astronomy

HD 147513

HD 147513 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 147513 rather than just read about it. In short: HD 147513 (62 G. Scorpii) is a star in the southern constellation of Scorpius.

Key takeaways

HD 147513 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 147513 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 147513 from memory before moving on to harder problems.

Reference excerpt

HD 147513 (62 G. Scorpii) is a star in the southern constellation of Scorpius. It was first catalogued by Italian astronomer Giuseppe Piazzi in his star catalogue as "XVI 55". With an apparent magnitude of 5.38, according to the Bortle scale it is visible to the naked eye from suburban skies. Based upon stellar parallax measurements by the Hipparcos spacecraft, HD 147513 lies some 42 light years from the Sun.

Properties This is a Sun-like main sequence star with a stellar classification of G1V CH-04. It has about 5% greater mass than the Sun, and is considered young with an estimated age of 400 million years. As such, it has a similar luminosity to the Sun despite being more massive. Although the abundance of elements is similar to the Sun, it is a Barium star that is overabundant in elements produced through the s-process. HD 147513 is suspected of being a variable star. HD 147513 is a member of the Ursa Major moving group that share a common proper motion through space. It has a nearby co-moving companion: a DA-class white dwarf located some 5,360 AU distant, where an AU is the average separation of the Earth from the Sun. At one time the pair may have been members of a multiple star system. The progenitor of the white dwarf may have been a closer companion, and while passing through the asymptotic giant branch stage of its evolution, could have transferred matter onto HD 147513 and contaminated this star's photosphere.

Supposed planetary system In 2002, the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star. Based upon the orbital elements, most of this gas giant's orbit lies within the habitable zone (HZ) of the host star; it only passes outside this region at apogee. As such, it is unlikely that a terrestrial planet could have a stable orbit within the HZ unless it moves in a synchronized fashion with the gas giant. Numerical simulations suggest that such a planet could orbit within the L4 or L5 Lagrangian points of the gas giant. The planet, however, has not been independently confirmed by other studies, and in 2025 a paper reported a non-detection, suggesting that the original observations were likely in error.

References

External links "HD 147513". Extrasolar Planets Encyclopaedia. Archived from the original on July 2, 2007.

Illustrations

Worked examples

Example 1 — a first encounter with HD 147513

Start with the simplest possible case. Write down what HD 147513 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 147513 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 147513 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 147513

In research: HD 147513 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 147513 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 147513 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Barium stars, Bright Star Catalogue objects, Durchmusterung objects, so understanding it makes those chapters shorter.
In everyday life: Look for HD 147513 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 147513 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 147513 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 147513 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 147513 in simple terms?

HD 147513 (62 G. Scorpii) is a star in the southern constellation of Scorpius.

Why does HD 147513 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 147513?

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 147513.