astronomy

Raijin-2

Raijin-2 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 Raijin-2 rather than just read about it. In short: Raijin-2 (Rising-2) is a Japanese micro-satellite launched in 2014. The satellite is built around a 10 cm diameter, 1m focal length Cassegrain telescope and features the following instruments: HPT - main telescope with 5m resolution at nadir, operating in visible and near-infrared bands BOL - bolometer array camera for cloud temperature measurement WFC - wide field-of-view CCD camera LSI-N and LSI-W - 2 CMOS medium…

Key takeaways

Raijin-2 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Raijin-2 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Raijin-2 from memory before moving on to harder problems.

Reference excerpt

Raijin-2 (Rising-2) is a Japanese micro-satellite launched in 2014. The satellite is built around a 10 cm diameter, 1m focal length Cassegrain telescope and features the following instruments:

HPT - main telescope with 5m resolution at nadir, operating in visible and near-infrared bands BOL - bolometer array camera for cloud temperature measurement WFC - wide field-of-view CCD camera LSI-N and LSI-W - 2 CMOS medium field-of-view cameras for near-infrared imaging VLF-ANT, R - radio antenna to receive signatures of lighting events All instruments are powered by GaAs solar cells mounted on the spacecraft body, with estimated electrical power of 47.6W. The spacecraft features an unusual central-pillar bus, inherited from the Sprite-Sat satellite. The attitude control is done by means of reaction wheels and magneto-torquers, and qualified for 0.1 degrees angular accuracy.

Launch RISING-2 was launched from Tanegashima, Japan, on 24 May 2014 by a H-IIA rocket.

Mission The satellite is intended for atmosphere research, especially for gathering statistics on cloud formation and the occurrence of sprites in the upper atmosphere. Mission data are down-linked in S-band with maximal data rate of 38.4 kbit/s.

Worked examples

Example 1 — a first encounter with Raijin-2

Start with the simplest possible case. Write down what Raijin-2 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 Raijin-2 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 Raijin-2 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 Raijin-2

In research: Raijin-2 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 Raijin-2 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: Raijin-2 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 H-II rockets, so understanding it makes those chapters shorter.
In everyday life: Look for Raijin-2 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 Raijin-2 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Raijin-2 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 Raijin-2 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Raijin-2 in simple terms?

Raijin-2 (Rising-2) is a Japanese micro-satellite launched in 2014. The satellite is built around a 10 cm diameter, 1m focal length Cassegrain telescope and features the following instruments: HPT - main telescope with 5m resolution at nadir, operating in visible and near-infrared bands BOL - bolom…

Why does Raijin-2 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 Raijin-2?

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 Raijin-2.