astronomy

SUNSAT

SUNSAT 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 SUNSAT rather than just read about it. In short: The Stellenbosch UNiversity SATellite or SUNSAT (COSPAR 1999-008C) was a miniaturized satellite designed and manufactured in South Africa. It was South Africa's first satellite, and was launched aboard a Delta II rocket from the Vandenberg Air Force Base on 23 February 1999.

Key takeaways

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

Reference excerpt

The Stellenbosch UNiversity SATellite or SUNSAT (COSPAR 1999-008C) was a miniaturized satellite designed and manufactured in South Africa. It was South Africa's first satellite, and was launched aboard a Delta II rocket from the Vandenberg Air Force Base on 23 February 1999. Sunsat was built by post-graduate engineering students at the University of Stellenbosch. Its AMSAT designation was SO-35 (Sunsat Oscar 35). Last contact by ground control with SUNSAT was on 19 January 2001, and on 1 February 2001 the end of SUNSAT's functional life in orbit was announced. The satellite operated in orbit for nearly two years. It is predicted to reenter the atmosphere after about 30 years from launch.

Specifications SUNSAT satellite specifications:

Size: 45 x 45 x 60 cm Mass: 64 kg Launcher: Delta II rocket, Mission P-91 Program cost: US $5M (Approximate); the launch was free of charge as SUNSAT was orbited as a secondary payload. The primary payload of the launch was ARGOS, and the Danish Orsted satellite was another secondary payload. Planned lifetime: 4–5 years (NiCad Battery pack life) Main payloads: Amateur radio communications Data interchange Stereo multispectral imager Attitude control: Gravity gradient and magnetorquers, reaction wheels when imaging Accuracy: 3 mrad pitch/roll, 6 mrad yaw 2 Micro Particle Impact Detectors were included as part of experiments conducted in orbit A team (Zaahied Cassim and Rashid Mohamed) from Peninsula Technikon designed and built circuits for both their own piezo film technology and NASA supplied capacitive sensors. SSC 25636

Pushboom imager Ground pixel size: 15 m x 15 m Image width: 51.8 km

References

Worked examples

Example 1 — a first encounter with SUNSAT

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

In research: SUNSAT 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 SUNSAT 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: SUNSAT is common in secondary-school and first-year university syllabi. It links to neighbouring topics Amateur radio satellites, First artificial satellites of a country, South Africa stubs, so understanding it makes those chapters shorter.
In everyday life: Look for SUNSAT 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 SUNSAT in 20 minutes

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

Frequently asked questions

What is SUNSAT in simple terms?

Why does SUNSAT 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 SUNSAT?

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 SUNSAT.