astronomy

MOA-2007-BLG-400L

MOA-2007-BLG-400L 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-400L rather than just read about it. In short: MOA-2007-BLG-400L is a star located 22472.1 light-years (6890 parsecs) away in the constellation of Sagittarius. This star is presumed to be a red dwarf with a spectral type of M3V, based on its mass of 0.35 M☉.

Key takeaways

MOA-2007-BLG-400L 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-400L to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MOA-2007-BLG-400L from memory before moving on to harder problems.

Reference excerpt

MOA-2007-BLG-400L is a star located 22472.1 light-years (6890 parsecs) away in the constellation of Sagittarius. This star is presumed to be a red dwarf with a spectral type of M3V, based on its mass of 0.35 M☉.

Planetary system In September 2008, the discovery of an extrasolar planet was announced by the Microlensing Follow Up Network (μFUN) and the Microlensing Observations in Astrophysics (MOA) Collaboration. This planet was detected by the gravitational microlensing method based on an event recorded in September 2007.

See also List of extrasolar planets MOA-2007-BLG-192L

References Dong, Subo; et al. (2009). "Microlensing Event MOA-2007-BLG-400: Exhuming the Buried Signature of a Cool, Jovian-Mass Planet" (abstract). The Astrophysical Journal. 698 (2): 1826–1837. arXiv:0809.2997. Bibcode:2009ApJ...698.1826D. doi:10.1088/0004-637X/698/2/1826. S2CID 16658501.web preprint

External links MOA-2007-BLG-400 Event

Worked examples

Example 1 — a first encounter with MOA-2007-BLG-400L

Start with the simplest possible case. Write down what MOA-2007-BLG-400L 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-400L 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-400L 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-400L

In research: MOA-2007-BLG-400L 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-400L 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-400L 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 MOA-2007-BLG-400L 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-400L in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MOA-2007-BLG-400L 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-400L out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MOA-2007-BLG-400L in simple terms?

Why does MOA-2007-BLG-400L 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-400L?

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-400L.