astronomy

OGLE-2005-BLG-169L

OGLE-2005-BLG-169L 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-2005-BLG-169L rather than just read about it. In short: OGLE-2005-BLG-169L is a dim and distant magnitude 20 galactic bulge star located about 2,700 parsecs away in the constellation Sagittarius. If it is a main sequence star, then it is most likely a red dwarf with about half of the mass of the Sun.

Key takeaways

OGLE-2005-BLG-169L 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-2005-BLG-169L to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of OGLE-2005-BLG-169L from memory before moving on to harder problems.

Reference excerpt

OGLE-2005-BLG-169L is a dim and distant magnitude 20 galactic bulge star located about 2,700 parsecs away in the constellation Sagittarius. If it is a main sequence star, then it is most likely a red dwarf with about half of the mass of the Sun. Other possibilities are a white dwarf star, or (less likely) a neutron star or black hole.

Planetary system In 2006, an Uranus-mass extrasolar planet was detected by gravitational microlensing around this star.

See also List of extrasolar planets OGLE-2005-BLG-390L Optical Gravitational Lensing Experiment or OGLE

References

External links "OGLE-05-169L". Exoplanets. Archived from the original on 2010-03-18. Retrieved 2009-04-30.

Worked examples

Example 1 — a first encounter with OGLE-2005-BLG-169L

Start with the simplest possible case. Write down what OGLE-2005-BLG-169L 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-2005-BLG-169L 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-2005-BLG-169L 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-2005-BLG-169L

In research: OGLE-2005-BLG-169L 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-2005-BLG-169L 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-2005-BLG-169L 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 one confirmed planet, so understanding it makes those chapters shorter.
In everyday life: Look for OGLE-2005-BLG-169L 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-2005-BLG-169L in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what OGLE-2005-BLG-169L 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-2005-BLG-169L out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is OGLE-2005-BLG-169L in simple terms?

Why does OGLE-2005-BLG-169L 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-2005-BLG-169L?

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-2005-BLG-169L.