astronomy

NGC 1233

NGC 1233 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 1233 rather than just read about it. In short: NGC 1233 (also listed as NGC 1235) is a spiral galaxy in the constellation of Perseus. Its velocity with respect to the cosmic microwave background is 4218 ± 14 km/s, which corresponds to a Hubble distance of 202.9 ± 14.2 Mly (62.22 ± 4.36 Mpc).

Key takeaways

NGC 1233 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 1233 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1233 from memory before moving on to harder problems.

Reference excerpt

NGC 1233 (also listed as NGC 1235) is a spiral galaxy in the constellation of Perseus. Its velocity with respect to the cosmic microwave background is 4218 ± 14 km/s, which corresponds to a Hubble distance of 202.9 ± 14.2 Mly (62.22 ± 4.36 Mpc). In addition, three non redshift measurements give a distance of 211.35 ± 2.14 Mly (64.800 ± 0.656 Mpc). The galaxy was discovered by French astronomer Édouard Stephan on 10 December 1871. It is also thought to have been observed by Lewis Swift on 21 October 1886, and later listed as NGC 1235.

Supernovae Three supernovae have been observed in NGC 1233:

SN 2009lj (Type Ic, mag. 19) was discovered by the Lick Observatory Supernova Search (LOSS) on 13 November 2009. SN 2017lf (Type Ia, mag. 17.3) was discovered by the Tsinghua-NAOC Transient Survey (TNTS) on 22 January 2017. SN 2022bqi (Type II, mag. 17) was discovered by Giancarlo Cortini on 7 February 2022.

NGC 1207 Group NGC 1233 is a part of the 3 member NGC 1207 group (also known as LGG 83). The other two galaxies in the group are NGC 1207 and UGC 2604.

See also List of NGC objects (1001–2000)

References

External links Media related to NGC 1233 at Wikimedia Commons NGC 1233 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 1233

Start with the simplest possible case. Write down what NGC 1233 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 1233 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 1233 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 1233

In research: NGC 1233 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 1233 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 1233 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1871, Discoveries by Édouard Stephan, IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1233 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 1233 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1233 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 1233 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1233 in simple terms?

Why does NGC 1233 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 1233?

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 1233.