astronomy

NGC 3954

NGC 3954 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 3954 rather than just read about it. In short: NGC 3954 is an elliptical galaxy located 324 million light-years away in the Leo constellation. It was discovered on April 26, 1785, by the astronomer William Herschel.

Key takeaways

NGC 3954 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 3954 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 3954 from memory before moving on to harder problems.

Reference excerpt

NGC 3954 is an elliptical galaxy located 324 million light-years away in the Leo constellation. It was discovered on April 26, 1785, by the astronomer William Herschel. NGC 3954 is a LINER galaxy, and is a member of the NGC 3937 Group. NGC 3954 has a supermassive black hole with an estimated mass of 4.8 × 108 M☉.

NGC 3842 Group

NGC 3947 is part of the NGC 3842 group, the brightest galaxy in this group. The NGC 3842 group contains at least 16 galaxies. The other galaxies in the group are NGC 3805, NGC 3837, NGC 3842, NGC 3860, NGC 3862, NGC 3883, NGC 3884, NGC 3919, NGC 3929, NGC 3937, NGC 3940, NGC 3947, UGC 6697 and UGC 6725, respectively designated 1141+2015 and 1142+2044 for the galaxies CGCG 1141.2+2015 and CGCG 1142.5+2044. The 16th galaxy in the list published by Abraham Mahtessian in 1998 is designated 1134+2015, an unfortunate abbreviated notation that makes galaxy identification difficult and sometimes even impossible, as this one is not included in the NASA/IPAC and Simbad databases. It is possible that 1134+2015 is the galaxy SDSS J114348.22+195830.7, which is north of and very close to UGC 6697. The Hubble distance to this dwarf galaxy is indeed 105.0 ± 7.4 Mpc (~342 million light-years ), and it therefore likely belongs to the NGC 3862 group.

The galaxy north of NGC 3862 is IC 2955. The Hubble distances to these two galaxies are 100.3 ± 7.0 Mpc (~327 million light-years) and 100.8 ± 7.1 Mpc (~329 million light-years) respectively. These two galaxies probably form a pair. IC 2955 is therefore part of the NGC 3842 group.

Leo cluster Like several of the neighboring galaxies, NGC 3947 and the galaxies of the NGC 3842 group are part of the Leo Cluster.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 3954

Start with the simplest possible case. Write down what NGC 3954 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 3954 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 3954 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 3954

In research: NGC 3954 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 3954 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 3954 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1785, Discoveries by William Herschel, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 3954 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 3954 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 3954 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 3954 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 3954 in simple terms?

NGC 3954 is an elliptical galaxy located 324 million light-years away in the Leo constellation. It was discovered on April 26, 1785, by the astronomer William Herschel.

Why does NGC 3954 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 3954?

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 3954.