astronomy

List of Mercury-crossing minor planets

List of Mercury-crossing minor planets 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 Mercury-crossing minor planets rather than just read about it. In short: A Mercury crosser or Mercury grazer is an asteroid whose orbit crosses that of Mercury. The Mercury crossers proper have aphelia outside Mercury's (0.4667 AU) and perihelia inside Mercury's (0.3075 AU), whereas those listed here as outer grazers have perihelia within Mercury's aphelion but not within its perihelion.

Key takeaways

List of Mercury-crossing minor planets 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 Mercury-crossing minor planets to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of List of Mercury-crossing minor planets from memory before moving on to harder problems.

Reference excerpt

A Mercury crosser or Mercury grazer is an asteroid whose orbit crosses that of Mercury. The Mercury crossers proper have aphelia outside Mercury's (0.4667 AU) and perihelia inside Mercury's (0.3075 AU), whereas those listed here as outer grazers have perihelia within Mercury's aphelion but not within its perihelion. All have semi-major axes larger than Mercury's, and hence there are no known inner grazers.

List Mercury crossers proper have aphelia outside Mercury's (0.4667 AU) and perihelia inside Mercury's (0.3075 AU). As of 19 August 2026, 525 Mercury crossers were known. (Most values have been rounded to three decimals.)

Mercury grazers All Mercury grazers have semi-major axes larger than Mercury's (0.3871 AU), and hence are outer grazers, i.e. have perihelia within Mercury's aphelion (0.4667 AU) but not within its perihelion (0.3075 AU). As of February 2016, there are 561 Mercury grazers known. (Values have been rounded to three decimals.)

See also List of Venus-crossing minor planets List of Earth-crossing minor planets List of Mars-crossing minor planets List of Jupiter-crossing minor planets List of Saturn-crossing minor planets List of Uranus-crossing minor planets List of Neptune-crossing minor planets

References

External links Very Close Approaches (<0.01 AU) of PHAs to Mercury 1900–2200 Upcoming Close Approaches (<0.10 AU) of Near-Earth Objects to Mercury Planetary Close Encounters for the next 200 years

Worked examples

Example 1 — a first encounter with List of Mercury-crossing minor planets

Start with the simplest possible case. Write down what List of Mercury-crossing minor planets 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 Mercury-crossing minor planets 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 Mercury-crossing minor planets 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 Mercury-crossing minor planets

In research: List of Mercury-crossing minor planets 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 Mercury-crossing minor planets 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 Mercury-crossing minor planets is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lists of minor planets, Mercury-crossing asteroids, Mercury (planet), so understanding it makes those chapters shorter.
In everyday life: Look for List of Mercury-crossing minor planets 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 Mercury-crossing minor planets in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what List of Mercury-crossing minor planets 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 Mercury-crossing minor planets out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is List of Mercury-crossing minor planets in simple terms?

Why does List of Mercury-crossing minor planets 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 Mercury-crossing minor planets?

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 Mercury-crossing minor planets.