astronomy

HD 116852

HD 116852 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 116852 rather than just read about it. In short: HD 116852, also known as HIP 65890, is a solitary, whitish-blue-hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 8.47, making it readily visible in binoculars but not to the naked eye.

Key takeaways

HD 116852 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 116852 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 116852 from memory before moving on to harder problems.

Reference excerpt

HD 116852, also known as HIP 65890, is a solitary, whitish-blue-hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 8.47, making it readily visible in binoculars but not to the naked eye. The star is located relatively far at a distance of 6,310 parsecs but is drifting closer with a heliocentric radial velocity of −47 km/s. At its current distance, HD 116852's brightness is diminished by 0.67 magnitudes due to extinction from interstellar dust. It has an absolute bolometric magnitude of −9.0. HD 116852 has a stellar classification of O8.5 II-III ((f)), indicating that it is an evolved O-type star with a luminosity class intermediate between a bright giant and a regular giant star. The spectrum also includes a strong He II absorption accompanied by weak N III emissions. It has 15 times the mass of the Sun and 19 times the solar radius. It radiates a bolometric luminosity 16,187 times greater than the Sun from its photosphere at an effective temperature of 34,000 K. HD 116852 is metal deficient ([Fe/H] = −0.20) and is estimated to be 5 million years old. Like many hot stars the object spins rapidly, having a projected rotational velocity of 136 km/s. There is a cloud of highly ionized gas in the line-of-sight towards HD 116852. It was first noticed by astronomers Kenneth R. Sembach and Blair D. Savage in 1994. The cloud in question contains an overabundance of carbon including other chemical elements such as silicon, phosphorus, nickel, and germanium. HD 116852 has a high galactic latitude, indicating that it is currently in the galactic halo between the Scutum-Centaurus Arm and the Sagittarius-Carina Arm. It is most likely a runaway star that was ejected from its birthplace into its current location.

References

Worked examples

Example 1 — a first encounter with HD 116852

Start with the simplest possible case. Write down what HD 116852 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 116852 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 116852 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 116852

In research: HD 116852 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 116852 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 116852 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chamaeleon, Durchmusterung objects, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 116852 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 116852 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 116852 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 116852 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 116852 in simple terms?

Why does HD 116852 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 116852?

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 116852.