astronomy

NGC 4388

NGC 4388 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 4388 rather than just read about it. In short: NGC 4388 is an active spiral galaxy in the equatorial constellation of Virgo. This galaxy is located at a distance of 57 million light years and is receding with a radial velocity of 2,524km/s.

Key takeaways

NGC 4388 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 4388 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 4388 from memory before moving on to harder problems.

Reference excerpt

NGC 4388 is an active spiral galaxy in the equatorial constellation of Virgo. This galaxy is located at a distance of 57 million light years and is receding with a radial velocity of 2,524km/s. It is one of the brightest galaxies of the Virgo Cluster due to its luminous nucleus. NGC 4388 is located 1.3° to the west of the cluster center, which translates to a projected distance of ≈400 kpc. The NGC 4388 galaxy has been assigned a morphological class of SA(s)b, which indicates it is a spiral with no central bar (SA) or inner ring structure (s), and has moderately-wound spiral arms (b). It is inclined at an angle of 79° to the line of sight from the Earth and thus is being viewed from nearly edge-on. The major axis of the elliptical profile is aligned with a position angle of 92°. It was discovered by German-British astronomer William Herschel on April 17, 1784.

Characteristics The interstellar medium of the galaxy has recently undergone a stripping event due to ram pressure, causing star formation to steeply decline some 190±30 Myr ago. The galaxy may have passed close to the cluster center around 200 Myr ago, which led to the loss of much of its neutral hydrogen from interaction with the inter-cluster medium. This is a classic Type II Seyfert galaxy where the emission from the active galactic nucleus is being concealed by a torus of obscuring gas and dust. The supermassive black hole at the core has a mass of (8.5±0.2)×106 M☉, which has a hot corona with a temperature energy of 80+40−20 keV that is producing X-ray emission. There is a strong nuclear outflow to the north and south that extends out as far as 5 kpc from the core. These flows have a mean velocity of 270±70 km·s−1. NGC 4388 has a large extended emission-line region (EELR) that has a length of around 35 kpc, stretching beyond the galaxy. This emission cloud is created when the supermassive black hole is active and its radiation ionizes gas from its galaxy. In the case of NGC 4388 it is suggested that the gas was first stripped from the galaxy either via tidal interaction or via ram pressure and later ionized. A small H II region, known as the GAFO Region, ionised by a 3.3 million years old star cluster, is located within this region.

Supernova One supernova has been observed in NGC 4388: SN 2023fyq (Type Ibn, mag. 19.5 at discovery) was discovered by the Zwicky Transient Facility on 17 April 2023. The supernova brightened slowly from discovery until 24 July 2023, when Kōichi Itagaki photographed it at magnitude 13.3. Originally classified as a Type Ib-pec, it was later designated as Type Ibn.

Gallery

See also List of NGC objects (4001–5000)

References

External links Media related to NGC 4388 at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with NGC 4388

Start with the simplest possible case. Write down what NGC 4388 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 4388 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 4388 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 4388

In research: NGC 4388 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 4388 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 4388 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1784, Discoveries by William Herschel, IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 4388 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 4388 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 4388 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 4388 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 4388 in simple terms?

NGC 4388 is an active spiral galaxy in the equatorial constellation of Virgo. This galaxy is located at a distance of 57 million light years and is receding with a radial velocity of 2,524km/s.

Why does NGC 4388 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 4388?

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 4388.