astronomy

PSR J0740+6620

PSR J0740+6620 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 J0740+6620 rather than just read about it. In short: PSR J0740+6620 is a neutron star in a binary system with a white dwarf, located 4,600 light years away in the Milky Way galaxy. It was discovered in 2019, by astronomers using the Green Bank Telescope in West Virginia, U.S., and confirmed as a rapidly rotating millisecond pulsar.

Key takeaways

PSR J0740+6620 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 J0740+6620 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PSR J0740+6620 from memory before moving on to harder problems.

Reference excerpt

PSR J0740+6620 is a neutron star in a binary system with a white dwarf, located 4,600 light years away in the Milky Way galaxy. It was discovered in 2019, by astronomers using the Green Bank Telescope in West Virginia, U.S., and confirmed as a rapidly rotating millisecond pulsar. It completes spin period of 2.8857 milliseconds and is characteristic age of 3.75 billion years old. It is among the most massive neutron stars ever observed – with 2.08+0.07−0.07 M☉ placing it near the boundary of the theoretical maximum. Its mass was calculated via the Shapiro delay of its white dwarf companion as it passed edge-on to Earth. It was the record holder for the heaviest NS until July 2022 when the title was taken by PSR J0952–0607 with a reported mass of 2.35+0.17−0.17 M☉. PSR J0740+6620 is estimated to measure 12.39+1.30−0.98 km (7.70+0.81−0.61 mi).

See also PSR B1913+16 PSR B1957+20 (1.66-2.4 M☉) Neutron Star Interior Composition Explorer (NICER) List of the most massive neutron stars

References

External links Susanna Kohler (15 September 2021). "More Insight into Neutron Star Interiors". AASnova.

Illustrations

Worked examples

Example 1 — a first encounter with PSR J0740+6620

Start with the simplest possible case. Write down what PSR J0740+6620 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 J0740+6620 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 J0740+6620 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 J0740+6620

In research: PSR J0740+6620 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 J0740+6620 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 J0740+6620 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Astronomical objects discovered in 2019, Binary stars, Camelopardalis, so understanding it makes those chapters shorter.
In everyday life: Look for PSR J0740+6620 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 J0740+6620 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PSR J0740+6620 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 J0740+6620 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PSR J0740+6620 in simple terms?

Why does PSR J0740+6620 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 J0740+6620?

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 J0740+6620.