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astronomy

Hideo Itokawa

Hideo Itokawa 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 Hideo Itokawa rather than just read about it. In short: Hideo Itokawa (糸川 英夫, Itokawa Hideo; July 20, 1912 – February 21, 1999) was a pioneer of Japanese rocketry, popularly known as "Dr. Rocket," and described in the media as the father of Japan's space development.

Hideo Itokawa — main illustration
Hideo Itokawa — illustration

Key takeaways

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

Reference excerpt

Hideo Itokawa (糸川 英夫, Itokawa Hideo; July 20, 1912 – February 21, 1999) was a pioneer of Japanese rocketry, popularly known as "Dr. Rocket," and described in the media as the father of Japan's space development. The near-Earth asteroid 25143 Itokawa was named in honor of Itokawa, and is notable as the target of the Hayabusa mission.

Biography Born in Tokyo, Itokawa skipped grades in school and graduated from the Tokyo Imperial University (University of Tokyo) in 1935, having majored in aeronautical engineering. In 1941, he became an assistant professor at the university. During World War II, he was involved in designing aircraft at the Nakajima Aircraft Company and designed the Nakajima Ki-43 Hayabusa ("peregrine falcon"; Allied reporting name "Oscar") fighter. Itokawa became a full professor at his alma mater in 1948. In 1955, Itokawa worked on the Pencil Rocket for Japan's space program. He retired from his post at the university in 1967 and established an institute. On 11 February 1970, a team formerly led by him at the Institute of Space and Aeronautical Science at the University of Tokyo succeeded in launching Japan's first satellite, Ohsumi, making the country the fourth nation in the world to have the capability to send objects into orbit with their own launch vehicles. The satellite was carried on a Lambda 4S rocket, a joint project by the Institute of Industrial Science at the university and Nissan. Itokawa wrote 49 books, and was a best-selling author. Topics that Itokawa became interested in or took as a hobby, include such sports as basketball, golf and swimming, as well as orchestral arrangements and such instruments as cello, harmonica, organ, piano, violin and taishōgoto (a string instrument invented in Japan). He was also interested in baton twirling, brain waves, English language plays, Mah Jong, philosophy, rocket engineering and novel writing.

Bibliography Gyakuten no Hasso Hachijussai no Aria Koya wo Yuku

References

Illustrations

Hideo Itokawa illustration

Worked examples

Example 1 — a first encounter with Hideo Itokawa

Start with the simplest possible case. Write down what Hideo Itokawa 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 Hideo Itokawa 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 Hideo Itokawa 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 Hideo Itokawa

In research
Hideo Itokawa 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 Hideo Itokawa 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
Hideo Itokawa is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1912 births, 1999 deaths, Academic staff of the University of Tokyo, so understanding it makes those chapters shorter.
In everyday life
Look for Hideo Itokawa 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 Hideo Itokawa in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Hideo Itokawa means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Hideo Itokawa out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hideo Itokawa in simple terms?

Hideo Itokawa (糸川 英夫, Itokawa Hideo; July 20, 1912 – February 21, 1999) was a pioneer of Japanese rocketry, popularly known as "Dr. Rocket," and described in the media as the father of Japan's space development.

Why does Hideo Itokawa 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 Hideo Itokawa?

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 Hideo Itokawa.

Tags

  • 1912 births
  • 1999 deaths
  • Academic staff of the University of Tokyo
  • Early spaceflight scientists
  • Japanese aerospace engineers
  • Japanese aircraft designers
  • Japanese scientist stubs
  • Rocket scientists
  • Scientists from Tokyo
  • Space program of Japan
  • University of Tokyo alumni

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