astronomy

J171328.4+274336.6

J171328.4+274336.6 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 J171328.4+274336.6 rather than just read about it. In short: J171328.4+274336.6 also known as OGC 49 and SDSS J171328.4+274336.6 is a massive elliptical galaxy located in the constellation of Hercules. The redshift (z) of the galaxy is estimated to be 0.297.

Key takeaways

J171328.4+274336.6 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect J171328.4+274336.6 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of J171328.4+274336.6 from memory before moving on to harder problems.

Reference excerpt

J171328.4+274336.6 also known as OGC 49 and SDSS J171328.4+274336.6 is a massive elliptical galaxy located in the constellation of Hercules. The redshift (z) of the galaxy is estimated to be 0.297.

Description J171328.4+274336.6 is an elliptical galaxy with an R-band luminosity of 14.9 based on the luminosity value estimated by the Sloan Digital Sky Survey (SDSS). It is also one of the most massive galaxies, with an R-band absolute magnitude that is -24.28, and an R-band size that is 1.08 kiloparsecs (kpc). The total velocity dispersion for this galaxy is estimated to be 412 kilometers per second. The galaxy is categorized as a "core" early-type galaxy with a galaxy effective radius of 4.49 parsecs and has an ellipticity of 0.171 ± 0.013. The dynamical mass of the galaxy is 12.09 M☉. The supermassive black hole lying in the center of the galaxy is estimated to have a mass of 9.40 M☉ based on an M-sigma relation. The galaxy also has a total stellar mass of 42.7 M☉, with it also being surrounded by a dark matter halo, with a dark matter component contributing 3% of the dispersion velocity. The half-light radius is calculated to be 11.2 kiloparsecs based on fitting an i-band de Vaucouleurs profile. The de Vaucouleurs luminosity is -24.597 magnitude. The bulge-to-total ratio is 0.566, while both the bulge and disk radius is 7.67 and 18.67 kiloparsecs respectively, based on the de Vaucouleurs bulge plus exponential disk model. Dust has not been detected in the galaxy. The surface brightness profile is estimated to be 1372.29 based on a core-sersic parameter.

References

External links J171328.4+274336.6 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 J171328.4+274336.6

Start with the simplest possible case. Write down what J171328.4+274336.6 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 J171328.4+274336.6 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 J171328.4+274336.6 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 J171328.4+274336.6

In research: J171328.4+274336.6 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 J171328.4+274336.6 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: J171328.4+274336.6 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Elliptical galaxies, Hercules (constellation), LEDA objects, so understanding it makes those chapters shorter.
In everyday life: Look for J171328.4+274336.6 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “J171328.4+274336.6” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study J171328.4+274336.6 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what J171328.4+274336.6 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 J171328.4+274336.6 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is J171328.4+274336.6 in simple terms?

J171328.4+274336.6 also known as OGC 49 and SDSS J171328.4+274336.6 is a massive elliptical galaxy located in the constellation of Hercules. The redshift (z) of the galaxy is estimated to be 0.297.

Why does J171328.4+274336.6 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 J171328.4+274336.6?

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 J171328.4+274336.6.