astronomy

G 107-69/70

G 107-69/70 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 G 107-69/70 rather than just read about it. In short: G 107-69/70 is a quadruple system, consisting of the astrometric binary G 107-69 and the resolved binary G 107-70. The system is 36.76 light years (11.27 parsecs) from Earth.

Key takeaways

G 107-69/70 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect G 107-69/70 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of G 107-69/70 from memory before moving on to harder problems.

Reference excerpt

G 107-69/70 is a quadruple system, consisting of the astrometric binary G 107-69 and the resolved binary G 107-70. The system is 36.76 light years (11.27 parsecs) from Earth. G 107-69 and G 107-70 are separated by 103.2 arcseconds, or 1163 astronomical units (AU). G 107-69A is a red dwarf star with a spectral type of M4.5 and a mass of about 0.17 M☉. G 107-69B has a mass of about 0.08 M☉ or 84 MJ. The binary has a period of 0.94 years and a predicted separation of about 50 mas. From its mass G 107-69B could be either a low-mass red dwarf star or a brown dwarf. G 107-70 (also called WD 0727+482) is a pair of white dwarfs, with both having similar mass, brightness and atmospheric composition. The binary was first partially resolved in 1976. Later Nelan et al. fully resolved the orbit of this binary with Hubble's Fine Guidance Sensor and found an orbital period of 18.84±0.02 years and a semi-major axis of 663.62±0.79 mas. At a distance of 11.27 parsecs the semi-major axis is about 7.5 AU. By resolving the orbit of the G 107-70 system Nelan et al. were able to calculate the dynamical mass of each component: G 107-70A has a mass of 0.634±0.01 M☉ and G 107-70B has a mass of 0.599±0.01 M☉. Both white dwarfs have a spectral type of DA, which indicates an atmosphere dominated by hydrogen.

See also Gliese 318, suspected to be the closest double white dwarf, which would make G 107-70 the second closest double white dwarf Capella, is another nearby quadruple system

References

Illustrations

Worked examples

Example 1 — a first encounter with G 107-69/70

Start with the simplest possible case. Write down what G 107-69/70 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 G 107-69/70 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 G 107-69/70 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 G 107-69/70

In research: G 107-69/70 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 G 107-69/70 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: G 107-69/70 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Double stars, Gliese and GJ objects, Lynx (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for G 107-69/70 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 G 107-69/70 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what G 107-69/70 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 G 107-69/70 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is G 107-69/70 in simple terms?

G 107-69/70 is a quadruple system, consisting of the astrometric binary G 107-69 and the resolved binary G 107-70. The system is 36.76 light years (11.27 parsecs) from Earth.

Why does G 107-69/70 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 G 107-69/70?

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 G 107-69/70.