astronomy

GJ 3323

GJ 3323 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 GJ 3323 rather than just read about it. In short: GJ 3323, also known as LHS 1723, is a nearby star. It is located in the equatorial constellation Eridanus, about 0.4° to the northwest of the naked eye star Psi Eridani.

Key takeaways

GJ 3323 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect GJ 3323 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GJ 3323 from memory before moving on to harder problems.

Reference excerpt

GJ 3323, also known as LHS 1723, is a nearby star. It is located in the equatorial constellation Eridanus, about 0.4° to the northwest of the naked eye star Psi Eridani. It is invisible to the naked eye with an apparent visual magnitude 12.20. Parallax measurements give a distance of 17.5 light-years (5.4 parsecs). It is drifting further away with a radial velocity of +42.3 km/s. Roughly 104,000 years ago, the star is believed to have come to within 7.34 ± 0.16 light-years of the Solar System. The stellar classification of GJ 3323 is M4.0Ve, indicating that it is a red dwarf, with emission lines appearing in its spectrum. It is fully convective and a source of X-ray emission. The star has 17% of the Sun's mass, 19% of the radius of the Sun, and just 0.4% of the Sun's luminosity.

History of observations The discovery name of this star is LP 656-38, which indicates that its discovery was published between 1963 and 1981 in University of Minnesota, Minneapolis. "LP" means "Luyten, Palomar". GJ 3323 is known at least from 1979, when catalogues of high proper motion objects LHS and NLTT were published by Willem Jacob Luyten, and this object was included to these catalogues.

Distance measurement In 1982, Wilhelm Gliese published a photometric distance of GJ 3323 (161 mas), and in 1991 it was included in the 3rd preliminary version of catalogue of nearby stars by Gliese and Jahreiss as NN 3323 (also designated as GJ 3323) with photometric parallax 163.0±26.0 mas. Its trigonometric parallax remained unknown until 2006, when it was published by the RECONS team. The parallax was 187.92±1.26 mas.

Planetary system On March 15, 2017, two planets orbiting GJ 3323 were detected by the HARPS telescope, although the discovery team considers GJ 3323 c a planet candidate.

References

Worked examples

Example 1 — a first encounter with GJ 3323

Start with the simplest possible case. Write down what GJ 3323 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 GJ 3323 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 GJ 3323 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 GJ 3323

In research: GJ 3323 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 GJ 3323 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: GJ 3323 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Eridanus (constellation), Gliese and GJ objects, M-type main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for GJ 3323 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 GJ 3323 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GJ 3323 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 GJ 3323 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GJ 3323 in simple terms?

GJ 3323, also known as LHS 1723, is a nearby star. It is located in the equatorial constellation Eridanus, about 0.4° to the northwest of the naked eye star Psi Eridani.

Why does GJ 3323 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 GJ 3323?

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 GJ 3323.