Kepler-56 d is a hypothetical exoplanet that has not yet been confirmed. It is a gas giant exoplanet in the habitable zone of a K-type star. It is one of the candidate planets detected through observations of the Kepler spacecraft, which was launched in 2009 to search for exoplanets by detecting transits, or dips in a star’s brightness when a planet passes in front of it. It has a mass of 5.61 Jupiters, takes 2.7 years to complete one orbit around its star, and is 2.16 AU away from it. It was discovered in 2016 and was announced.
The Kepler-56 system has three known planets, with Kepler-56 d being the outermost planet. The other two planets, Kepler-56 b and Kepler-56 c, are also gas giants and orbit closer to the star.
Kepler-56 d is an exoplanet that orbits the star Kepler-56, which are approximately 2978.5 light-years (913.2 pc) from our Solar System. Its discovery was made public in 2016. Kepler-56 has an apparent magnitude of 13.0 and an absolute magnitude of 3.2. It is 1.3 times more massive and 4.1 times larger than our Sun. The surface temperature is 4912 degrees Celsius, and the spectral type is K3.
Kepler-56 is a star located about 3,000 light-years away from Earth in the constellation Cygnus. It is a yellow subgiant star with a mass and radius larger than that of the Sun. Three planets have been confirmed to orbit Kepler-56, named Kepler-56 b, c, and d in order of their distance from the star. Kepler-56 d is the outermost planet, with an orbital period of 83.6 days and an estimated radius of 2.51 times that of Earth.
Kepler-56 d was discovered using the transit method, which involves observing the dimming of a star’s light as a planet passes in front of it. By measuring periodic dimming, astronomers can determine the planet’s orbital period and size.
However, the existence of Kepler-56 d has not been confirmed, and it is considered a candidate planet because it has not yet been observed transiting the star multiple times, which is required for confirmation. Further observations and analysis will be needed to determine whether Kepler-56 d is a real exoplanet or a false positive signal. In this planetary system, the extrasolar planet Kepler-56 d orbits around the star Kepler-56 every 1002.0 days with its orbital distance of 2.16 AU (323131400.7 km).