astronomy

WISE 2150−7520

WISE 2150−7520 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 WISE 2150−7520 rather than just read about it. In short: WISE 2150−7520 AB (abbreviated W2150AB) is a binary brown dwarf 78.9 light-years distant from Earth in the southern constellation Octans. The system is a wide binary with a separation of 341 astronomical units.

Key takeaways

WISE 2150−7520 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WISE 2150−7520 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WISE 2150−7520 from memory before moving on to harder problems.

Reference excerpt

WISE 2150−7520 AB (abbreviated W2150AB) is a binary brown dwarf 78.9 light-years distant from Earth in the southern constellation Octans. The system is a wide binary with a separation of 341 astronomical units. The primary of the system was discovered in 2005 as an infrared object with high proper motion and in 2008 was found to be an ultracool dwarf with a spectral type of L. The secondary, a much cooler T dwarf, was discovered by volunteers of the citizen science project Backyard Worlds: Planet 9, using data from the Wide-field Infrared Survey Explorer (WISE). The system was followed up by the project scientists with Magellan and Spitzer and a scientific paper describing the binary was published in the Astrophysical Journal in 2020. The system belongs to only a few brown dwarf binaries that can be easily resolved by ground-based telescopes. Another example is SDSS J1416+1348.

Brown dwarf system The system consists out of a L1 primary with a mass of 72±12 MJ and a T8 secondary with a mass of 34±22 MJ. The brown dwarfs are separated by 341 astronomical units. Other brown dwarfs show a similar wide binary configuration, like Oph 162225-240515, but most of them are young or have a higher total mass. W2150AB is unusual as it does not show signs of youth. The age of the system was estimated between 0.5 and 10 billion years. The combination of low total mass and large separation results in a low gravitational binding energy for the system. The researchers compared the binding energy and the mass ratio of the system with other brown dwarf binaries and found 2M1101AB as a younger sibling. W2150AB must have formed like other brown dwarf binaries in a more crowded region and left this natal region surviving any interactions with nearby stars or giant molecular clouds that could easily perturb this pair, leaving only two single brown dwarfs.

Gallery

See also LSPM J0207+3331 another object discovered by a Backyard Worlds volunteer UScoCTIO 108 Luhman 16

References

External links W2150AB in wiseview tool created by Backyard Worlds volunteers W2150B in The Extrasolar Planets Encyclopaedia

Illustrations

Worked examples

Example 1 — a first encounter with WISE 2150−7520

Start with the simplest possible case. Write down what WISE 2150−7520 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 WISE 2150−7520 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 WISE 2150−7520 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 WISE 2150−7520

In research: WISE 2150−7520 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 WISE 2150−7520 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: WISE 2150−7520 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Binary stars, Brown dwarfs, L-type brown dwarfs, so understanding it makes those chapters shorter.
In everyday life: Look for WISE 2150−7520 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 WISE 2150−7520 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WISE 2150−7520 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 WISE 2150−7520 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WISE 2150−7520 in simple terms?

Why does WISE 2150−7520 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 WISE 2150−7520?

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 WISE 2150−7520.