astronomy

NGC 5857

NGC 5857 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 5857 rather than just read about it. In short: NGC 5857 is a barred spiral galaxy in the constellation of Boötes. Its velocity with respect to the cosmic microwave background for is 4,911±12 km/s, which corresponds to a Hubble distance of 236.3 ± 16.5 Mly (72.44 ± 5.07 Mpc).

Key takeaways

NGC 5857 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 5857 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 5857 from memory before moving on to harder problems.

Reference excerpt

NGC 5857 is a barred spiral galaxy in the constellation of Boötes. Its velocity with respect to the cosmic microwave background for is 4,911±12 km/s, which corresponds to a Hubble distance of 236.3 ± 16.5 Mly (72.44 ± 5.07 Mpc). In addition, 20 non-redshift measurements give a distance of 228.85 ± 2.06 Mly (70.167 ± 0.633 Mpc). It was discovered by German-British astronomer William Herschel on 27 April 1788. The SIMBAD database lists NGC 5857 as a Seyfert II Galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

NGC 5859 Group According to A. M. Garcia, NGC 5857 is a member of the NGC 5859 galaxy group (also known as LGG 394). This group has six members, including NGC 5859, UGC 9620, UGC 9622, UGC 9672, and UGC 9777. Abraham Mahtessian mentions that NGC 5857 and NGC 5859 form a pair of galaxies and they are in gravitational interaction.

Supernovae Two supernovae have been observed in NGC 5857:

SN 1950H (type unknown, mag. 17.6) was discovered by Fritz Zwicky on 17 March 1950. SN 1955M (type unknown, mag. 14.5) was discovered by Fritz Zwicky on 14 May 1955.

See also List of NGC objects (5001–6000)

References

External links Media related to NGC 5857 at Wikimedia Commons NGC 5857 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 5857

Start with the simplest possible case. Write down what NGC 5857 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 5857 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 5857 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 5857

In research: NGC 5857 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 5857 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 5857 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1788, Barred spiral galaxies, Boötes, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 5857 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 5857 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 5857 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 5857 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 5857 in simple terms?

Why does NGC 5857 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 5857?

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 5857.