astronomy

NGC 2935

NGC 2935 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 2935 rather than just read about it. In short: NGC 2935 is a large intermediate spiral galaxy located in the constellation Hydra. Its speed relative to the cosmic microwave background is 2,601 ± 23 km/s, which corresponds to a Hubble distance of 38.4 ± 2.7 Mpc (~125 million ly).

Key takeaways

NGC 2935 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 2935 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 2935 from memory before moving on to harder problems.

Reference excerpt

NGC 2935 is a large intermediate spiral galaxy located in the constellation Hydra. Its speed relative to the cosmic microwave background is 2,601 ± 23 km/s, which corresponds to a Hubble distance of 38.4 ± 2.7 Mpc (~125 million ly). It was discovered by German-British astronomer William Herschel on 20 March 1786. NGC 2935 was used by Gérard de Vaucouleurs as a galaxy of morphological type (R2')SAB(s)b in his galaxy atlas. The luminosity class of NGC 2935 is II and it has a broad HI line. In addition, it is a star-forming burst galaxy. To date, 29 studies and measurements based on redshift give a distance of 27.890 ± 3.962 Mpc (~91 million ly), which is outside the Hubble distance values. Note that it is with the average value of independent measurements, when they exist, that the NASA/IPAC database calculates the diameter of a galaxy and that consequently the diameter of NGC 2935 could be approximately 78, 1 kpc (~255,000 ly) if we used the Hubble distance to calculate it.

Nuclei disk Observations from the Hubble Space Telescope have concluded that a star-forming disk is present around the core of NGC 2935. The size of its semi-major axis is estimated at 530 pc (~1730 light years) at the estimated distance of this galaxy.

Supernovae Four supernovae have been discovered in NGC 2935:

SN 1975F (type unknown, mag. 15) was discovered by Yvonne Dunlap and Justus R. Dunlap of the Corralitos Observatory at Northwestern University on 11 June 1975. SN 1996Z (Type Ia, mag. 16) was discovered by Wayne Johnson on 16 May 1996. SN 2021mwj (Type II, mag. 17.674) was discovered by ATLAS on 21 May 2021. SN 2021aczp (Type II, mag. 18.878) was discovered by ATLAS on 1 November 2021.

NGC 2935 Group NGC 2935 is part of a small group of three galaxies named after it. The other two galaxies in the NGC 2935 group are NGC 2983 and NGC 2986.

See also List of NGC objects (2001–3000) New General Catalogue List of spiral galaxies

External links NGC 2935 at NASA/IPAC NGC 2935 at SIMBAD NGC_2935 at LEDA

References

Illustrations

Worked examples

Example 1 — a first encounter with NGC 2935

Start with the simplest possible case. Write down what NGC 2935 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 2935 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 2935 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 2935

In research: NGC 2935 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 2935 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 2935 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Discoveries by William Herschel, ESO objects, Galaxies discovered in 1786, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 2935 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 2935 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 2935 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 2935 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 2935 in simple terms?

Why does NGC 2935 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 2935?

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 2935.