astronomy

IC 758

IC 758 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 758 rather than just read about it. In short: IC 758 is a barred spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is 1,402±9 km/s, which corresponds to a Hubble distance of 67.4 ± 4.7 Mly (20.67 ± 1.45 Mpc).

Key takeaways

IC 758 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 758 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 758 from memory before moving on to harder problems.

Reference excerpt

IC 758 is a barred spiral galaxy in the constellation of Ursa Major. Its velocity with respect to the cosmic microwave background is 1,402±9 km/s, which corresponds to a Hubble distance of 67.4 ± 4.7 Mly (20.67 ± 1.45 Mpc). However, two non-redshift measurements give a much farther distance of 87.08 ± 11.09 Mly (26.700 ± 3.400 Mpc). It was discovered by American astronomer Lewis Swift on 17 April 1888. IC 758 is an active galactic nucleus candidate, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.

NGC 4036 Group According to A.M. Garcia, IC 758 is one of five members of the NGC 4036 galaxy group (also known as LGG 266), which includes NGC 4036, NGC 4041, UGC 7009, and UGC 7019. A more recent study claims this group has 13 members, adding the galaxies NGC 3945, PGC 37567, PGC 38027, PGC 2608163, PGC 4001456, PGC 4001735, PGC 4011191, and PGC 4074702. The NGC 4036 Group is part of the Ursa Major Cloud, which is part of the Virgo Supercluster.

Supernova One supernova has been observed in IC 758: SN 1999bg (Type II, mag. 15.5) was discovered by the Lick Observatory Supernova Search (LOSS) on 28 March 1999.

Illustrations

Worked examples

Example 1 — a first encounter with IC 758

Start with the simplest possible case. Write down what IC 758 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 758 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 758 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 758

In research: IC 758 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 758 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 758 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 1888, Barred spiral galaxies, Discoveries by Lewis Swift, so understanding it makes those chapters shorter.
In everyday life: Look for IC 758 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 758 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 758 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 758 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 758 in simple terms?

Why does IC 758 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 758?

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 758.