astronomy

Henri Joseph Anastase Perrotin

Henri Joseph Anastase Perrotin 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 Henri Joseph Anastase Perrotin rather than just read about it. In short: Henri Joseph Anastase Perrotin (December 19, 1845 – February 29, 1904) was a French astronomer and a discoverer of minor planets. Some sources give his middle name as Athanase.

Key takeaways

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

Reference excerpt

Henri Joseph Anastase Perrotin (December 19, 1845 – February 29, 1904) was a French astronomer and a discoverer of minor planets. Some sources give his middle name as Athanase. In his early career, he and Guillaume Bigourdan were assistants of Félix Tisserand at Toulouse Observatory. Later, he was the first director of the Nice Observatory in Nice, France from 1884 until his death. He made observations of Mars and attempted to determine the rotation period of Venus. He also calculated perturbations in the orbit of 4 Vesta. In the literature, he is sometimes referred to as Henri Perrotin and sometimes as Joseph Perrotin (this is indeed one and the same person). He is also referenced in H. G. Wells's novel The War of the Worlds as "Perrotin of Nice". His 6 asteroid discoveries are credited by the Minor Planet Center to "J. Perrotin". He won the Prix Lalande in 1875 and 1883. The Martian crater Perrotin and the inner main-belt asteroid 1515 Perrotin were named in his honor.

References

External links Short biography (in French)

H. Perrotin @ Astrophysics Data System

Obituaries AN 165 (1904) 253/254 (in German) Obs 27 (1904) 176 The Observatory, Vol. 27, p. 175-182 (1904)

Illustrations

Worked examples

Example 1 — a first encounter with Henri Joseph Anastase Perrotin

Start with the simplest possible case. Write down what Henri Joseph Anastase Perrotin 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 Henri Joseph Anastase Perrotin 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 Henri Joseph Anastase Perrotin 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 Henri Joseph Anastase Perrotin

In research: Henri Joseph Anastase Perrotin 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 Henri Joseph Anastase Perrotin 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: Henri Joseph Anastase Perrotin is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1845 births, 1904 deaths, 19th-century French astronomers, so understanding it makes those chapters shorter.
In everyday life: Look for Henri Joseph Anastase Perrotin 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 Henri Joseph Anastase Perrotin in 20 minutes

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

Frequently asked questions

What is Henri Joseph Anastase Perrotin in simple terms?

Henri Joseph Anastase Perrotin (December 19, 1845 – February 29, 1904) was a French astronomer and a discoverer of minor planets. Some sources give his middle name as Athanase.

Why does Henri Joseph Anastase Perrotin 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 Henri Joseph Anastase Perrotin?

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 Henri Joseph Anastase Perrotin.