Kepler-28b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | Kepler-28 | |
| Constellation | Cygnus | |
| Right ascension | (α) | 19h 28m 32.8905s[1] |
| Declination | (δ) | +42° 25′ 45.959″[1] |
| Apparent magnitude | (mV) | 15.5 |
| Distance | 1450±20[1] ly (444±5[1] pc) | |
| Spectral type | M0V[2] | |
| Mass | (m) | 0.75[2] M☉ |
| Radius | (r) | 0.70[2] R☉ |
| Temperature | (T) | 4590[2] K |
| Physical characteristics | ||
| Radius | (r) | 2.41+0.04 −0.17[2] R⊕ |
| Orbital elements | ||
| Semi-major axis | (a) | 0.05375[2] AU |
| Orbital period | (P) | 5.91227[2] d |
| Discovery information | ||
| Discovery date | 25 January 2012 | |
| Discoverer(s) | Jason Steffen et al. | |
| Discovery method | Transit | |
| Discovery site | Kepler Space Observatory | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
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.[3] 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.[4]
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.[3] The planet, which transits its host star, completely passes across the face of Kepler-28 in 2.77 hours.[4] The ratio of its orbital period with that of Kepler-28c is 1.52.[5]
References
- 1 2 3 4 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia Data Release 2 Vizier catalog entry
- 1 2 3 4 5 6 7 "Kepler-28 b". NASA Exoplanet Archive. Retrieved 23 January 2017.
- 1 2 "Star: Kepler-28". Extrasolar Planets Encyclopaedia. 2012. Archived from the original on 26 April 2012. Retrieved 22 June 2012.
- 1 2 "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". 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.