astronomy

V424 Lacertae

V424 Lacertae 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 V424 Lacertae rather than just read about it. In short: V424 Lacertae (V424 Lac), also named Tengshe, is a red supergiant and a variable star in the constellation Lacerta. It is a member of the Lacerta OB1 stellar association.

Key takeaways

V424 Lacertae belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect V424 Lacertae to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of V424 Lacertae from memory before moving on to harder problems.

Reference excerpt

V424 Lacertae (V424 Lac), also named Tengshe, is a red supergiant and a variable star in the constellation Lacerta. It is a member of the Lacerta OB1 stellar association.

The MK spectral type of V424 Lac has been determined to be K5, but it has also been classified as M0. It was discovered to be slightly variable using analysis of Hipparcos photometry. The total range is less than a tenth of a magnitude. Multiple short periods are detected, as well as slow variations with a period of 1,100 or 1,601 days. Although listed in the General Catalogue of Variable Stars as a slow irregular variable, it has been considered to be either a semiregular variable or long secondary period variable. There is an ultraviolet excess from V424 Lacertae, that may be due to an unseen companion, which could also explain the long secondary period. On this assumption, a low-mass stellar companion in a 1,382 day 6.2 AU orbit has been suggested. This star was part of the ancient Chinese constellation Tengshe (螣蛇, Flying Serpent), dating back to the 2nd century BCE. The IAU Working Group on Star Names approved the name Tengshe for this star on 19 September 2024 and it is now so entered in the IAU Catalog of Star Names.

References

Illustrations

Worked examples

Example 1 — a first encounter with V424 Lacertae

Start with the simplest possible case. Write down what V424 Lacertae 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 V424 Lacertae 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 V424 Lacertae 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 V424 Lacertae

In research: V424 Lacertae 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 V424 Lacertae 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: V424 Lacertae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bright Star Catalogue objects, Durchmusterung objects, Henry Draper Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for V424 Lacertae 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 V424 Lacertae in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what V424 Lacertae 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 V424 Lacertae out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is V424 Lacertae in simple terms?

V424 Lacertae (V424 Lac), also named Tengshe, is a red supergiant and a variable star in the constellation Lacerta. It is a member of the Lacerta OB1 stellar association.

Why does V424 Lacertae 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 V424 Lacertae?

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 V424 Lacertae.