astronomy

NGC 1642

NGC 1642 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 1642 rather than just read about it. In short: NGC 1642 is a spiral galaxy in the constellation of Taurus. Its velocity with respect to the cosmic microwave background is 4575 ± 3 km/s, which corresponds to a Hubble distance of 220.1 ± 15.4 Mly (67.48 ± 4.72 Mpc).

Key takeaways

NGC 1642 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 1642 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1642 from memory before moving on to harder problems.

Reference excerpt

NGC 1642 is a spiral galaxy in the constellation of Taurus. Its velocity with respect to the cosmic microwave background is 4575 ± 3 km/s, which corresponds to a Hubble distance of 220.1 ± 15.4 Mly (67.48 ± 4.72 Mpc). However, one non-redshift measurement gives a much closer distance of 69 Mly (21.3 Mpc). It was discovered by German astronomer Heinrich d'Arrest on 29 December 1861.

NGC 1762 Group According to A.M. Garcia, the galaxy NGC 1642 is part of the NGC 1762 group (also known as LGG 120) that includes at least 27 galaxies, including IC 392, NGC 1590, NGC 1633, NGC 1691, NGC 1713, NGC 1719, and NGC 1762, among others.

Supernova One supernova has been observed in NGC 1642:

SN 2023bhm (Type Ia-91bg-like, mag. 18.1) was discovered by the Zwicky Transient Facility on 2 February 2023.

See also List of NGC objects (1001–2000)

References

External links Media related to NGC 1642 at Wikimedia Commons NGC 1642 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 1642

Start with the simplest possible case. Write down what NGC 1642 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 1642 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 1642 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 1642

In research: NGC 1642 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 1642 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 1642 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1861, Discoveries by Heinrich Louis d'Arrest, IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1642 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 1642 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1642 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 1642 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1642 in simple terms?

Why does NGC 1642 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 1642?

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 1642.