science

WD 0810−353

WD 0810−353 is a science 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 WD 0810−353 rather than just read about it. In short: WD 0810−353 (UPM J0812−3529) is a white dwarf currently located 36 light-years (11 parsecs) from the Solar System. Based on unreliable radial velocity measurements, this stellar remnant was predicted to approach the Solar System 29,000 years from now at a distance of around 0.15 parsecs, 0.49 light-years or 31,000 AU from the Sun, crossing well within the proposed boundaries of the Oort cloud.

Key takeaways

WD 0810−353 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WD 0810−353 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WD 0810−353 from memory before moving on to harder problems.

Reference excerpt

WD 0810−353 (UPM J0812−3529) is a white dwarf currently located 36 light-years (11 parsecs) from the Solar System. Based on unreliable radial velocity measurements, this stellar remnant was predicted to approach the Solar System 29,000 years from now at a distance of around 0.15 parsecs, 0.49 light-years or 31,000 AU from the Sun, crossing well within the proposed boundaries of the Oort cloud. However, this star is in fact moving away from the Solar System and will not approach.

Characteristics WD 1810−353 is a white dwarf of spectral type DAH with a very strong magnetic field, perhaps as strong as 30 MG. It has a mass of 0.63 M☉ and an age of 2.7 billion years; its effective temperature is 6,093 K or 6,273 K. It is a dim object with an apparent magnitude of 14.5. Its motion perpendicular to the line of sight is considerable; it is consistently listed as a high proper motion star.

Disproven flyby Both the minimum approach distance and the timing of the star's closest flyby depend strongly on the value of the radial velocity. Based on a radal velocity measurement from the Gaia DR3 database, WD 1810−353 is moving towards the Solar System at a velocity of −373.74±8.18 km/s, which together with its proper motions would imply it would approach the Solar System 29,000 years from now at a distance of around 0.15 parsecs (0.49 light-years, 31,000 AU), crossing well within the proposed boundaries of the Oort cloud. Considering the values from Gaia DR3, WD 1810−353 would traverse the Oort cloud, disturbing the population of comets there. Given its mass such an encounter like Gliese 710, would cause a negligible orbital change to the Pluto system and Neptune resonant object. However, this radial velocity was cast in doubt by a 2022 paper, as Gaia does not have the software necessary to accurately derive radial velocity measurements for white dwarfs from the raw data. In this study, an even more extreme radial velocity of −4,248±457 km/s was suggested, implying a closest approach in 2,600 years at a distance of 0.015 parsecs (0.049 ly; 3,100 AU). The extremely high radial velocity could suggest that WD 0810−353 formed after a Type Ia supernova. However, those values, and the flyby as a whole, were disproven in a 2023 study, which find WD 1810−353 is instead moving away from the Solar System, at a velocity of +83±140 km/s.

Notes

References

Illustrations

Worked examples

Example 1 — a first encounter with WD 0810−353

Start with the simplest possible case. Write down what WD 0810−353 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 WD 0810−353 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 WD 0810−353 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 WD 0810−353

In research: WD 0810−353 appears in science 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 WD 0810−353 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: WD 0810−353 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Puppis, White dwarfs, so understanding it makes those chapters shorter.
In everyday life: Look for WD 0810−353 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 WD 0810−353 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WD 0810−353 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 WD 0810−353 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WD 0810−353 in simple terms?

Why does WD 0810−353 matter?

Because it connects several science 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 WD 0810−353?

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 WD 0810−353.