astronomy

PROITERES

PROITERES 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 PROITERES rather than just read about it. In short: PROITERES or Project of OIT Electric-Rocket-Engine Onboard Small Space Ship (Japanese: 大阪工業大学電気推進ロケットエンジン搭載小型スペースシッププロジェクト) is a satellite launched by ISRO in 2012 for Osaka Institute of Technology (OIT). This small (15 kg) boxlike system, with solar panels on the hull, is the testbench for the 4.4 W Pulsed Plasma Thruster operating on the microsatellite platform.

Key takeaways

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

Reference excerpt

PROITERES or Project of OIT Electric-Rocket-Engine Onboard Small Space Ship (Japanese: 大阪工業大学電気推進ロケットエンジン搭載小型スペースシッププロジェクト) is a satellite launched by ISRO in 2012 for Osaka Institute of Technology (OIT). This small (15 kg) boxlike system, with solar panels on the hull, is the testbench for the 4.4 W Pulsed Plasma Thruster operating on the microsatellite platform. The total power budget of the satellite is 15 watt.

Project description and goals PROITERES' secondary goals, as stated by the manufacturer, are:

Experiments of two-way radio signal propagation characteristics using amateur radio (430 MHz) band. Communication tests of satellite communication technology using off-the-shelf consumer-grade components. Tracking and communicating by amateur radio users around the world. Monitoring with a high-resolution camera the Yodogawa basin near Osaka and other parts of Kansai District. It is equipped with 3-axis magnetic torquers and gyro-sensors for attitude control (orientation), a magnetic sensor on the boom, a solar sensor, and the Complementary Metal Oxide Semiconductor (CMOS) visible spectrum camera with a five-lens system and a focal length of 85.3 mm and a f number of 3.6.

Failure As of 2013, PROITERES does not respond to any ground commands, although still broadcasting telemetry data. According to the PROITERES development team report on 17 January 2014 at JAXA annual symposium, the PROITERES had a design error resulting in the flight computer engaged in a boot loop. The root cause of the boot loop was the electromagnetic incompatibility issue, resulting in a reset signal being generated if power-up ramp rate of the flight computer is high enough. The Osaka Institute of Technology team abandoned attempts to restore communications with PROITERES satellite and proceeded with development of the PROITERES-2 design.

Worked examples

Example 1 — a first encounter with PROITERES

Start with the simplest possible case. Write down what PROITERES 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 PROITERES 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 PROITERES 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 PROITERES

In research: PROITERES 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 PROITERES 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: PROITERES is common in secondary-school and first-year university syllabi. It links to neighbouring topics Asian spacecraft stubs, Derelict satellites orbiting Earth, Satellites of Japan, so understanding it makes those chapters shorter.
In everyday life: Look for PROITERES 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 PROITERES in 20 minutes

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

Frequently asked questions

What is PROITERES in simple terms?

Why does PROITERES 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 PROITERES?

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 PROITERES.