astronomy

Hodoyoshi 3

Hodoyoshi 3 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 Hodoyoshi 3 rather than just read about it. In short: Hodoyoshi-3 is a Japanese micro-satellite launched in 2014. The satellite is built in 0.5x0.5x0.65m box-shape bus, optimized for piggy-back launch.

Key takeaways

Hodoyoshi 3 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hodoyoshi 3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hodoyoshi 3 from memory before moving on to harder problems.

Reference excerpt

Hodoyoshi-3 is a Japanese micro-satellite launched in 2014. The satellite is built in 0.5x0.5x0.65m box-shape bus, optimized for piggy-back launch. All instruments are powered by solar cells mounted on the spacecraft body and two stub wings, with estimated electrical power of 50W. For orbit-keeping, a hydrogen peroxide thruster is used. The satellite was developed under the Funding Program for World-Leading Innovation R&D on Science and Technology.

Launch Hodoyoshi-3 was launched from Dombarovsky (air base) site 13, Russia, on 19 June 2014 by a Dnepr rocket. Two-side communication with Earth was successfully achieved at 2nd pass over ground station.

Mission The satellite is intended primarily for technology verification in space, main test piece being 2 Earth observation cameras with nominal 40 m GSD (Middle resolution camera: MCAM) and 200 m GSD (Low resolution camera: LCAM). MCAM is performing the spectroscopic observation of near-infrared rays, red, and three green bands by adopting a multi-band pass filter as a spectrum filter. Normalized Difference Vegetation Index(NDVI) drawn using near-infrared rays and a red band, It is well used to evaluation of the degrees of growth, such as agricultural products and trees, and soundness, and broad-based mapping of a vegetation index is attained by using the spectrum picture which MCAM acquires. Secondary mission is measurements of water level in rivers to monitor floods by using Store&Forward System. Third mission is Hosted Payload. Hosted Payload mission consisted of 10 cm-cubic boxes on which users could install their own apparatuses for their own applications. Project members asked users in private partnership such as Sanrio corporation in order to explore new market of satellite utilization.

Private Partnership The satellite also included private/public partnership in the form of Hello Kitty, a popular character of the Sanrio corporation, on the satellite Hosted Payload box. Hello Kitty looks out a window of the craft to a view of Earth. Electronic message display was installed which operators could change characters on the display by sending commands from the ground station. Users can take photos of their messages with Hello Kitty figure and the view of the earth from the window. The inclusion is an attempt to get more private Japanese companies working with satellites and it is hoped will boost enthusiasm for space among Hello Kitty's many fans.

See also 2014 in spaceflight Hodoyoshi 4

References

External links Hodoyoshi 3-4 Satellite on Facebook Nano-Satellite Center, University of Tokyo Hodoyoshi and UNIFORM satellites tracking

Illustrations

Worked examples

Example 1 — a first encounter with Hodoyoshi 3

Start with the simplest possible case. Write down what Hodoyoshi 3 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 Hodoyoshi 3 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 Hodoyoshi 3 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 Hodoyoshi 3

In research: Hodoyoshi 3 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 Hodoyoshi 3 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: Hodoyoshi 3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Earth observation satellites of Japan, Secondary payloads, Spacecraft launched by Dnepr rockets, so understanding it makes those chapters shorter.
In everyday life: Look for Hodoyoshi 3 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 Hodoyoshi 3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hodoyoshi 3 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 Hodoyoshi 3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hodoyoshi 3 in simple terms?

Hodoyoshi-3 is a Japanese micro-satellite launched in 2014. The satellite is built in 0.5x0.5x0.65m box-shape bus, optimized for piggy-back launch.

Why does Hodoyoshi 3 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 Hodoyoshi 3?

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 Hodoyoshi 3.