astronomy

IC 485

IC 485 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 IC 485 rather than just read about it. In short: IC 485 is a spiral galaxy located in the constellation of Gemini, located 375 million light years from Earth. It was discovered by the Austrian astronomer, Rudolf Spitaler on March 6, 1891.

Key takeaways

IC 485 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect IC 485 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 485 from memory before moving on to harder problems.

Reference excerpt

IC 485 is a spiral galaxy located in the constellation of Gemini, located 375 million light years from Earth. It was discovered by the Austrian astronomer, Rudolf Spitaler on March 6, 1891. It has an estimated diameter of 1.35' × 0.32' arcmin, meaning the galaxy is about 135,000 light years across. IC 485 is a candidate disc-maser galaxy. It has a projected distance of 122.0 ± 8.5 megaparsecs. The morphology classification of the galaxy is Sa, and it has a low luminous active galactic nucleus (AGN) of LX ~ 5 × 1042 erg s−1. The AGN activity of IC 485 has been debated. It is either classified a LINER or a Seyfert type II galaxy. But its high X-ray luminosity seems to confirm the latter. Using the Karl G. Jansky Very Large Array observations, a team of astronomers led by Jeremy Darling discovered a H2O maser containing a broad multi-component. The maser of IC 485 has a peak flux of 80 mJy with an isotopic luminosity of Liso = (868 ± 46)LΘ. According to Darling, he was also able to find a faint unresolved radio source with its angular resolution measured as 90 milliarcseconds ≈ 50 parsecs. In 2022, the galaxy was further studied by another team of astronomers. They discovered, it has two other 22 GHz H2O maser modules with a velocity separation of 472 km s−1. One is located in the central nuclear region while the other is at a redshifted velocity. Based on estimations on its connection with an edge-on disc, IC 485 has a mass of MBH ~ 1.2 × 107 MΘ. According to estimation of its black hole, the galaxy has a core luminosity of 1 × 1036 - 5 × 1037 erg s−1.

References

Illustrations

Worked examples

Example 1 — a first encounter with IC 485

Start with the simplest possible case. Write down what IC 485 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 IC 485 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 IC 485 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 IC 485

In research: IC 485 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 IC 485 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: IC 485 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Active galaxies, Astronomical objects discovered in 1891, Discoveries by Rudolf Ferdinand Spitaler, so understanding it makes those chapters shorter.
In everyday life: Look for IC 485 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 IC 485 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 485 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 IC 485 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 485 in simple terms?

IC 485 is a spiral galaxy located in the constellation of Gemini, located 375 million light years from Earth. It was discovered by the Austrian astronomer, Rudolf Spitaler on March 6, 1891.

Why does IC 485 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 IC 485?

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 IC 485.