science

IC 2395

IC 2395 is a science 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 2395 rather than just read about it. In short: IC 2395 is an open cluster in the constellation Vela. Observation history It is possible that entry III.3 of the catalogue of Nicolas Louis de Lacaille, often listed as missing, is IC 2395.

Key takeaways

IC 2395 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect IC 2395 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of IC 2395 from memory before moving on to harder problems.

Reference excerpt

IC 2395 is an open cluster in the constellation Vela.

Observation history It is possible that entry III.3 of the catalogue of Nicolas Louis de Lacaille, often listed as missing, is IC 2395. According to Lacaille's entry, the object consists of a "Star of 6th magnitude, connected to another more southern one by a nebulous trace", and gives the coordinates RA=08:42.2, Dec=-48:04. These coordinates are 2' west and 1' south of the location of van den Bergh-Hagen 47 according to Sky Catalogue 2000.0, which is within the cluster's diameter. Lacaille observed it on February 17, 1752. The cluster was discovered independently in 1908 by Solon Irving Bailey. Sidney van den Bergh and Gretchen Luft Hagen catalogued also this cluster in 1975. The coordinates of vdBH 47 are in fair agreement with the coordinates of IC 2395, although because Lund placed IC 2395 in an inaccurate position, Sky Catalogue 2000.0, Deep Sky Field Guide and the first edition of Uranometria list two different clusters. The fact that they are the same cluster is also supported by Clariá et al. who estimated its angular diameter at 19 arcminutes.

Characteristics IC 2395 is an open cluster of poor to moderate richness. 45 stars located within the central part of the cluster are considered to be possible members. The radius core radius of the cluster is 0.53 parsecs (1.6 light years), while the tidal radius is 4.5 - 7.9 parsecs (15 - 26 light years) and represents the average outer limit of IC 2395, beyond which a star is unlikely to remain gravitationally bound to the cluster core. IC 2395 is a young stellar cluster being between 6 and 18 million years old. Based on its young age and distance, it is possible that IC 2395 is part of the Vela OB1C stellar association. The brightest member of the cluster has mag 5.53, and its bluest main sequence star is of spectral type B5. One of the members of the cluster is a candidate Be star. One member, HD 74339 (mag. 9.3, spectral type B2/3 II/III), is a beta Cephei variable.

References

External links IC 2395 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

Worked examples

Example 1 — a first encounter with IC 2395

Start with the simplest possible case. Write down what IC 2395 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 2395 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 2395 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 2395

In research: IC 2395 appears in science 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 2395 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 2395 is common in secondary-school and first-year university syllabi. It links to neighbouring topics IC objects, Open clusters, Vela (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for IC 2395 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 2395 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what IC 2395 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 2395 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is IC 2395 in simple terms?

IC 2395 is an open cluster in the constellation Vela. Observation history It is possible that entry III.3 of the catalogue of Nicolas Louis de Lacaille, often listed as missing, is IC 2395.

Why does IC 2395 matter?

Because it connects several science 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 2395?

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 2395.