astronomy

KOI-868.01

KOI-868.01 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 KOI-868.01 rather than just read about it. In short: KOI-868.01, also known by its Kepler Input Catalog designation KIC 6867155.01, is a Saturn-sized exoplanet candidate that orbits the M-type star KOI-868, located approximately 1,315 light years away in the constellation of Cygnus. Host star The planet candidate orbits the dim red dwarf star KOI-868, which has a spectral type of M1V.

Key takeaways

KOI-868.01 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect KOI-868.01 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KOI-868.01 from memory before moving on to harder problems.

Reference excerpt

KOI-868.01, also known by its Kepler Input Catalog designation KIC 6867155.01, is a Saturn-sized exoplanet candidate that orbits the M-type star KOI-868, located approximately 1,315 light years away in the constellation of Cygnus.

Host star The planet candidate orbits the dim red dwarf star KOI-868, which has a spectral type of M1V. The star has an apparent visual magnitude of 15.643, and is roughly 1,300 light years away in the constellation of Cygnus. The star has an effective temperature of 3,822 K. KOI-868 has a radius of 0.53 solar radii (R☉; 370,000 km), and has a mass of 0.55 solar masses (M☉; 1.09×1030 kg).

Characteristics KOI-868.01 is similar in size to Saturn with an estimated radius of 0.945 RJ, or a diameter of roughly 120,000 kilometers. The unconfirmed planet has a mass of 0.689 MJ, or 219.1 M🜨. The potential planet orbits its star in 236 days at a distance of 0.65 astronomical units. The planet candidate is located within the habitable zone of its star, and has an equilibrium temperature of 188 K (−85 °C; −121 °F). The planet was first suggested to exist as a Kepler Object of Interest (KOI) in 2013 after observations with the Kepler Space Telescope using the transit method.

Existence KOI-868.01 is currently categorized as a planet candidate by the NASA Exoplanet Archive (NEA). In 2026, it was found that KOI-868.01 is an extremely promising candidate, along with several others, and further studies could confirm the existence of this planet.

Potential ring system In 2018, it was discovered that KOI-868.01 may host rings due to an anomaly during the transits. Using the data from the transit, the study found that the predicted rings potentially extend up to 88,000 kilometers from the surface of the planet. It was found that the hypothetical rings would be stable for over 3 billion years. However, with only two transits, the existence of rings is unlikely, and the anomalies observed is believed to be caused by stellar activity.

Possible exomoon In 2015, David Kipping discovered using transit timing variations (shortened as TTVs) that a potential exomoon may orbit KOI-868.01 in the Hunt for Exomoons with Kepler (abbreviated as HEK) project. The possible exomoon, which is named KOI-868.01 I, would have a radius of 1.23 R🜨, and a mass of 0.31 M🜨. The candidate exomoon would orbit approximately 0.0221 astronomical units away from the planet. Because KOI-868.01 is located in the habitable zone of its star, this exomoon could potentially be an example of a habitable exomoon similar to 2MASS J1119-1137 I.

See also List of exomoon candidates, includes KOI-868.01. 2MASS J1119-1137, another system containing a potentially habitable exomoon.

References

Illustrations

Worked examples

Example 1 — a first encounter with KOI-868.01

Start with the simplest possible case. Write down what KOI-868.01 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 KOI-868.01 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 KOI-868.01 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 KOI-868.01

In research: KOI-868.01 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 KOI-868.01 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: KOI-868.01 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cygnus (constellation), Exoplanet candidates, Exoplanets discovered by Planet Hunters, so understanding it makes those chapters shorter.
In everyday life: Look for KOI-868.01 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 KOI-868.01 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what KOI-868.01 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 KOI-868.01 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is KOI-868.01 in simple terms?

Why does KOI-868.01 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 KOI-868.01?

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 KOI-868.01.