astronomy

NGC 5953

NGC 5953 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 NGC 5953 rather than just read about it. In short: NGC 5953 is a peculiar spiral galaxy in the constellation Serpens. The galaxy lies about 80 million light years away from Earth, which means, given its apparent dimensions, that NGC 5953 is approximately 35,000 light years across.

Key takeaways

NGC 5953 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 5953 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 5953 from memory before moving on to harder problems.

Reference excerpt

NGC 5953 is a peculiar spiral galaxy in the constellation Serpens. The galaxy lies about 80 million light years away from Earth, which means, given its apparent dimensions, that NGC 5953 is approximately 35,000 light years across. It was discovered by William Herschel on April 17, 1784. NGC 5953 interacts with NGC 5954 forming a pair known as Arp 91.

Characteristics

NGC 5953 is an unbarred spiral galaxy seen face on with many dust lanes. Two tidal plumes are visible, one to the northwest and one to the south of the galaxy. The spiral arms are flocculent and appear fragmented and are associated with star formation regions. The galaxy has recently undergone intense star formation in the circumnuclear region around the nucleus where there are huge HII regions, probably as a result of its interaction with NGC 5954. The large HII region has been found to emit radio waves, appearing as a discrete source 5 arcseconds from the nucleus. A circumnuclear star ring with a diameter of 10–14 arcseconds is visible, which coincides with a disk of CO gas. Based on near infrared observations the ring hosts a red giant but not hot gas. The total star formation rate of the galaxy is estimated to be 2.56 ± 0.1 M☉ per year.

Active nucleus The nucleus of the galaxy has been found to be active and it is categorised as a type 2 Seyfert galaxy or as a LINER. The most accepted theory for the energy source of active galactic nuclei is the presence of an accretion disk around a supermassive black hole. The black hole in the nucleus of NGC 5953 is estimated to have a mass of 7×106 M☉ based on velocity dispersion. A jet is visible to the north of the nucleus in radio waves extending for 0.3 arcseconds, which corresponds to a projected distance of 40 parsecs in the distance of the galaxy.

Nearby galaxies NGC 5953 forms a pair with another spiral galaxy, NGC 5954, which lies 43 arcminutes away. The interaction has distorted NGC 5954. The pair is part of the NGC 5962 group or LGG 400. Other members of the group, apart from NGC 5962, include UGC 9925 and UGC 9951. A bit further away lie NGC 5951, NGC 5956, and NGC 5957.

References

External links

NGC 5953 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 NGC 5953

Start with the simplest possible case. Write down what NGC 5953 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 NGC 5953 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 NGC 5953 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 NGC 5953

In research: NGC 5953 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 NGC 5953 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: NGC 5953 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arp objects, Astronomical objects discovered in 1784, Discoveries by William Herschel, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 5953 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 NGC 5953 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 5953 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 NGC 5953 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 5953 in simple terms?

Why does NGC 5953 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 NGC 5953?

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 NGC 5953.