor axis is 390 AU. The third star in the visual triple, BD−06°3533, is a physically unrelated background star.

Properties HD 106515 AB is a wide binary system which was first observed by Jérôme de Lalande in 1795. The discovery of HD 106515 Ab was announced in a preprint submitted on September 12, 2011. The discovery was made using radial velocity measurements obtained at the CORALIE spectrograph located at La Silla Observatory. Confirmation of the discovery was made by a separate team using the Galileo National Telescope at the Roque de los Muchachos Observatory on the island of La Palma in the Canary Islands, Spain. Initially announced as an exoplanet, astrometric observations in 2021 have found that the true mass is significantly higher than its minimum mass predicted from radial velocity, so it is likely a brown dwarf. A 2022 study found a true mass closer to the minimum mass, but the parameters are less well constrained.

References

Worked examples

Example 1 — a first encounter with HD 106515

Start with the simplest possible case. Write down what HD 106515 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 106515 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 106515 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 106515

In research: HD 106515 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 106515 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 106515 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Binary stars, Durchmusterung objects, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 106515 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 106515 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 106515 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 106515 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 106515 in simple terms?

HD 106515 is a binary star (and currently visual triple system) in the constellation of Virgo. The A and B stars are both K-type main-sequence stars, both somewhat smaller and cooler than the Sun.

Why does HD 106515 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 106515?

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 106515.