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Kepler-47c
Kepler-47c (also known as Kepler-47(AB)-c and by its Kepler Object of Interest designation KOI-3154.02) is an exoplanet orbiting the binary star system Kepler-47, the outermost of three such planets discovered by NASA's Kepler spacecraft. The system, also involving two other exoplanets, is located about 3,400 light-years (1,060 parsecs) away.
Kepler-47c is a gas giant, an exoplanet that is near the same mass and radius as the planets Uranus and Neptune. It has a temperature of 245 K (−28 °C; −19 °F). The planet has a radius of 4.62 R🜨 and has no solid surface. It has a mass of around 3.2 M🜨. It orbits within the habitable zone of its system, and could have a dense atmosphere of water vapor.[citation needed]
The planet orbits in a circumbinary orbit around a (G-type) and (M-type) binary star system. The stars orbit each other about every 7.45 days. The stars have masses of 1.04 M☉ and 0.35 M☉ and radii of 0.96 R☉ and 0.35 R☉, respectively. They have temperatures of 5636 K and 3357 K. Based on the stellar characteristics, an estimated age of 4–5 billion years for the system is possible. In comparison, the Sun is about 4.6 billion years old and has a temperature of 5778 K. The primary star is somewhat metal-poor, with a metallicity ([Fe/H]) of −0.25, or 56% of the solar amount. The stars' luminosities (L☉) are 84% and 1% that of the Sun.
The apparent magnitude of the system, or how bright it appears from Earth's perspective, is about 15.8. Therefore, it is too dim to be seen with the naked eye.
Kepler-47c orbits around its parent stars every 303 days at a distance of 0.99 AU from its stars (nearly the same distance that Earth orbits from the Sun, which is about 1 AU). The planet receives about 87.3% of the amount of sunlight that Earth does. Unlike majority of circumbinary planets, Kepler-47c does not seem to have undergone a significant migration since its formation.
Kepler-47c resides in the circumbinary habitable zone of the parent stars. The exoplanet, with a radius of 4.63 R🜨, is too large to likely be rocky, and because of this the planet itself may not be habitable. Hypothetically, large enough moons, with a sufficient atmosphere and pressure, may be able to support liquid water and potentially life.
For a stable orbit the ratio between the moon's orbital period Ps around its primary and that of the primary around its star Pp must be < 1/9, e.g. if a planet takes 90 days to orbit its star, the maximum stable orbit for a moon of that planet is less than 10 days. Simulations suggest that a moon with an orbital period less than about 45 to 60 days will remain safely bound to a massive giant planet or brown dwarf that orbits 1 AU from a Sun-like star. In the case of Kepler-47c, this would be practically the same to have a stable orbit.
Tidal effects could also allow the moon to sustain plate tectonics, which would cause volcanic activity to regulate the moon's temperature and create a geodynamo effect which would give the satellite a strong magnetic field.
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Kepler-47c AI simulator
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Kepler-47c
Kepler-47c (also known as Kepler-47(AB)-c and by its Kepler Object of Interest designation KOI-3154.02) is an exoplanet orbiting the binary star system Kepler-47, the outermost of three such planets discovered by NASA's Kepler spacecraft. The system, also involving two other exoplanets, is located about 3,400 light-years (1,060 parsecs) away.
Kepler-47c is a gas giant, an exoplanet that is near the same mass and radius as the planets Uranus and Neptune. It has a temperature of 245 K (−28 °C; −19 °F). The planet has a radius of 4.62 R🜨 and has no solid surface. It has a mass of around 3.2 M🜨. It orbits within the habitable zone of its system, and could have a dense atmosphere of water vapor.[citation needed]
The planet orbits in a circumbinary orbit around a (G-type) and (M-type) binary star system. The stars orbit each other about every 7.45 days. The stars have masses of 1.04 M☉ and 0.35 M☉ and radii of 0.96 R☉ and 0.35 R☉, respectively. They have temperatures of 5636 K and 3357 K. Based on the stellar characteristics, an estimated age of 4–5 billion years for the system is possible. In comparison, the Sun is about 4.6 billion years old and has a temperature of 5778 K. The primary star is somewhat metal-poor, with a metallicity ([Fe/H]) of −0.25, or 56% of the solar amount. The stars' luminosities (L☉) are 84% and 1% that of the Sun.
The apparent magnitude of the system, or how bright it appears from Earth's perspective, is about 15.8. Therefore, it is too dim to be seen with the naked eye.
Kepler-47c orbits around its parent stars every 303 days at a distance of 0.99 AU from its stars (nearly the same distance that Earth orbits from the Sun, which is about 1 AU). The planet receives about 87.3% of the amount of sunlight that Earth does. Unlike majority of circumbinary planets, Kepler-47c does not seem to have undergone a significant migration since its formation.
Kepler-47c resides in the circumbinary habitable zone of the parent stars. The exoplanet, with a radius of 4.63 R🜨, is too large to likely be rocky, and because of this the planet itself may not be habitable. Hypothetically, large enough moons, with a sufficient atmosphere and pressure, may be able to support liquid water and potentially life.
For a stable orbit the ratio between the moon's orbital period Ps around its primary and that of the primary around its star Pp must be < 1/9, e.g. if a planet takes 90 days to orbit its star, the maximum stable orbit for a moon of that planet is less than 10 days. Simulations suggest that a moon with an orbital period less than about 45 to 60 days will remain safely bound to a massive giant planet or brown dwarf that orbits 1 AU from a Sun-like star. In the case of Kepler-47c, this would be practically the same to have a stable orbit.
Tidal effects could also allow the moon to sustain plate tectonics, which would cause volcanic activity to regulate the moon's temperature and create a geodynamo effect which would give the satellite a strong magnetic field.