astronomy

IC 5145

IC 5145 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 5145 rather than just read about it. In short: IC 5145 is a type Sab spiral galaxy located in the constellation Pegasus. It is located about 328 million light-years from the Solar System.

Key takeaways

IC 5145 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 5145 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 5145 from memory before moving on to harder problems.

Reference excerpt

IC 5145 is a type Sab spiral galaxy located in the constellation Pegasus. It is located about 328 million light-years from the Solar System. It was discovered by Edward Emerson Barnard, although the year he discovered it is unknown. The luminosity class of IC 5145 is I-II and it has a broad H II region. Its dimensions measure 1.60 x 0.9 arcmin.

Supernovae Six supernovae have been discovered in IC 5145:

SN 2002dn (Type Ic, mag. 18.6) was discovered by astronomer W. D. Li from University of California at Berkeley via unfiltered KAIT CCD images taken on June 15 and June 17, 2002. It was located 8".8 west and 18".3 north of the nucleus. A further inspection done by A. V. Filippenko, R. Chornock and R. J. Foley, using the Shane 3-m reflector at Lick Observatory confirmed SN 2002dn was Type Ic, which resembled SN 1987m. SN 2003hy (Type IIn, mag. 16.6) was discovered by British amateur astronomer Tom Boles on September 14, through unfiltered CCD images using a 0.35-m reflector as part of the course done by U.K. Nova/Supernova Patrol. SN 2003hy was also discovered by amateur astronomer Mark Armstrong who saw it on unfiltered CCD images taken with a 0.35m reflector. It was located 5".5 west and 12".5 north of the nucleus. A 14-minute exposure of SN 2003hy taken on December 28, 2003, shows it is much dimmer than 19.4 magnitude, which the dimmest stars are magnitude 20. SN 2010iq (Type Ic, mag. 18.2) was discovered by the Lick Observatory Supernova Search on October 11, 2010. It was reported by A. Narla, S. B. Cenko, W. Li and A. V. Filippenko from University of California, Berkeley through unfiltered CCD images. It was located 2".8 east and 4".4 south of the nucleus. PSN J21542359+1509224 was discovered by Bin Wang and Xing Gao on 13 May 2014. It was located 5".3 east and 0".9 south of the nucleus with a magnitude of 18.3. This supernova had an unknown type. SN 2020pkj (Type Ia, mag. 19.2) was discovered by the Zwicky Transient Facility on 15 July 2020. SN 2022lfa (Type Ic, mag. 19.21) was discovered by the Zwicky Transient Facility on 28 May 2022, using the Palomar 1.2m Oschin telescope on the behalf of K. De from Caltech. On 28 June 2022, astronomers classified it as Type Ic using the 3-m Shane telescope at Lick Observatory.

References

Illustrations

Worked examples

Example 1 — a first encounter with IC 5145

Start with the simplest possible case. Write down what IC 5145 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 5145 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 5145 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 5145

In research: IC 5145 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 5145 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 5145 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Discoveries by Edward Emerson Barnard, IC objects, IRAS catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for IC 5145 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 5145 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 5145 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 5145 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 5145 in simple terms?

IC 5145 is a type Sab spiral galaxy located in the constellation Pegasus. It is located about 328 million light-years from the Solar System.

Why does IC 5145 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 5145?

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 5145.