astronomy

NGC 2748

NGC 2748 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 2748 rather than just read about it. In short: NGC 2748 is a spiral galaxy in the northern circumpolar constellation of Camelopardalis, located at a distance of 61.3 megalight-years from the Milky Way. It was discovered September 2, 1828 by British astronomer John Herschel.

Key takeaways

NGC 2748 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 2748 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 2748 from memory before moving on to harder problems.

Reference excerpt

NGC 2748 is a spiral galaxy in the northern circumpolar constellation of Camelopardalis, located at a distance of 61.3 megalight-years from the Milky Way. It was discovered September 2, 1828 by British astronomer John Herschel.

Characteristics The morphological classification of SAbc indicates NGC 2748 is an unbarred spiral with moderate to loosely-wound spiral arms. It is a disk-like peculiar galaxy with a stellar shell that is rotating about the main galactic axis. This shell was most likely formed through the capture and disruption of a dwarf companion. The galactic nucleus likely contains a supermassive black hole with a mass of 4.4+3.5−3.6×107 M☉, or 44 million times the mass of the Sun.

NGC 2655 group NGC 2748 is part of the NGC 2655 group (also known as LGG 165). Other galaxies in this group are NGC 2591, NGC 2715, UGC 4466, UGC 4701, and UGC 4714.

Supernovae and Luminous Red Nova Four supernovae and one luminous red nova have been observed in NGC 2748.

SN 1985A (Type Ia, mag. 14.5) was discovered by Thomas Schildknecht on January 25, 1985, located 3″ west and 10″ south of the galaxy's nucleus. SN 2013ff (Type Ic, mag. 16) was discovered by Raffaele Belligoli and Flavio Castellani on August 31, 2013. It was positioned 19″ west and 21″ north of the core of NGC 2748, and eventually reached magnitude 15.2. AT 2015fx (type LRN, mag. 18.3) was discovered by Kōichi Itagaki on 10 February 2015. The transient was originally classified as a luminous blue variable, a type of supernova impostor. Later analysis concluded that it was actually a luminous red nova. SN 2017gkk (Type IIb, mag. 14.7) was discovered by MASTER on 19 August 2017, and independently by Kōichi Itagaki on 31 August 2017. SN 2026yly (Type II, mag. 15.4) was discovered by Kōichi Itagaki on 9 August 2026.

See also List of NGC objects (2001–3000)

References

External links Media related to NGC 2748 at Wikimedia Commons Images Spectral data Supermassive black hole mass measurements for NGC 1300 and NGC 2748 based on HST emission-line gas kinematics

Illustrations

Worked examples

Example 1 — a first encounter with NGC 2748

Start with the simplest possible case. Write down what NGC 2748 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 2748 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 2748 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 2748

In research: NGC 2748 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 2748 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 2748 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1828, Camelopardalis, Discoveries by John Herschel, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 2748 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 2748 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 2748 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 2748 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 2748 in simple terms?

Why does NGC 2748 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 2748?

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 2748.