astronomy

PSR J1719−1438

PSR J1719−1438 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 PSR J1719−1438 rather than just read about it. In short: PSR J1719−1438 is a millisecond pulsar with a spin period of 5.7901 ms and is characteristic age of 11.4 billion years old located about 3,900 light years (1,200 parsecs) from Earth in the direction of Serpens Cauda, one minute from the border with Ophiuchus. Millisecond pulsars are generally thought to begin as normal pulsars and then spin up by accreting matter from a binary companion.

Key takeaways

PSR J1719−1438 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PSR J1719−1438 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PSR J1719−1438 from memory before moving on to harder problems.

Reference excerpt

PSR J1719−1438 is a millisecond pulsar with a spin period of 5.7901 ms and is characteristic age of 11.4 billion years old located about 3,900 light years (1,200 parsecs) from Earth in the direction of Serpens Cauda, one minute from the border with Ophiuchus. Millisecond pulsars are generally thought to begin as normal pulsars and then spin up by accreting matter from a binary companion.

Diamond planet

PSR J1719−1438 was discovered in 2011 by the High Time Resolution Survey, a radio astronomy search for astronomical objects that rapidly vary in radio brightness, such as pulsars. Timing measurements using the Parkes Telescope and Lovell Telescope showed that it has a low-mass companion: PSR J1719−1438 b. The companion has a mass similar to that of Jupiter, but 40% of the diameter. It orbits the pulsar with a period of 2 hours 10 minutes and 37 seconds, at a distance of around 600,000 km (0.89 solar radii). The companion is likely the remnant of a star whose outer layers were siphoned off by the more massive pulsar. Calculations show the companion has a minimum density of 23 grams per cubic centimeter and is probably an ultra-low-mass carbon–oxygen white dwarf. Because the companion to PSR J1719−1438 is planet-sized, made primarily of carbon (with an unknown amount of oxygen), and very dense, it may be similar to a large diamond. In the science press, the object has been called the "Diamond Planet".

A lump of QCD matter It has been suggested in 2012 that PSR J1719−1438 b may not be the remnant of a white dwarf, but a lump of quark matter with a size of just 1 kilometer and the mass of Jupiter, that would have been born in the collision and merger of two previous quark stars, part of the ejected matter ending orbiting the merger remnant we see as the pulsar PSR J1719−1438.

See also Black widow pulsar – Class of millisecond pulsarsPages displaying short descriptions of redirect targets EF Eridani, a star system with a compact star and a degraded planetary-mass former star PSR J1544+4937 – Millisecond pulsar in the constellation Boötes

References

Illustrations

Worked examples

Example 1 — a first encounter with PSR J1719−1438

Start with the simplest possible case. Write down what PSR J1719−1438 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 PSR J1719−1438 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 PSR J1719−1438 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 PSR J1719−1438

In research: PSR J1719−1438 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 PSR J1719−1438 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: PSR J1719−1438 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2011, Millisecond pulsars, Planetary systems with one confirmed planet, so understanding it makes those chapters shorter.
In everyday life: Look for PSR J1719−1438 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 PSR J1719−1438 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PSR J1719−1438 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 PSR J1719−1438 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PSR J1719−1438 in simple terms?

Why does PSR J1719−1438 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 PSR J1719−1438?

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 PSR J1719−1438.