astronomy

WISE 0825+2805

WISE 0825+2805 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 0825+2805 rather than just read about it. In short: WISE 0825+2805 (WISE J082507.35+280548.5) is a free-floating planetary-mass object or a brown dwarf. It is a Y dwarf with a spectral type of Y0.5.

Key takeaways

WISE 0825+2805 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 0825+2805 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WISE 0825+2805 from memory before moving on to harder problems.

Reference excerpt

WISE 0825+2805 (WISE J082507.35+280548.5) is a free-floating planetary-mass object or a brown dwarf. It is a Y dwarf with a spectral type of Y0.5. It is about 21.4 light-years away from Earth in the Cancer constellation. It is a potential member (93% chance) of the Corona of Ursa Major (CUMA) moving group, a collection of young stars that are 414±23 million years old.

Discovery WISE 0825+2805 was discovered in 2015 by Schneider et al. with the Wide-field Infrared Survey Explorer and the Hubble Space Telescope, using WFC3 near-infrared grism spectroscopy. The team also announced the discovery of three T-dwarfs as well as two additional Y-dwarfs (WISE J1206+8401 and WISE J2354+0240) in the same paper.

Physical properties WISE 0825+2805 has been observed with the James Webb Space Telescope's NIRCam and MIRI instruments. A best-fit model of WISE 0825+2805's spectral energy distribution (SED) indicates that its atmosphere is phosphine-free and diabatic. A good-fitting SED model requires an effective temperature of 350 Kelvin and a surface gravity of log g = 4.0. Alternatively, a lower surface gravity could improve the SED fit. The model parameters correspond to a mass of 5 MJ and an age of 800 Myr. On the other hand, if WISE 0825+2805 has the same age as the Corona of Ursa Major moving group (414±23 Myr), then the best-fit SED indicates a mass of 3.7±0.2 MJ, a radius of 1.144±0.002 RJ, a surface gravity of 103.85±0.02 cgs and an effective temperature of 359 ± 3 K (86 ± 3 °C; 187 ± 5 °F). However, a 2026 study found little evidence that WISE 0825+2805 is part of any moving group, and atmospheric retrievals indicate a mass of 11+2−3 MJ, a radius of 1.11±0.02 RJ, a surface gravity of 104.33+0.07−0.09 cgs and an effective temperature of 363 ± 3 K (90 ± 3 °C; 194 ± 5 °F). The position of WISE 0825+2805 in the surface gravity-temperature diagram then indicates an age of 2 Gyr.

See also List of Y-dwarfs List of star systems within 20–25 light-years

References

Illustrations

Worked examples

Example 1 — a first encounter with WISE 0825+2805

Start with the simplest possible case. Write down what WISE 0825+2805 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 0825+2805 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 0825+2805 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 0825+2805

In research: WISE 0825+2805 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 0825+2805 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 0825+2805 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2015, Brown dwarfs, Cancer (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for WISE 0825+2805 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 0825+2805 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WISE 0825+2805 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 0825+2805 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WISE 0825+2805 in simple terms?

WISE 0825+2805 (WISE J082507.35+280548.5) is a free-floating planetary-mass object or a brown dwarf. It is a Y dwarf with a spectral type of Y0.5.

Why does WISE 0825+2805 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 0825+2805?

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 0825+2805.