astronomy

MOA-2007-BLG-192Lb

MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb rather than just read about it. In short: MOA-2007-BLG-192Lb, occasionally shortened to MOA-192 b, is an extrasolar planet approximately 7,000 light-years away in the constellation of Sagittarius. The planet was discovered orbiting the low-mass star MOA-2007-BLG-192L.

Key takeaways

MOA-2007-BLG-192Lb belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect MOA-2007-BLG-192Lb to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MOA-2007-BLG-192Lb from memory before moving on to harder problems.

Reference excerpt

MOA-2007-BLG-192Lb, occasionally shortened to MOA-192 b, is an extrasolar planet approximately 7,000 light-years away in the constellation of Sagittarius. The planet was discovered orbiting the low-mass star MOA-2007-BLG-192L. It was found when it caused a gravitational microlensing event on May 24, 2007, which was detected as part of the MOA-II microlensing survey at the Mount John University Observatory in New Zealand. The mass of the planet is not well known. It is anything between 2.75 and 105 Earth masses (M🜨), although it is more likely to be between 3 and 12 M🜨. The mass range also means that the planet's classification varies, from a Super-Earth to a Sub-Saturn. It is located at 2.02 astronomical units from its host star.

Host star

MOA-2007-BLG-192L is a red dwarf star, one of the smallest and least massive type of stars, as well as one of the most numerous in the Milky Way. It was initially estimated to have a mass 6% the mass of the Sun, which would probably be too low to sustain nuclear fusion at its core, making it a dimly glowing brown dwarf. However, this mass was based on an erroneous parallax, and a further analysis suggest a higher mass of 0.28 M☉. This would make it a red dwarf. Both MOA-2007-BLG-192L and its planet are located at a distance of 2,160 pc (7,000 ly) from Earth, in the direction of the constellation Sagittarius.

Notes

References

External links "MOA-2007-BLG-192Lb: A Low-Mass Planet with a Possible Sub-Stellar-Mass Host". Archived from the original on 2008-06-06. Retrieved 2008-06-28.

Illustrations

Worked examples

Example 1 — a first encounter with MOA-2007-BLG-192Lb

Start with the simplest possible case. Write down what MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb

In research: MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb 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: MOA-2007-BLG-192Lb is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanets detected by microlensing, Exoplanets discovered in 2008, Sagittarius (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MOA-2007-BLG-192Lb in simple terms?

Why does MOA-2007-BLG-192Lb 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 MOA-2007-BLG-192Lb?

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 MOA-2007-BLG-192Lb.