astronomy

UGC 1775

UGC 1775 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 UGC 1775 rather than just read about it. In short: UGC 1775 or Arp 10 is a ring galaxy in the constellation Cetus. The galaxy lies about 400 million light years away from Earth, which means, given its apparent dimensions, that UGC 1775 is approximately 220,000 light years across.

Key takeaways

UGC 1775 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect UGC 1775 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of UGC 1775 from memory before moving on to harder problems.

Reference excerpt

UGC 1775 or Arp 10 is a ring galaxy in the constellation Cetus. The galaxy lies about 400 million light years away from Earth, which means, given its apparent dimensions, that UGC 1775 is approximately 220,000 light years across. The earliest known reference to this galaxy comes from part 3 of the Morphological Catalogue of Galaxies, published in 1963, where it is listed as MCG +01-06-062. The galaxy is included in Halton Arp's Atlas of Peculiar Galaxies in the galaxies with split arms category.

Characteristics The galaxy features a bright ring with a faint bar. Its nucleus is off-centre and it is surrounded by a bright ring of HII regions where new stars are formed. One fainter outer ring or shell also hosts a faint arc of HII regions. The hydrogen emission of the galaxy shows a large disturbed hydrogen disk extending for 2.7 times the optical diameter of the galaxy and features shells. The galaxy has a high star formation rate, which was estimated based on the H-alpha emission to be 5.4 M☉ per year, while based on the infrared luminosity, it is 11.2 M☉ per year. The mid-infrared emission is associated with the nucleus and the star forming regions of the ring. The ring is considered to have been created by another galaxy passing through the disk of the galaxy near its centre about 85 million years ago. As there are no similar mass galaxies visible in the vicinity of UGC 1775 it has been proposed that the non-linear kinematics of the gas in the galaxy are the result of the accretion of a smaller galaxy by a gas-rich spiral galaxy. However more detailed observations indicate that the smaller galaxy is visible as a knot next to the nucleus of the main galaxy. Another small galaxy lying along the minor axis of the galaxy is a background object. The galaxy is seen nearly face-on, at an inclination of 22 degrees.

Supernova One supernova has been observed in UGC 1775. SN 2000dx was a type Ia supernova discovered by the Lick Observatory Supernova Search (LOSS) on 30 October 2000 with an apparent magnitude of 17.3. The supernova was a few days before maximum brightness, located 7.9" east and 12.3" south of the nucleus of UGC 1775.

References

External links UGC 1775 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 UGC 1775

Start with the simplest possible case. Write down what UGC 1775 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 UGC 1775 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 UGC 1775 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 UGC 1775

In research: UGC 1775 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 UGC 1775 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: UGC 1775 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Arp objects, Cetus (constellation), IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for UGC 1775 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 UGC 1775 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what UGC 1775 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 UGC 1775 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is UGC 1775 in simple terms?

Why does UGC 1775 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 UGC 1775?

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 UGC 1775.