astronomy

SN 2020oi

SN 2020oi 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 SN 2020oi rather than just read about it. In short: SN 2020oi was a supernova event in the grand design spiral galaxy known as Messier 100, or NGC 4321. It was discovered January 7, 2020 at an apparent magnitude of 17.28 by F.

Key takeaways

SN 2020oi belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SN 2020oi to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SN 2020oi from memory before moving on to harder problems.

Reference excerpt

SN 2020oi was a supernova event in the grand design spiral galaxy known as Messier 100, or NGC 4321. It was discovered January 7, 2020 at an apparent magnitude of 17.28 by F. Forster and associates using the Zwicky Transient Facility. The position places it ~4.67″ north of the galactic nucleus. The supernova was not detected on an observation made three days before the discovery, and thus it must have begun during that brief period. The light curve peaked around January 13–18, depending on the wavelength, then declined rapidly over a period of 25 days before flattening into a more gradual decline. Observations of the spectrum made with the SOAR telescope showed this to be a type Ic supernova, with the progenitor being a massive star that had its outer envelope stripped. The initial velocity of the expanding photosphere was ~15,000 km/s. Models of the event give an initial (zero age main sequence) estimated mass of 9.5±1.0 M☉ or 13 M☉ for the progenitor. It was a member of a binary star system and lost its outer envelope of hydrogen and helium due to interaction with its companion. The resulting helium-poor star was primarily made of carbon and oxygen with a mass of about 2.16 M☉. The supernova explosion was the result of a collapse of an inert iron core. The event ejected 0.71 M☉ of material and left behind a neutron star remnant with a presumed mass of 1.45 M☉. The explosion released about 1051 erg of energy, of which 60% was expended on kinetic energy. This is one of the few type Ic supernovae for which radio emission has been detected. Based on this data, the shock wave from the explosion advanced through the surrounding interstellar matter with a velocity of 3−4×104 km/s. In order to produce the observed emission, the progenitor star underwent mass loss at an average rate of 1.4×10−4 M☉·yr−1 at a typical wind velocity of ~1,000 km/s. Images of the location taken prior to the event using the Hubble Space Telescope show a stellar cluster at that location.

References

Illustrations

Worked examples

Example 1 — a first encounter with SN 2020oi

Start with the simplest possible case. Write down what SN 2020oi 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 SN 2020oi 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 SN 2020oi 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 SN 2020oi

In research: SN 2020oi 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 SN 2020oi 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: SN 2020oi is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2020, Coma Berenices, Messier 100, so understanding it makes those chapters shorter.
In everyday life: Look for SN 2020oi 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 SN 2020oi in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SN 2020oi 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 SN 2020oi out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SN 2020oi in simple terms?

SN 2020oi was a supernova event in the grand design spiral galaxy known as Messier 100, or NGC 4321. It was discovered January 7, 2020 at an apparent magnitude of 17.28 by F.

Why does SN 2020oi 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 SN 2020oi?

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 SN 2020oi.