astronomy

HD 1502

HD 1502 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 1502 rather than just read about it. In short: HD 1502 (proper name Citadelle) is an 8th-magnitude K-type subgiant star in the constellation of Pisces, located at a distance of approximately 630 light-years. A super-Jupiter planet, HD 1502 b (proper name Indépendance), is known to orbit the star.

Key takeaways

HD 1502 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 1502 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HD 1502 from memory before moving on to harder problems.

Reference excerpt

HD 1502 (proper name Citadelle) is an 8th-magnitude K-type subgiant star in the constellation of Pisces, located at a distance of approximately 630 light-years. A super-Jupiter planet, HD 1502 b (proper name Indépendance), is known to orbit the star.

Nomenclature In 2019, the Republic of Haiti was assigned to giving the HD 1502 system a proper name as part of the IAU100 NameExoWorlds Project, planned to celebrate the hundredth anniversary of the International Astronomical Union (IAU), which grants the right to name an exoplanetary system to every state and territory in the world. Names were submitted and selected within Haiti, which were then presented to the IAU to be officially recognized. On 17 December 2019, the IAU announced that HD 1502 and its planet, b, were named Citadelle and Indépendance, respectively. Citadelle refers to the Citadelle Laferrière, a fortress located in Milot in northern Haiti, which was built in 1820 and declared a World Heritage Site in 1982 as part of the National History Park. Indépendance was named after the Haitian Declaration of Independence, in celebration of the country's independence on 1 January 1804.

Stellar characteristics The star has evolved past the main sequence stage and is now a subgiant with a mass of 1.46 M☉, a radius of 4.67 R☉, and a spectral type of K0. The star is slightly richer than the Sun in elements heavier than hydrogen and helium, with a metallicity of 0.09±0.03. The star has an effective temperature of 4,947 K (4,674 °C; 8,445 °F), making it cooler than the Sun (5,772 K). Despite this, its large size makes it roughly 12 times brighter. At around 3.0 billion years old, the star is about two-thirds the age of the Sun (4.6 Gyr). Due to its high mass, however, it is further evolved than the Sun, which will spend a total of 10 billion years as a main-sequence star.

Planetary system In 2011, an exoplanet orbiting HD 1502, designated HD 1502 b, was discovered using the radial-velocity method. HD 1502 b revolves around its host star at a distance of 1.262 AU (188.8 million km) with a period of little over one year in a near-circular orbit (i.e., with a low eccentricity), similarly to planets in the Solar System. It is a super-Jupiter planet with a minimum mass of 2.75 MJ and a predicted radius of 1.183 RJ.

See also List of proper names of stars List of proper names of exoplanets List of stars in Pisces List of exoplanets discovered in 2011

References

Footnotes

Further reading Schneider, Jean (1995). "Planet HD 1502 b". The Extrasolar Planet Encyclopaedia. Retrieved 2019-07-17.

HD 1502 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with HD 1502

Start with the simplest possible case. Write down what HD 1502 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 1502 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 1502 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 1502

In research: HD 1502 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 1502 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 1502 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 1502 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 1502 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HD 1502 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 1502 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HD 1502 in simple terms?

Why does HD 1502 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 1502?

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 1502.