Kepler-28 is the host star of Kepler-28b, and is alternatively known as KOI-870 and KIC 6949607. The star is smaller, less massive, and cooler than the Sun, with (respectively) a radius 0.7 times of the Sun; a mass 0.75 times of the Sun; and an effective temperature of 4590 K. The star has a high metallicity with relation to the Sun, as it has a metallicity of [M/H] = 0.34. With an apparent magnitude of 15.05, Kepler-28 is effectively invisible to the naked eye from Earth.
Kepler-28b is a gas giant that, at its maximum could be 1.51 times the mass of Jupiter. However, at 0.32 Jupiter radii, Kepler-28b is far smaller than Jupiter. The planet orbits at a distance of 0.062 AU, which corresponds roughly to 6% of the average distance that separates the Sun and Earth, and completes each orbit every 5.9123 days. The planet, which transits its host star, completely passes across the face of Kepler-28 in 2.77 hours. The ratio of its orbital period with that of Kepler-28c is 1.52.
- ↑ 1.0 1.1 Star: Kepler-28. Extrasolar Planets Encyclopaedia (2012). Retrieved 22 June 2012.
- ↑ 2.0 2.1 Kepler Table of Discoveries. Kepler Mission. Ames Research Center, NASA (2012). Retrieved 22 June 2012.
- ↑ (2012). Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations. Astrophysical Journal: 1–15.
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