astronomy

NGC 5054

NGC 5054 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 5054 rather than just read about it. In short: NGC 5054 is a spiral galaxy in the constellation Virgo. The galaxy lies about 55 million light years away from Earth based on redshift-independent methods, which means, given its apparent dimensions, that NGC 5054 is approximately 85,000 light years across.

Key takeaways

NGC 5054 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 5054 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 5054 from memory before moving on to harder problems.

Reference excerpt

NGC 5054 is a spiral galaxy in the constellation Virgo. The galaxy lies about 55 million light years away from Earth based on redshift-independent methods, which means, given its apparent dimensions, that NGC 5054 is approximately 85,000 light years across. Based on redshift the galaxy lies about 80 million light years away. It was discovered by William Herschel on December 31, 1785. It is included in the Herschel 400 Catalogue. It lies about 6 degrees southwest of Spica and near the star 53 Virginis.

Characteristics

NGC 5054 has a bright nucleus which hosts a nuclear bar making the bulge appear elliptical. The galaxy has three prominent spiral arms in a grand design pattern. The arms emerge from the inner disk spaced about 120 degrees apart. The arms are loosely wrapped around, with the northern arm appearing more tightly wrapped. The arms can be traced for about half a revolution before fading. Many star forming knots are visible in spiral arms. The largest HII regions are about two arcseconds across. The star formation rate of the galaxy is estimated to be 2.6 M☉ per year. In the centre of the galaxy lies a supermassive black hole, whose mass is estimated to be 106.62 ± 0.36 (1.8 - 9.5 millions) M☉, based on the pitch angle of the spiral arms.

Supernovae Three supernovae have been observed in NGC 5054:

SN 2004ab was discovered on 21 February 2004 by Berto Monard at an apparent magnitude of 14.7 2" west and 11" north from the centre of the galaxy. It was identified as a Type Ia supernova about one week past maximum. The supernova was highly reddened. SN 2014A was discovered on 1 January 2014 by Lick Observatory Supernova Search using the Katzman Automatic Imaging Telescope at an apparent magnitude of 16.4. It was identified as a Type II supernova more than a month past explosion. SN 2018is was discovered on 20 January 2018 at an apparent red magnitude of 17.9. It was identified as a low-luminosity Type II-P supernova with an atypically steep decline during the photospheric phase and remarkably narrow emission lines.

Nearby galaxies NGC 5054 lies at the outskirts of the NGC 5044 Group. The difference in redshift between NGC 5054 and the group is -919 ± 61 km/s. Makarov et al place NGC 5054 in the same cloud with the NGC 5044 Group, however belonging to a different group, the NGC 5054 Group, along with NGC 5037 and some other fainter galaxies. A Magellanic galaxy is seen superimposed on the northern arm of the galaxy, 2.7 arcminutes from the centre. It is possible that the interaction of the two galaxies has resulted in star formation in the dwarf galaxy and could be cause of the peculiar arm morphology of NGC 5054. It is also possible that the peculiar shape is the result of the interaction of the galaxy with the extended halo of the NGC 5044 group.

References

External links

NGC 5054 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images NGC 5054 on SIMBAD

Illustrations

Worked examples

Example 1 — a first encounter with NGC 5054

Start with the simplest possible case. Write down what NGC 5054 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 5054 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 5054 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 5054

In research: NGC 5054 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 5054 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 5054 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1785, Discoveries by William Herschel, MCG objects, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 5054 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 5054 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 5054 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 5054 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 5054 in simple terms?

Why does NGC 5054 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 5054?

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 5054.