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SN 1994D

SN 1994D 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 1994D rather than just read about it. In short: SN 1994D was a Type Ia supernova event on the outskirts of galaxy NGC 4526, which was discovered on 7 March 1994. Observation It was offset by 9.0″ west and 7.8″ south of the galaxy center and positioned near a prominent dust lane.

SN 1994D — main illustration
SN 1994D — illustration

Key takeaways

  • SN 1994D 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 1994D to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of SN 1994D from memory before moving on to harder problems.

Reference excerpt

SN 1994D was a Type Ia supernova event on the outskirts of galaxy NGC 4526, which was discovered on 7 March 1994.

Observation

It was offset by 9.0″ west and 7.8″ south of the galaxy center and positioned near a prominent dust lane. It was caused by the explosion of a white dwarf star composed of carbon and oxygen. The event was discovered on 7 March 1994 by R. R. Treffers and associates using the automated 30-inch telescope at Leuschner Observatory. It reached peak visual brightness, magnitude 11.9, two weeks later on March 22. Modelling of the light curve indicates the explosion would have been visible around March 3–4. A possible detection of helium in the spectrum was made by W. P. S. Meikle and associates in 1996. A mass of 0.014 to 0.03 M☉ in helium would be needed to produce this feature.

See also History of supernova observation

References

Further reading Branch, David; et al. (June 2005). "Comparative Direct Analysis of Type Ia Supernova Spectra. I. SN 1994D". The Publications of the Astronomical Society of the Pacific. 117 (832): 545–552. arXiv:astro-ph/0503165. Bibcode:2005PASP..117..545B. doi:10.1086/430135. S2CID 15250772.

External links

Illustrations

SN 1994D illustration
SN 1994D: Light curves in four photometric bands for SN 1994D, adapted from Richmond et al. (1995)[3]
Light curves in four photometric bands for SN 1994D, adapted from Richmond et al. (1995)[3]

Worked examples

Example 1 — a first encounter with SN 1994D

Start with the simplest possible case. Write down what SN 1994D 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 1994D 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 1994D 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 1994D

In research
SN 1994D 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 1994D 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 1994D is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1994 in outer space, Astronomical objects discovered in 1994, Type Ia supernovae, so understanding it makes those chapters shorter.
In everyday life
Look for SN 1994D 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 1994D in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what SN 1994D means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain SN 1994D out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SN 1994D in simple terms?

SN 1994D was a Type Ia supernova event on the outskirts of galaxy NGC 4526, which was discovered on 7 March 1994. Observation It was offset by 9.0″ west and 7.8″ south of the galaxy center and positioned near a prominent dust lane.

Why does SN 1994D 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 1994D?

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 1994D.

Tags

  • 1994 in outer space
  • Astronomical objects discovered in 1994
  • Type Ia supernovae
  • Virgo (constellation)

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