astronomy

Kepler-1647b

Kepler-1647b 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 Kepler-1647b rather than just read about it. In short: Kepler-1647b (sometimes named Kepler-1647(AB)b to distinguish it from the secondary component) is a circumbinary exoplanet that orbits the binary star system Kepler-1647, located 3,700 light-years (1,100 pc) from Earth in the constellation Cygnus. It was announced on June 13, 2016, in San Diego at a meeting of the American Astronomical Society.

Key takeaways

Kepler-1647b belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Kepler-1647b to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Kepler-1647b from memory before moving on to harder problems.

Reference excerpt

Kepler-1647b (sometimes named Kepler-1647(AB)b to distinguish it from the secondary component) is a circumbinary exoplanet that orbits the binary star system Kepler-1647, located 3,700 light-years (1,100 pc) from Earth in the constellation Cygnus. It was announced on June 13, 2016, in San Diego at a meeting of the American Astronomical Society. It was detected using the transit method, when it caused the dimming of the primary star, and then again of the secondary star blended with the primary star eclipse. The first transit of the planet was identified in 2012, but at the time the single event was not enough to rule out contamination, or confirm it as a planet. It was discovered by the analysis of the Kepler light-curve, which showed the planet in transit.

Characteristics

Mass and orbit The exoplanet is a gas giant, similar in size to Jupiter, and has an orbital period of 1107 days. This is the longest transit period of any confirmed transiting Kepler exoplanet discovered yet. It is also the largest circumbinary Kepler planet known. It is 483±206 times more massive than Earth, and 1.52±0.65 times Jupiter's mass.

Host stars The star system, Kepler-1647 (also known as 2MASS J19523602+4039222, KOI-2939, and KIC 5473556, TIC 170344769 ), is a binary star with the primary star (Kepler-1647 A) having a mass of 1.22 M☉, a radius of 1.79 R☉, and a surface temperature of 6210 ± 100 K. The secondary star (Kepler-1647 B), on the other hand, has a mass of 0.975 M☉, a radius of 1.79 R☉, and a surface temperature of 5770 K. In comparison, the Sun has a surface temperature of 5778 K. The two orbit each other every 11 days. The binary star system's age is estimated to be about 4.4 billion years old, about 200 million years younger than the Sun.

Habitability Kepler-1647b is in the habitable zone of the star system. Since the planet is a gas giant, it is unlikely to host life. However, hypothetical large moons could potentially be suitable for life. Large moons are usually not created during accretion near a gas giant and would likely have to be captured separately, e.g., a passing protoplanet caught into orbit due to the gravitational field of the giant planet. Given that the planet is within the habitable zone, its hypothetical moon would also be. The work showed that the system has the ability to house an Earth-like moon around the gas giant. With that, it would be able to house life as we know it.

See also Kepler-16b Kepler-453b List of circumbinary planets

References

External links Kepler-1647b – NASA Exoplanet Archive

Illustrations

Worked examples

Example 1 — a first encounter with Kepler-1647b

Start with the simplest possible case. Write down what Kepler-1647b 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 Kepler-1647b 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 Kepler-1647b 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 Kepler-1647b

In research: Kepler-1647b 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 Kepler-1647b 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: Kepler-1647b is common in secondary-school and first-year university syllabi. It links to neighbouring topics Circumbinary planets, Cygnus (constellation), Exoplanets discovered by the Kepler space telescope, so understanding it makes those chapters shorter.
In everyday life: Look for Kepler-1647b 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 Kepler-1647b in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kepler-1647b 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 Kepler-1647b out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kepler-1647b in simple terms?

Why does Kepler-1647b 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 Kepler-1647b?

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 Kepler-1647b.