astronomy

List of proper names of exoplanets

List of proper names of exoplanets 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 List of proper names of exoplanets rather than just read about it. In short: Proper names for planets outside of the Solar System – known as exoplanets – are chosen by the International Astronomical Union (IAU) through public naming contests known as NameExoWorlds. Naming The IAU's names for exoplanets – and on most occasions their host stars – are chosen by the Executive Committee Working Group (ECWG) on Public Naming of Planets and Planetary Satellites, a group working parallel with the Wo…

Key takeaways

List of proper names of exoplanets belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect List of proper names of exoplanets to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of List of proper names of exoplanets from memory before moving on to harder problems.

Reference excerpt

Proper names for planets outside of the Solar System – known as exoplanets – are chosen by the International Astronomical Union (IAU) through public naming contests known as NameExoWorlds.

Naming The IAU's names for exoplanets – and on most occasions their host stars – are chosen by the Executive Committee Working Group (ECWG) on Public Naming of Planets and Planetary Satellites, a group working parallel with the Working Group on Star Names (WGSN). Proper names of stars chosen by the ECWG are explicitly recognised by the WGSN. The ECWG's rules for naming exoplanets are identical to those adopted by the Minor Planet Center for minor planets. Names are a single word consisting of sixteen characters or less, pronounceable in some language, non-offensive, and not identical to existing proper names of astronomical objects. Copyrighted names, names of living individuals, and names with political or religious themes are blacklisted by the ECWG. In addition, the discoverer of a planet reserves the right to reject a proposed name for it.

Questionable planets Like the hypothesized Solar System planet Vulcan, which was named but turned out not to exist, the planetary status of a few named exoplanets has been challenged. Two have been refuted:

Dagon, thought to be the first extrasolar planet discovered by visible-light imaging, was found in 2020 to be a debris cloud from a collision of asteroids rather than a planet. Orbitar, detected by radial velocity (RV), was found in 2025 to be due to intrinsic radial velocity variations in its host star. Several others are disputed:

Tondra was detected by radial velocity, so initially only a minimum mass was known. Its true mass is debated; a 2020 study found a mass large enough to be a star, but a 2026 study found a much smaller, planetary mass. Thestias, Spe, and Arkas have been questioned in the literature; they may be due to intrinsic stellar RV variations, but they have not been conclusively disproven. There is some uncertainty about Lipperhey; its orbital period is similar to its star's activity cycle, and a 2025 study found that it cannot be confirmed based on radial velocity alone.

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Illustrations

Worked examples

Example 1 — a first encounter with List of proper names of exoplanets

Start with the simplest possible case. Write down what List of proper names of exoplanets 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 List of proper names of exoplanets 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 List of proper names of exoplanets 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 List of proper names of exoplanets

In research: List of proper names of exoplanets 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 List of proper names of exoplanets 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: List of proper names of exoplanets is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanets with proper names, Lists of exoplanets, so understanding it makes those chapters shorter.
In everyday life: Look for List of proper names of exoplanets 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 List of proper names of exoplanets in 20 minutes

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

Frequently asked questions

What is List of proper names of exoplanets in simple terms?

Proper names for planets outside of the Solar System – known as exoplanets – are chosen by the International Astronomical Union (IAU) through public naming contests known as NameExoWorlds. Naming The IAU's names for exoplanets – and on most occasions their host stars – are chosen by the Executive C…

Why does List of proper names of exoplanets 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 List of proper names of exoplanets?

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 List of proper names of exoplanets.