science

Pioneer 2

Pioneer 2 is a science 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 Pioneer 2 rather than just read about it. In short: Pioneer 2 (also known as Able 3) was the last of the three project Able space probes designed to probe lunar and cislunar space. Spacecraft design Pioneer 2 (NSSDCA ID: PION2) was nearly identical to Pioneer 1.

Key takeaways

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

Reference excerpt

Pioneer 2 (also known as Able 3) was the last of the three project Able space probes designed to probe lunar and cislunar space.

Spacecraft design Pioneer 2 (NSSDCA ID: PION2) was nearly identical to Pioneer 1. It consisted of a thin cylindrical midsection with a squat truncated cone frustum on each side. The cylinder was 74 centimeters (29 in) in diameter and the height from the top of one cone to the top of the opposite cone was 76 centimeters (30 in). Along the axis of the spacecraft and protruding from the end of the lower cone was a 11-kilogram (24 lb) solid propellant injection rocket and rocket case, which formed the main structural member of the spacecraft. Eight small low-thrust solid propellant velocity adjustment rockets were mounted on the end of the upper cone in a ring assembly which could be jettisoned after use. A magnetic dipole antenna also protruded from the top of the upper cone. The shell was composed of laminated plastic. The total mass of the spacecraft after vernier separation but before injection rocket firing was 39.5 kilograms (87 lb).

The scientific instrument package had a mass of 15.6 kg (34.4 lb) and consisted of an STL image-scanning television system (which replaced the NOTS (Naval Ordnance Test Station) image scanning infrared television system on Pioneer 1), a proportional counter for radiation measurements, an ionization chamber to measure radiation in space, a diaphragm/microphone assembly to detect micrometeorites, a spin-coil magnetometer to measure magnetic fields to 5 microgauss, and temperature-variable resistors to record spacecraft internal conditions.

The spacecraft was powered by nickel-cadmium batteries for ignition of the rockets, silver cell batteries for the television system, and mercury batteries for the remaining circuits. The radio transmission was at 108.06 MHz through a magnetic dipole antenna for the television system, telemetry, and doppler. Ground commands were received at 115 MHz. The spacecraft was to be spin-stabilized at 1.8 revolutions per second, the spin direction approximately perpendicular to the geomagnetic meridian planes of the trajectory.

Flight

The launch took place at 07:30:21 GMT on 8 November 1958. After Pioneer 1 had failed due to guidance system deficiencies, the guidance system was modified with a Doppler command system to ensure more accurate commands and minimize trajectory errors. Once again, the first and second stage portion of the flight was uneventful, but the third stage of the launch vehicle failed to ignite, making it impossible for Pioneer 2 to achieve orbital velocity. An attempt to fire the vernier engines on the probe was unsuccessful and the spacecraft attained a maximum altitude of 1,550 km (960 mi) before reentering Earth's atmosphere at 28.7° N, 1.9° E over NW Africa. A small amount of data was obtained during the short flight, including evidence that the equatorial region around Earth has higher flux and higher energy radiation than previously considered and that the micrometeorite density is higher around Earth than in space. The reason for the third stage failure was unclear, but it was suspected that the firing command from the second stage, which contained the guidance package for the entire launch vehicle, was never received, possibly due to damage to electrical lines during staging.

References

External links

United States Space Program Progress 1958 discusses Pioneer 0 - 3 at YouTube Space Technology Laboratories Documents Archive NSSDC Master Catalog: Spacecraft Pioneer 2

Illustrations

Worked examples

Example 1 — a first encounter with Pioneer 2

Start with the simplest possible case. Write down what Pioneer 2 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Pioneer 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 Pioneer 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 Pioneer 2

In research: Pioneer 2 appears in science 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 Pioneer 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: Pioneer 2 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Missions to the Moon, Pioneer program, Space missions that ended in failure, so understanding it makes those chapters shorter.
In everyday life: Look for Pioneer 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 Pioneer 2 in 20 minutes

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

Frequently asked questions

What is Pioneer 2 in simple terms?

Pioneer 2 (also known as Able 3) was the last of the three project Able space probes designed to probe lunar and cislunar space. Spacecraft design Pioneer 2 (NSSDCA ID: PION2) was nearly identical to Pioneer 1.

Why does Pioneer 2 matter?

Because it connects several science 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 Pioneer 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 Pioneer 2.