Kepler-28b
| Discovery | |
|---|---|
| Discovered by | Jason Steffen et al. |
| Discovery site | Kepler Space Observatory |
| Discovery date | 25 January 2012 |
| Transit | |
| Orbital characteristics | |
| 0.05375 AU (8,041,000 km)[1] | |
| 5.91227[1] d | |
| Star | Kepler-28 |
| Physical characteristics | |
| 2.41+0.04 −0.17[1] R🜨 | |
Kepler-28b is an extrasolar planet orbiting the star Kepler-28. It is a transiting planet that is smaller than Jupiter that orbits very closely to Kepler-28.
Host star
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.[2] 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.[3]
Characteristics
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.[2] The planet, which transits its host star, completely passes across the face of Kepler-28 in 2.77 hours.[3] The ratio of its orbital period with that of Kepler-28c is 1.52.[4]
References
- ^ a b c "Kepler-28 b". NASA Exoplanet Archive. Retrieved 23 January 2017.
- ^ a b "Star: Kepler-28". Extrasolar Planets Encyclopaedia. 2012. Archived from the original on 26 April 2012. Retrieved 22 June 2012.
- ^ a b "Kepler Table of Discoveries". Kepler Mission. Ames Research Center, NASA. 2012. Retrieved 22 June 2012.
- ^ Steffen, J.; Fabrycky, D. (2012). "Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations" (PDF). Monthly Notices of the Royal Astronomical Society. 421: 2342. arXiv:1201.5412v1. Bibcode:2012MNRAS.421.2342S. doi:10.1111/j.1365-2966.2012.20467.x.
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