astronomy

NGC 1395

NGC 1395 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 1395 rather than just read about it. In short: NGC 1395 is an elliptical galaxy located in the constellation Eridanus. It is located at a distance of circa 75 million light years from Earth, which, given its apparent dimensions, means that NGC 1395 is about 130,000 light years across.

Key takeaways

NGC 1395 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 1395 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1395 from memory before moving on to harder problems.

Reference excerpt

NGC 1395 is an elliptical galaxy located in the constellation Eridanus. It is located at a distance of circa 75 million light years from Earth, which, given its apparent dimensions, means that NGC 1395 is about 130,000 light years across. It was discovered by William Herschel on November 17, 1784. It is a member of the Eridanus Cluster.

Characteristics In the centre of NGC 1395 lies a supermassive black hole whose mass is estimated to be 3.9×108 (108.59) M☉ based on the M–sigma relation or between 100 and 257 million (108 – 108.41) M☉ based on the Sérsic index of the galaxy. NGC 1395 emits X-rays which have been observed by Chandra X-ray Observatory and XMM-Newton. The luminosity of the galaxy in X-rays is 3×1040 ergs and is believed it is emitted by hot gas with total mass 4.1×108 M☉. One other source of X-ray emission in early type galaxies are X-ray binary stars, with 24 sources being detected in the inner area of NGC 1395. NGC 1395 is home to a large number of globular clusters, with their total number estimated to be 6000±1100, compared to 150–200 in and around the Milky Way. There are two different populations of globular clusters in the galaxy, named blue and red from their photometric color. The clusters of the red subpopulation lie closer to the centre of the galaxy while the blue ones lie mostly in the halo. The surface density profile of the blue globular clusters indicates that the galaxy has accreted a significant number of dwarf satellites. David Malin and Dave Carter discovered in 1983 low contrast shells in the bright envelope of NGC 1395. The brightest shell lies 3 arcminutes northwest of the galactic centre. A perpendicular feature is seen also in deep imaging in the northwest part of the galaxy. Features like these are indicative of recent accretion of a smaller galaxy in the recent past.

Nearby galaxies NGC 1395 is part of the Eridanus Cluster and is the brightest member of the NGC 1395 subgroup. Other members of this subgroup are the galaxies IC 1952, NGC 1401, NGC 1414, NGC 1415, NGC 1422, NGC 1426, NGC 1438, and NGC 1439.

References

External links

NGC 1395 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images NGC 1395 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with NGC 1395

Start with the simplest possible case. Write down what NGC 1395 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 1395 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 1395 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 1395

In research: NGC 1395 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 1395 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 1395 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1784, Discoveries by William Herschel, Elliptical galaxies, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1395 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 1395 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1395 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 1395 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1395 in simple terms?

Why does NGC 1395 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 1395?

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 1395.