astronomy

NGC 1333

NGC 1333 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 NGC 1333 rather than just read about it. In short: NGC 1333 is a reflection nebula located in the northern constellation Perseus, positioned next to the southern constellation border with Taurus and Aries. It was first discovered by German astronomer Eduard Schönfeld in 1855.

Key takeaways

NGC 1333 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NGC 1333 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NGC 1333 from memory before moving on to harder problems.

Reference excerpt

NGC 1333 is a reflection nebula located in the northern constellation Perseus, positioned next to the southern constellation border with Taurus and Aries. It was first discovered by German astronomer Eduard Schönfeld in 1855. The nebula is visible as a hazy patch in a small telescope, while a larger aperture will show a pair of dark nebulae designated Barnard 1 and Barnard 2. It is associated with a dark cloud L1450 (Barnard 205). Estimates of the distance to this nebula range from 980–1,140 ly (300–350 pc). This nebula is in the western part of the Perseus molecular cloud and is a young region of very active star formation, being one of the best-studied objects of its type. It contains a fairly typical hierarchy of star clusters that are still embedded in the molecular cloud in which they formed, which are split into two main sub-groups to the north and south. Most of the infrared emission is happening in the southern part of the nebula. A significant portion of the stars seen in the infrared are in the pre-main sequence stage of their evolution. The nebula region has a combined mass of approximately 450 M☉, while the cluster contains around 150 stars with a median age of a million years and a combined mass of 100 M☉. The average star formation rate is 1×10−4 M☉ yr–1. Within the nebula are 20 young stellar objects producing outflows, including Herbig–Haro objects, and a total of 95 X-ray sources that are associated with known members of embedded star clusters. In 2011 researchers reported finding 30 to 40 brown dwarf objects in the cloud and in the Rho Ophiuchi cloud complex. 15 objects with a spectral type of M9 or later were discovered in NGC 1333. This spectral type corresponds to a mass of a planetary-mass object (PMO) at the age of NGC 1333. About 42% of the PMO are surrounded by a circumstellar disk, but only one out of six objects with a spectral type of L0 (about 10 MJ) or later has a disk. Scholz et al. argues that this indicates that very low mass PMOs form like planets (aka ejected planets) and not like stars (also called sub-brown dwarfs). Parker & Alves de Oliveira on the other hand argue that the distribution of PMOs in NGC 1333 follows N-body simulations of objects that form like stars and that none of the PMOs has a peculiar motion, which is predicted for ejected planets. They also note that ejected planets are hiding in this and other star-forming regions. Additional PMOs were discovered by Scholz et al. 2012 with Subaru (e.g. SONYC-NGC1333-36 with estimated 6 MJ) and by Langeveld et al. 2024 with JWST (6 objects and one JuMBO candidate). Langeveld et al. did not find any object below 4 MJ, despite JWST being sensitive enough to detect these objects. This could mean that star-formation does not occur below 4 MJ, which is consistent with previous observations in most star-forming regions and the nearby stellar population. One source, called NIRISS-NGC1333-5 (NN5), shows infrared excess, which is an indication of a disk around the object. With a mass of 5 MJ, this object could be one of the lowest mass object with a disk known so far.

Gallery

References

External links

Agrupació Astronòmica d'Eivissa (AAE) Cala d'Hort Telescope (TCH) Spitzer Space Telescope page on NGC 1333 NASA Astronomy Picture of the Day: Dusty NGC 1333 (24 November 2005) NASA Astronomy Picture of the Day: In the Center of Reflection Nebula NGC 1333 (21 May 2007) Amateur photography See NGC1333 in WorldWide Telescope

Illustrations

Worked examples

Example 1 — a first encounter with NGC 1333

Start with the simplest possible case. Write down what NGC 1333 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 NGC 1333 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 1333 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 1333

In research: NGC 1333 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 NGC 1333 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 1333 is common in secondary-school and first-year university syllabi. It links to neighbouring topics NGC objects, Perseus (constellation), Reflection nebulae, so understanding it makes those chapters shorter.
In everyday life: Look for NGC 1333 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 1333 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NGC 1333 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 1333 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NGC 1333 in simple terms?

Why does NGC 1333 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 NGC 1333?

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 1333.