astronomy

HD 107146

HD 107146 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 107146 rather than just read about it. In short: HD 107146 is a star in the constellation Coma Berenices that is located about 90 light-years (28 pc) from Earth. The apparent magnitude of 7.028 makes this star too faint to be seen with the unaided eye.

Key takeaways

HD 107146 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 107146 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 107146 from memory before moving on to harder problems.

Reference excerpt

HD 107146 is a star in the constellation Coma Berenices that is located about 90 light-years (28 pc) from Earth. The apparent magnitude of 7.028 makes this star too faint to be seen with the unaided eye. The physical properties of this star are similar to the Sun, including the stellar classification G2V, making this a solar analog. The mass of this star is about 109% of the solar mass (M☉) and it has about 99% the radius of the Sun (R☉). It is a young star with an age between 80 and 200 Myr. The axis of rotation is estimated at 21+8−9 degrees to the line of sight and it completes a rotation in a relatively brief 3.5 days.

Circumstellar disc In 2003, astronomers recognized the excess infrared and submillimeter emission indicative of circumstellar dust, the first time such a debris disk phenomenon was noted around a star of similar spectral types to the Sun, though having a much younger age. In 2004 the Hubble Space Telescope detected the presence of a spatially resolved disk surrounding the star. The star's circumstellar disc has dimensions of approximately 210 × 300 AU. The dusty ring is cool, with a temperature of 51 K (−222 °C; −368 °F), and has a dust mass of 0.250±0.004 M🜨 and nearly no gas. Analysis of the debris disk in the far-infrared and submillimeter wavelengths, carried out using the Hubble Space Telescope, suggests the presence of small grains in the disk. The disk appears to be slightly elongated to form an ellipse with its minor axis at a position angle of 58° ± 5°; working under the assumption that the disk is in fact circular gives it an inclination of 25° ± 5° from the plane of the sky. An analysis published in 2009 suggests the possible presence of a planet at a separation of 45-75 AU, in the wide gap centered at 75.4 AU which may be carved by the planet, but no planet with mass exceeding 1-2 MJ was observed in the gap.

Gallery

References

Illustrations

Worked examples

Example 1 — a first encounter with HD 107146

Start with the simplest possible case. Write down what HD 107146 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 107146 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 107146 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 107146

In research: HD 107146 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 107146 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 107146 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Circumstellar disks, Coma Berenices, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 107146 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “HD 107146” →

Affiliate

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

How to study HD 107146 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 107146 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 107146 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 107146 in simple terms?

Why does HD 107146 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 107146?

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 107146.