science

NGC 2194

NGC 2194 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 NGC 2194 rather than just read about it. In short: NGC 2194 is an open cluster of stars in the constellation of Orion. The cluster is located about 10,000 light years away from Earth.

Key takeaways

NGC 2194 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 2194 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 2194 from memory before moving on to harder problems.

Reference excerpt

NGC 2194 is an open cluster of stars in the constellation of Orion. The cluster is located about 10,000 light years away from Earth. It is rich and moderately concentrated. The cluster lies 33 arcminutes west-northwest of 73 Orionis.

Observation history It was discovered by William Herschel on 11 February 1784, and it was added in his catalogue as IV 5. It was added to the General Catalogue as 1383. The cluster was also observed by Adolph Cornelius Petersen in 1849 with the 18 cm refractor at the Altona Observatory. The cluster was also observed by Hermann Carl Vogel, without mentioning its General Catalogue number. John Louis Emil Dreyer added it to GCS as number 5380, as Heinrich Louis d'Arrest's discovery from 18 September 1862, without noticing it was already included.

Characteristics NGC 2194 is a rich and moderately concentrated, with Trumpler class III1r, open cluster. The brightest stars of the cluster are of magnitude 10, the brightest being of magnitude 10.26. The cluster has 149 members down to 15th magnitude. The main sequence turn off is at magnitude 14.5 and there are few red giants members. There are some stars that are bluer than the turn-off point and if they are members of the cluster they are possibly blue stragglers. The photometric study of the cluster by Sanner and al. concluded that the age of the cluster is 550 Myr and its distance is 2,900 pc. Piatti et al. determined the age of the cluster to be 400 Myr and its distance to be 3,200 pc. The cluster has low metallicity (−0.27 ± 0.06). It is located 130 pc south of the galactic plane.

Research In the summer of 2025, NASA SEES interns Abdullah Pehlari, Luis Aceves-Ramirez, Yashica Balasubramanian, Rodrigo Burguete, Ashwin Krishnamurthy, and Cindy Wang conducted a photometric study of NGC 2194. Using broadband B (blue), V (visual/green), and R (red) filters with exposure times of 3 and 120 seconds, they analyzed 817 stars within the cluster. Their results revised the cluster’s distance to 1,076.17 parsecs (3,510 ly) and determined an age of about 30 million years, substantially younger than previous estimates. To study the stellar distribution, the researchers divided NGC 2194 into concentric regions centered on the cluster. The densest concentration of stars was found in the inner region, predominantly consisting of F-, G-, K-, and numerous M-type stars with temperatures ranging from approximately 2,000 to 7,000 K. Moving outward, the second and third regions were dominated by A- and F-type stars (~7,500–10,000 K), although cooler G- and K-type stars were also present, and a small number of O- and B-type stars were detected. The fourth and fifth regions were more sparsely populated, primarily by cooler K- and M-type stars. Surrounding the cluster, an outer halo contained faint K- and M-type stars. A color–magnitude diagram (CMD) and Hertzsprung–Russell (H–R) diagram revealed that most stars lie along the main sequence, confirming that they are in the hydrogen-fusion stage. A clear turnoff point near spectral type B–A indicated where the more massive stars are beginning to evolve off the main sequence. Comparison with zero-age main sequence (ZAMS) models yielded a cluster age of approximately 30 million years.

The full dataset of 817 stars, including magnitudes, corrected color indices, and spectral classifications, has been archived and is publicly available for further analysis.

References

External links NGC 2194 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

Illustrations

NGC 2194: Zero-age main sequence (ZAMS) fitting of NGC 2194, produced by NASA SEES interns in 2025. — Zero-age main sequence (ZAMS) fitting of NGC 2194, produced by NASA SEES interns in 2025.

Worked examples

Example 1 — a first encounter with NGC 2194

Start with the simplest possible case. Write down what NGC 2194 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 NGC 2194 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 NGC 2194 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 NGC 2194

In research: NGC 2194 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 NGC 2194 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: NGC 2194 is common in secondary-school and first-year university syllabi. It links to neighbouring topics NGC objects, Open clusters, Orion (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for NGC 2194 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 NGC 2194 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 2194 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 NGC 2194 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 2194 in simple terms?

NGC 2194 is an open cluster of stars in the constellation of Orion. The cluster is located about 10,000 light years away from Earth.

Why does NGC 2194 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 NGC 2194?

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 NGC 2194.