astronomy

WISE J2354+0240

WISE J2354+0240 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 J2354+0240 rather than just read about it. In short: WISE J2354+0240 (WISE J235402.77+024015.0, WISE 2354+0240) is a brown dwarf or free-floating planetary-mass object. It is a Y-dwarf, meaning it is one of the coldest directly imaged astronomical objects.

Key takeaways

WISE J2354+0240 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 J2354+0240 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WISE J2354+0240 from memory before moving on to harder problems.

Reference excerpt

WISE J2354+0240 (WISE J235402.77+024015.0, WISE 2354+0240) is a brown dwarf or free-floating planetary-mass object. It is a Y-dwarf, meaning it is one of the coldest directly imaged astronomical objects. It was discovered in 2015, using the Wide-field Infrared Survey Explorer and spectroscopy from the Hubble Space Telescope. The authors find that the J-band peak in the spectrum is narrower than the Y0 standard and therefore assigned a spectral type of Y1, with an estimated temperature of 300−400 Kelvin. The age was estimated to be at least 1.5 billion years. Parallax measurement places this object at 7.7 parsec from the Solar System. Near-infrared photometry was later obtained with Hubble and a temperature of 335±11 K and a mass of 11±3 MJ was estimated. WISE 2354+0240 was observed with the James Webb Space Telescope and the temperature was estimated to be 362+10−12 K. The object is not described in detail in this work. The authors however mention that they see a number of absorption features in their sample, including water vapor, methane, ammonia, carbon monoxide and carbon dioxide. They note that none of their objects show absorption due to phosphine, which is predicted to occur in these objects. An analysis of nearby stellar associations and open clusters found that WISE 2354+0240 has a 85.2% probability of belonging to the group HSC517, which does result in a mass estimate of 2.5+2.0−1.3 MJ. This is one of the lowest mass estimates in their list.

See also List of Y-dwarfs WISE 0825+2805 another Y-dwarf discovered by Schneider et al. 2015

Notes

References

Illustrations

Worked examples

Example 1 — a first encounter with WISE J2354+0240

Start with the simplest possible case. Write down what WISE J2354+0240 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 J2354+0240 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 J2354+0240 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 J2354+0240

In research: WISE J2354+0240 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 J2354+0240 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 J2354+0240 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2015, Pisces (constellation), Rogue planets, so understanding it makes those chapters shorter.
In everyday life: Look for WISE J2354+0240 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 J2354+0240 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WISE J2354+0240 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 J2354+0240 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WISE J2354+0240 in simple terms?

Why does WISE J2354+0240 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 J2354+0240?

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 J2354+0240.