astronomy

HD 87883

HD 87883 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 87883 rather than just read about it. In short: HD 87883 is star in the northern constellation of Leo Minor. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.56.

Key takeaways

HD 87883 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 87883 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 87883 from memory before moving on to harder problems.

Reference excerpt

HD 87883 is star in the northern constellation of Leo Minor. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.56. The star is located at a distance of 59.7 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +9.3 km/s. It has an absolute magnitude of 6.27. This is an ordinary K-type main-sequence star with a stellar classification of K0V. It has a modest level of chromospheric activity, and is rotating with a period of 38.6 days. The star is smaller than the Sun, with 82% of the mass of the Sun and 76% of the Sun's radius. The age of this star is 9.8 billion years, compared with 4.6 billion years for the Sun. It is radiating 32% of the luminosity of the Sun from its photosphere at an effective temperature of 4,980 K. In August 2009, this star was found to have a planet via the radial velocity method. The orbital solution shows it to be a Super-Jupiter body in an elliptical orbit with a period of 7.54 yr and a typical separation of 3.6 AU. A relatively high deviation on the model fit suggests there may be an additional planetary companion in a close, perturbing orbit of the star. The orbital parameters of the known planet do not preclude the existence of an Earth-mass planet with a dynamically-stable orbit in the habitable zone. Since its orbit is relatively face-on, its true mass deviates significantly from its minimum mass, at 6.31+0.31−0.32 MJ.

Worked examples

Example 1 — a first encounter with HD 87883

Start with the simplest possible case. Write down what HD 87883 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 87883 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 87883 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 87883

In research: HD 87883 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 87883 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 87883 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Henry Draper Catalogue objects, Hipparcos objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 87883 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study HD 87883 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 87883 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 87883 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 87883 in simple terms?

HD 87883 is star in the northern constellation of Leo Minor. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.56.

Why does HD 87883 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 87883?

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 87883.