astronomy

NGC 19

NGC 19 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 19 rather than just read about it. In short: NGC 19 is a spiral galaxy in the Andromeda constellation. Its velocity with respect to the cosmic microwave background is 4,465±23 km/s, which corresponds to a Hubble distance of 214.8 ± 15.1 Mly (65.85 ± 4.62 Mpc).

Key takeaways

NGC 19 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 19 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 19 from memory before moving on to harder problems.

Reference excerpt

NGC 19 is a spiral galaxy in the Andromeda constellation. Its velocity with respect to the cosmic microwave background is 4,465±23 km/s, which corresponds to a Hubble distance of 214.8 ± 15.1 Mly (65.85 ± 4.62 Mpc). However, 12 non-redshift measurements give a closer distance of 202.16 ± 9.32 Mly (61.983 ± 2.857 Mpc). It was discovered by American astronomer Lewis Swift on 20 September 1885. It is often incorrectly listed as a duplicate of NGC 21.

NGC 7831 Group According to A.M. Garcia, NGC 19 is a member of the NGC 7831 group (also known as LGG 1), which contains at least 18 galaxies, including NGC 13, NGC 20, NGC 21, NGC 39 NGC 43, NGC 7805, NGC 7806, NGC 7819, and NGC 7836.

Illustrations

Worked examples

Example 1 — a first encounter with NGC 19

Start with the simplest possible case. Write down what NGC 19 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 19 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 19 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 19

In research: NGC 19 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 19 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 19 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Andromeda (constellation), Astronomical objects discovered in 1885, Barred spiral galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 19 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.

Affiliate

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

How to study NGC 19 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 19 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 19 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 19 in simple terms?

Why does NGC 19 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 19?

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 19.