astronomy

OGLE-2007-BLG-349Lb

OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb rather than just read about it. In short: OGLE-2007-BLG-349Lb is a circumbinary extrasolar planet about 8,000 light-years away in the constellation of Sagittarius. It is the first circumbinary exoplanet to be discovered using the microlensing method of detecting exoplanets.

Key takeaways

OGLE-2007-BLG-349Lb belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect OGLE-2007-BLG-349Lb to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of OGLE-2007-BLG-349Lb from memory before moving on to harder problems.

Reference excerpt

OGLE-2007-BLG-349Lb is a circumbinary extrasolar planet about 8,000 light-years away in the constellation of Sagittarius. It is the first circumbinary exoplanet to be discovered using the microlensing method of detecting exoplanets.

Characteristics

Mass and orbit OGLE-2007-BLG-349Lb is a super-Neptune, an exoplanet that has a mass and radius larger than that of Neptune. It has a mass of around 80 M🜨. This is somewhat close to the mass of Saturn, 95 M🜨, so OGLE-2007-BLG-349Lb can also be considered a gas giant. It orbits at a distance of around 2.9 AU in a circumbinary orbit, meaning it orbits around two stars.

Host star The planet orbits in a circumbinary (M-type) binary star system named OGLE-2007-BLG-349L. They orbit around each other roughly every 9 days. The stars have masses of 0.41 and 0.30 M☉, respectively. The age of the system, radii and temperatures of the stars are not known. In comparison, the Sun is 4.6 billion years old and has a surface temperature of 5778 K. The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14.3. Therefore, it is too dim to be seen with the naked eye.

See also Optical Gravitational Lensing Experiment (OGLE) 47 Ursae Majoris b OGLE-2005-BLG-390Lb OGLE-2006-BLG-109Lb

Notes

References

External links OGLE-2007-BLG-349 AB c at the NASA Exoplanet Archive

Illustrations

Worked examples

Example 1 — a first encounter with OGLE-2007-BLG-349Lb

Start with the simplest possible case. Write down what OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb

In research: OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb 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: OGLE-2007-BLG-349Lb is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanet stubs, Exoplanets detected by microlensing, Exoplanets discovered in 2016, so understanding it makes those chapters shorter.
In everyday life: Look for OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is OGLE-2007-BLG-349Lb in simple terms?

Why does OGLE-2007-BLG-349Lb 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 OGLE-2007-BLG-349Lb?

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 OGLE-2007-BLG-349Lb.