astronomy

MOA-2008-BLG-310L

MOA-2008-BLG-310L 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-2008-BLG-310L rather than just read about it. In short: MOA-2008-BLG-310L is a 23rd magnitude star located at least 20000 light years away in the constellation Scorpius. This star has mass 0.67 solar masses which imply that it could probably be a late K-type star.

Key takeaways

MOA-2008-BLG-310L 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-2008-BLG-310L to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of MOA-2008-BLG-310L from memory before moving on to harder problems.

Reference excerpt

MOA-2008-BLG-310L is a 23rd magnitude star located at least 20000 light years away in the constellation Scorpius. This star has mass 0.67 solar masses which imply that it could probably be a late K-type star.

Planetary system In 2009 during a microlensing event, a planet was found orbiting this star at a distance of 1.25 AU and has mass 0.23 times that of Jupiter.

See also MOA-2007-BLG-192L OGLE-2005-BLG-390L List of extrasolar planets

References Janczak, Julia; et al. (2010). "Sub-Saturn Planet MOA-2008-BLG-310Lb: Likely To Be In The Galactic Bulge". The Astrophysical Journal. 711 (2): 731–743. arXiv:0908.0529. Bibcode:2010ApJ...711..731J. doi:10.1088/0004-637X/711/2/731. S2CID 119217995. Ingrosso, G.; Calchi Novati, S.; De Paolis, F.; Jetzer, Ph.; Nucita, A. A.; Strafella, F.; Zakharov, A. F. (2012). "Polarization in microlensing events towards the Galactic bulge". Monthly Notices of the Royal Astronomical Society. 426 (2): 1496. arXiv:1208.0174. Bibcode:2012MNRAS.426.1496I. doi:10.1111/j.1365-2966.2012.21820.x. S2CID 118594156.

Worked examples

Example 1 — a first encounter with MOA-2008-BLG-310L

Start with the simplest possible case. Write down what MOA-2008-BLG-310L 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-2008-BLG-310L 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-2008-BLG-310L 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-2008-BLG-310L

In research: MOA-2008-BLG-310L 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-2008-BLG-310L 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-2008-BLG-310L is common in secondary-school and first-year university syllabi. It links to neighbouring topics Exoplanet stubs, G-type main-sequence stars, Gravitational lensing, so understanding it makes those chapters shorter.
In everyday life: Look for MOA-2008-BLG-310L 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-2008-BLG-310L in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what MOA-2008-BLG-310L 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-2008-BLG-310L out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is MOA-2008-BLG-310L in simple terms?

Why does MOA-2008-BLG-310L 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-2008-BLG-310L?

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-2008-BLG-310L.