astronomy

OGLE-TR-111

OGLE-TR-111 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-TR-111 rather than just read about it. In short: OGLE-TR-111 is a yellow dwarf star approximately 3,600 light-years away in the constellation of Carina (the Keel) with an apparent magnitude of about 17. Because its apparent brightness changes when one of its planets transits, the star has been given the variable star designation V759 Carinae.

Key takeaways

OGLE-TR-111 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-TR-111 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of OGLE-TR-111 from memory before moving on to harder problems.

Reference excerpt

OGLE-TR-111 is a yellow dwarf star approximately 3,600 light-years away in the constellation of Carina (the Keel) with an apparent magnitude of about 17. Because its apparent brightness changes when one of its planets transits, the star has been given the variable star designation V759 Carinae.

Planetary system In 2002 the Optical Gravitational Lensing Experiment (OGLE) survey detected that the light from the star periodically dimmed very slightly every 4 days, indicating a planet-sized body transiting the star. But since the mass of the object had not been measured, it was not clear that it was a true planet, low-mass red dwarf or something else. In 2004 radial velocity measurements showed unambiguously that the transiting body is indeed a planet. The planet is probably very similar to the other "hot Jupiters" orbiting nearby stars. Its mass is about half that of Jupiter and it orbits the star at a distance less than 1/20th that of Earth from the Sun.

Unconfirmed planet candidate In 2005, evidence of another transit was announced. Planet "OGLE-TR-111c" is a possible extrasolar planet orbiting the star. It was first proposed in 2005 based on preliminary evidence from the Optical Gravitational Lensing Experiment (OGLE) survey. More data is required to confirm this planet candidate. If it is confirmed, OGLE-TR-111 would become one of the first stars with a pair of transiting planets.

See also OGLE-2005-BLG-390L List of extrasolar planets

References

External links "OGLE-TR-111". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-04-29.

Illustrations

Worked examples

Example 1 — a first encounter with OGLE-TR-111

Start with the simplest possible case. Write down what OGLE-TR-111 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-TR-111 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-TR-111 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-TR-111

In research: OGLE-TR-111 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-TR-111 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-TR-111 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Carina (constellation), K-type main-sequence stars, Objects with variable star designations, so understanding it makes those chapters shorter.
In everyday life: Look for OGLE-TR-111 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-TR-111 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what OGLE-TR-111 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-TR-111 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is OGLE-TR-111 in simple terms?

Why does OGLE-TR-111 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-TR-111?

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-TR-111.