| 词条 | Kepler-28b |
| 释义 |
| name = Kepler-28b | discoverer = Jason Steffen et al. | discovery_site = Kepler Space Observatory | discovered = 25 January 2012 | discovery_method = Transit | apsis = astron | semimajor = {{convert|0.05375|AU|km|abbr=on}}[1] | period = 5.91227[1] d | star = Kepler-28 | mean_radius = {{val|2.41|+0.04|-0.17}}[1] {{Earth radius|link=y}} }} 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 starKepler-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.[5] CharacteristicsKepler-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.[5] The ratio of its orbital period with that of Kepler-28c is 1.52.[8] References1. ^1 2 {{cite web|url=http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-28+b|title=Kepler-28 b|work=NASA Exoplanet Archive|accessdate=23 January 2017}} [2][3]2. ^1 2 {{cite web |url=http://kepler.nasa.gov/Mission/discoveries/ |title=Kepler Table of Discoveries |author= |date=2012 |work=Kepler Mission |publisher=Ames Research Center, NASA |accessdate=22 June 2012}} 3. ^1 {{cite journal |last1=Steffen |first1=J. |last2=Fabrycky |first2=D. |date=2012 |title=Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations |journal= Monthly Notices of the Royal Astronomical Society|volume= 421|issue= |pages= 2342 |publisher= |doi= 10.1111/j.1365-2966.2012.20467.x |arxiv=1201.5412v1|bibcode = 2012MNRAS.421.2342S |url=https://dash.harvard.edu/bitstream/handle/1/29990199/1201.5412.pdf?sequence=1}} }}{{Extrasolar-planet-stub}} 2 : Giant planets|Exoplanets discovered by Kepler (spacecraft) |
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