astronomy

SDSS J102040.84+315510.0

SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0 rather than just read about it. In short: SDSS J102040.84+315510.0 also known as J102040.8+315510.0, RGZ J102040.8+315509 and WISEA J102040.83+315510.2, is a radio galaxy located in the constellation of Leo Minor. The redshift of the galaxy has been estimated to be (z) 0.285.

Key takeaways

SDSS J102040.84+315510.0 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SDSS J102040.84+315510.0 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDSS J102040.84+315510.0 from memory before moving on to harder problems.

Reference excerpt

SDSS J102040.84+315510.0 also known as J102040.8+315510.0, RGZ J102040.8+315509 and WISEA J102040.83+315510.2, is a radio galaxy located in the constellation of Leo Minor. The redshift of the galaxy has been estimated to be (z) 0.285.

Description SDSS J102040.84+315510.0 is a red luminous galaxy residing as the brightest cluster galaxy (BCG) of the galaxy cluster, WHL J102040.8+315510, with at least 18 confirmed galaxy member candidates. The total r-band magnitude of the galaxy has been estimated as 17.65 while its absolute magnitude is -23.15. The g–r color value is 1.58 magnitude. It is an elliptical galaxy. The nucleus is active and it has been categorized as a Fanaroff-Riley Class Type II radio galaxy with the total flux density calculated by the NRAO VLA Sky Survey (NVSS) at 1.4 GHz frequencies being 60.90 mJy. The calculated radio luminosity is 17.0 × 1024 W Hz-1. The radio lobes are resolved, with the first lobe having a length of 140.4 kiloparsecs while the other lobe has a length of 175.3 kiloparsecs. The angular separation of the lobes are estimated to be 18.9 and 23.5 arcseconds respectively. The 1.4 GHz flux densities of the lobes at 3σ cuts obtained by the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST), are found to be 17.3 mJy and 19.9 mJy. It is a bent wide-angle tail (WAT) radio galaxy, with the opening angle of the radio jet estimated to be 156.6° and the jet curvature is 125.9°. The largest linear size of the source is 325.0 kiloparsecs in total. The source is also bent with its bending angle being 2.8° while the excessive bending angle is -6.0°.

References

External links SDSS J102040.84+315510.0 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with SDSS J102040.84+315510.0

Start with the simplest possible case. Write down what SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0

In research: SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0 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: SDSS J102040.84+315510.0 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Elliptical galaxies, LEDA objects, so understanding it makes those chapters shorter.
In everyday life: Look for SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SDSS J102040.84+315510.0 in simple terms?

Why does SDSS J102040.84+315510.0 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 SDSS J102040.84+315510.0?

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 SDSS J102040.84+315510.0.