astronomy

J082504.56+315957.0

J082504.56+315957.0 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 J082504.56+315957.0 rather than just read about it. In short: J082504.56+315957.0 also known as OGC 407 and 0821+321, is a giant elliptical galaxy located in the constellation of Cancer. The redshift of the galaxy is (z) 0.265 and it is classified as a low-excitation radio galaxy with a young compact steep spectrum (CSS) source.

Key takeaways

J082504.56+315957.0 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect J082504.56+315957.0 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of J082504.56+315957.0 from memory before moving on to harder problems.

Reference excerpt

J082504.56+315957.0 also known as OGC 407 and 0821+321, is a giant elliptical galaxy located in the constellation of Cancer. The redshift of the galaxy is (z) 0.265 and it is classified as a low-excitation radio galaxy with a young compact steep spectrum (CSS) source.

Description J082504.56+315957.0 is an elliptical galaxy with an approximate r-band luminosity of 10.1 magnitude based on its r-band estimation made by the Sloan Digital Sky Survey (SDSS). The nucleus is active and has been classified as a low-ionization nuclear emission-line region or a LINER galaxy. The total star formation of the galaxy is 2.98 M☉ per year and it has a stellar mass of 11.93 M☉. The supermassive black hole lying in the center of the galaxy has a mass of 9.66 M☉. The radio source of the galaxy has a low luminosity and is mainly compact. It is also classified as a double-lobed source with the presence of two weak radio lobes that have no prominent hot spot features and a resolved radio core. The total flux density has been calculated as 0.076 Jy at 1.4 GHz frequencies, while the total radio luminosity has been found to be 25.21 W Hz−1 at 4.85 GHz. The largest linear size of the source is 7.69 kiloparsecs. Gamma-ray emissions are present in the galaxy although mainly weak, with a gamma-ray flux of less than 0.18 × 10−9 ph cm−2 s−1 and gamma-ray luminosity of less than 0.50 × 1044 erg s−1.

References

External links J082504.56+315957.0 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images J082504.56+315957.0 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with J082504.56+315957.0

Start with the simplest possible case. Write down what J082504.56+315957.0 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 J082504.56+315957.0 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 J082504.56+315957.0 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 J082504.56+315957.0

In research: J082504.56+315957.0 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 J082504.56+315957.0 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: J082504.56+315957.0 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Cancer (constellation), Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for J082504.56+315957.0 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 J082504.56+315957.0 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what J082504.56+315957.0 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 J082504.56+315957.0 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is J082504.56+315957.0 in simple terms?

Why does J082504.56+315957.0 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 J082504.56+315957.0?

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 J082504.56+315957.0.