astronomy

HD 10647

HD 10647 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 10647 rather than just read about it. In short: HD 10647 (q1 Eridani) is a 6th-magnitude yellow-white dwarf star, 57 light-years away in the constellation of Eridanus. The star is visible to the unaided eye under very dark skies.

Key takeaways

HD 10647 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 10647 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 10647 from memory before moving on to harder problems.

Reference excerpt

HD 10647 (q1 Eridani) is a 6th-magnitude yellow-white dwarf star, 57 light-years away in the constellation of Eridanus. The star is visible to the unaided eye under very dark skies. It is slightly hotter and more luminous than the Sun, and at 700 million years old, it is also younger. An extrasolar planet was discovered orbiting this star in 2003. There is a companion star lying at an angular separation of 35.8'. It is a red dwarf with a spectral type of M4.0Ve.

Planetary system

In 2003, Michel Mayor's team announced the discovery of a new planet, HD 10647 b, in Paris at the XIX IAP Colloquium Extrasolar Planets: Today & Tomorrow. The Anglo-Australian Planet Search team initially did not detect the planet in 2004, though a solution was made by 2006. The CORALIE data was finally published in 2013. The IRAS infrared space telescope detected an excess of infrared radiation from the star, indicating a possible circumstellar disk. Out of the 300 nearest Sun-like stars, the disk has the highest fractional luminosity out of all of them. It is unusually bright, but not unusually massive; the lower bound of the mass is 8 times that of the Earth. The inclination of the disk is relatively high, and the disk is asymmetrical, being more extended in the northeast direction than the southwest. It extends from 34 astronomical units (AU) at the inner edge to 134 AU at the outer edge. The inner edge is sharp, suggesting the existence of a planet that carved out the edge. HD 10647 b, with a semimajor axis of about 2 AU, is too far to be responsible. However, other potential planets may be responsible for this feature. If HD 10647 b shares the same orbital inclination as the disk (76.7°±1.0°), its mass should be about 1.07 Jupiter masses, close to its minimum mass of 0.90 Jupiter masses. There is some evidence for an additional, warm asteroid belt-like component further in, at 3 to 10 AU away from the star.

Notes

References

External links "A Jovian planet around HD 10647". Geneva Observatory. "HD 10647 / HR 506 / CP(D)-54 365 (q1 Eridani)". SolStation. Archived from the original on August 5, 2003. Retrieved 2008-06-12. Sky Map: HD 10647

Illustrations

Worked examples

Example 1 — a first encounter with HD 10647

Start with the simplest possible case. Write down what HD 10647 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 10647 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 10647 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 10647

In research: HD 10647 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 10647 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 10647 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bayer objects, Bright Star Catalogue objects, Circumstellar disks, so understanding it makes those chapters shorter.
In everyday life: Look for HD 10647 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 10647” →

Affiliate

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

How to study HD 10647 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 10647 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 10647 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 10647 in simple terms?

HD 10647 (q1 Eridani) is a 6th-magnitude yellow-white dwarf star, 57 light-years away in the constellation of Eridanus. The star is visible to the unaided eye under very dark skies.

Why does HD 10647 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 10647?

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 10647.