astronomy

NGC 6753

NGC 6753 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 6753 rather than just read about it. In short: NGC 6753 is a massive unbarred spiral galaxy, seen almost exactly face-on, in the southern constellation of Pavo. It was discovered by the English astronomer John Herschel on July 5, 1836.

Key takeaways

NGC 6753 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 6753 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 6753 from memory before moving on to harder problems.

Reference excerpt

NGC 6753 is a massive unbarred spiral galaxy, seen almost exactly face-on, in the southern constellation of Pavo. It was discovered by the English astronomer John Herschel on July 5, 1836. The galaxy is located at a distance of 142 million light years from the Milky Way, and is receding with a heliocentric radial velocity of 3,140 km/s. It does not display any indications of a recent interaction with another galaxy or cluster. The morphological class of NGC 6753 is (R)SA(r)b, indicating it is a spiral without an inner bar feature (SA), displaying outer (R) and inner (r) ring structures, and moderately wound spiral arms. It is being viewed nearly face-on with a galactic plane inclination by 30° to the line of sight from the Earth. The galaxy is flocculent in appearance with a prominent central region. The virial mass of the galaxy is ~1×1013 M☉, while the stellar mass is 3.2×1011 M☉. It has a star formation rate of 15.5 M☉·yr−1, which is confined to a radius of 15 kpc around the core. The most active region of star formation is the inner ring. It has a hot, X-ray luminous corona that extends out to a radius of 50 kpc.

Supernovae Three supernovae have been discovered in NGC 6753:

SN 2000cj was discovered by Robert Evans on May 14, 2000. It was positioned against a spiral arm at an offset 35″ east and 19″ south of the galaxy nucleus. The spectrum showed this to be a Type Ia supernova. On May 13, 2005, Type Ic supernovae SN 2005cb was spotted by the Brazilian Supernovae Search team. It was offset 16″ west and 19″ north of the nucleus and reached a peak magnitude of 15.6. The Type II-P supernova SN 2019mhm was discovered by the BOSS team on August 2, 2019. This transient was spotted close to maximum with a magnitude of 16.6, but showed no radio emission.

See also List of NGC objects (6001–7000)

References

External links Media related to NGC 6753 at Wikimedia Commons Rojas, Sebastián García. "Galaxy NGC 6753 - Spiral Galaxy in Pavo Constellation · Deep Sky Objects Browser". DSO Browser. Archived from the original on 18 September 2017. Retrieved 18 September 2017.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 6753

Start with the simplest possible case. Write down what NGC 6753 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 6753 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 6753 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 6753

In research: NGC 6753 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 6753 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 6753 is common in secondary-school and first-year university syllabi. It links to neighbouring topics NGC objects, Pavo (constellation), Unbarred spiral galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 6753 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 6753 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 6753 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 6753 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 6753 in simple terms?

NGC 6753 is a massive unbarred spiral galaxy, seen almost exactly face-on, in the southern constellation of Pavo. It was discovered by the English astronomer John Herschel on July 5, 1836.

Why does NGC 6753 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 6753?

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 6753.