astronomy

OGLE-2006-BLG-109L

OGLE-2006-BLG-109L 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-2006-BLG-109L rather than just read about it. In short: OGLE-2006-BLG-109L (where the last 'L' stands for lens) is a dim magnitude 17 M0V galactic bulge star approximately 4,920 light-years away in the constellation of Scorpius. Planetary system In 2008, two extrasolar planets were discovered around the star using gravitational microlensing.

Key takeaways

OGLE-2006-BLG-109L 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-2006-BLG-109L to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of OGLE-2006-BLG-109L from memory before moving on to harder problems.

Reference excerpt

OGLE-2006-BLG-109L (where the last 'L' stands for lens) is a dim magnitude 17 M0V galactic bulge star approximately 4,920 light-years away in the constellation of Scorpius.

Planetary system In 2008, two extrasolar planets were discovered around the star using gravitational microlensing. The two planets are at a distance from their star that make them suspected analogs of Jupiter and Saturn. The star is surrounded by a planetary system consisting of at least two planets: b with a mass of 0.727 of Jupiter and c with the mass of approximately 0.271 of Jupiter. Their mass ratios, distance ratios, and equilibrium temperatures are similar to those of Jupiter and Saturn in the Solar System as well as the 47 UMa system. Both planets were discovered simultaneously by gravitational microlensing in a common effort by the Optical Gravitational Lensing Experiment, microFUN, MOA, PLANET and RoboNet collaborations, as announced on 14 February 2008. This is the first planetary system where more than one planet was detected using gravitational microlensing.

See also Optical Gravitational Lensing Experiment or OGLE OGLE-2005-BLG-390L

References

External links Britt, Robert Roy (2008-02-14). "Solar System Like Ours Found". Space.com. Retrieved 2008-06-27. "Discovery of a Jupiter/Saturn Analog in OGLE-2006-BLG-109". MicroFUN. Retrieved 2008-06-27. Dominik, Martin (2006-02-11). "The unlonely planets — Discovery of a Jupiter/Saturn analogue". ARTEMiS. Archived from the original on 2012-02-10. Retrieved 2008-06-27. Overbye, Dennis (2008-02-14). "Scientists Find Solar System Like Ours". The New York Times. Retrieved 2008-06-27. Rincon, Paul (2008-04-06). "Solar System's 'look-alike' found". BBC News. Retrieved 2008-06-27. "OGLE-06-109L". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-04-30.

Illustrations

OGLE-2006-BLG-109L: A scheme of the planetary system. — A scheme of the planetary system.

Worked examples

Example 1 — a first encounter with OGLE-2006-BLG-109L

Start with the simplest possible case. Write down what OGLE-2006-BLG-109L 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-2006-BLG-109L 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-2006-BLG-109L 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-2006-BLG-109L

In research: OGLE-2006-BLG-109L 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-2006-BLG-109L 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-2006-BLG-109L is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gravitational lensing, M-type main-sequence stars, Planetary systems with two confirmed planets, so understanding it makes those chapters shorter.
In everyday life: Look for OGLE-2006-BLG-109L 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-2006-BLG-109L in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what OGLE-2006-BLG-109L 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-2006-BLG-109L out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is OGLE-2006-BLG-109L in simple terms?

OGLE-2006-BLG-109L (where the last 'L' stands for lens) is a dim magnitude 17 M0V galactic bulge star approximately 4,920 light-years away in the constellation of Scorpius. Planetary system In 2008, two extrasolar planets were discovered around the star using gravitational microlensing.

Why does OGLE-2006-BLG-109L 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-2006-BLG-109L?

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-2006-BLG-109L.