K and is 7 billion years old. In comparison, the Sun is about 4. K. 9The star is somewhat poor in metals, with a metallicity FeH of about 0. Sun. 2 The stars luminosity is typical for a star like Kepler 6. The stars apparent magnitude, or how bright it appears from Earths perspective, is 1. Therefore, it is too dim to be seen with the naked eye. Planetary systemeditThe Kepler 6. Companionin order from starMass. Semimajor axisAUOrbital perioddaysEccentricity. Inclination. Radiusb. M0. 0. 55. 3 0. Rc. M0. 0. 93 0. 0. Rd. M0. 1. 20 0. 0. Re. M0. 4. 27 0. 0. Rf. M0. 7. 18 0. 0. RAll known planets transit the star this means that all five planets orbits appear to cross in front of their star as viewed from the Earths perspective. Their inclinations relative to Earths line of sight, or how far above or below the plane of sight they are, vary by less than one degree. This allows direct measurements of the planets periods and relative diameters compared to the host star by monitoring each planets transit of the star. The radii of the planets fall between 0. Earth radii. Of particular interest are the planets e and f, as they are the best candidates for solid planets falling into the habitable zone of their star. Their radii, 1. 6. Earth radii respectively, put them in a radius range where they may be solid terrestrial planets. Their positions within the Kepler 6. Kepler 6. 2s habitable zone the distance range where, for a given chemical composition significant amounts of carbon dioxide for Kepler 6. Kepler 6. 2e, these two planets could have liquid water on their surfaces,2 perhaps completely covering them. The masses of the planets could not be directly determined using either the radial velocity or the transit timing method this failure leads to weak upper limits for the planets masses. For e and f, that upper limit amounts to 3. Earth masses, respectively the real masses are expected to be significantly lower. Based on composition models, the real masses of the planets are probably likely to be 2. M, respectively, taking into the uncertainty in composition and upper mass limits. The existence of an additional planet at a distance of 0. AU, between Kepler 6. Kepler 6. 2f of the Kepler 6. GalleryeditArtists impressions of the Kepler 6. Solar System with their respective habitable zones. Kepler 6. 2f foreground and Kepler 6. Kepler 6. 2 center. Comparison of the sizes of planets Kepler 6. Kepler 6. 2e, Kepler 6. Earth. Exoplanets are artists impressions. See alsoeditReferencesedit abcdKepler Input Catalog search result. Space Telescope Science Institute. Retrieved 1. 8 April 2. Borucki, William J. April 2. 01. 3. Kepler 6. A Five Planet System with Planets of 1. Earth Radii in the Habitable Zone. Science Express. 3. Xiv 1. 30. 4. 7. Bibcode 2. Sci. B. doi 1. 0. PMID 2. 35. 99. 26. Retrieved 1. 8 April 2. Rybka, S. P. et al. GPM compiled catalogue of absolute proper motions of stars in selected areas of sky with galaxies. Bibcode 1. 99. 7KFNT. R. Johnson, Michele Harrington, J. D. 1. 8 April 2. NASAs Kepler Discovers Its Smallest Habitable Zone Planets to Date. NASA. Retrieved 1. April 2. 01. 3. Morton, Timothy Johnson, John 2. August 2. 01. 1. On the Low False Positive Probabilities of Kepler Planet Candidates. The Astrophysical Journal. Xiv 1. 10. 1. 5. Bibcode 2. Ap. J. 7. 38. 1. 70. M. doi 1. 0. 1. 08. X7. 3821. 70. Retrieved 2 March 2. NASA 2. 7 January 2. Kepler Discoveries Summary Table. NASA. Retrieved 1 March 2. Hessman, F. V. Dhillon, V. S. Winget, D. E. Schreiber, M. R. Horne, K. Marsh, T. R. Guenther, E. Schwope, A. Heber, U. On the naming convention used for multiple star systems and extrasolar planets. Xiv 1. 01. 2. 0. SR. Fraser Cain 1. September 2. How Old is the Sun. Universe Today. Retrieved 1. February 2. 01. 1. Fraser Cain 1. September 2. Temperature of the Sun. Universe Today. Retrieved 1. February 2. 01. 1. Water worlds surface Planets covered by global ocean with no land in sight. Harvard Gazette. 2. Retrieved 2. 01. 3 0. Kaltenegger, L. Sasselov, D. Rugheimer, S. October 2. Water Planets in the Habitable Zone Atmospheric Chemistry, Observable Features, and the case of Kepler 6. The Astrophysical Journal. L4. 7. ar. Xiv 1. Bibcode 2. 01. 3Ap. J. 7. 75. L. 4. 7K. L4. 7. L4. 7. NASA Kepler Discovers New Potentially Habitable Exoplanets Abel Mendez. April 1. 8, 2. 01. Retrieved August 1. Habitable Exoplanets Catalog, Planetary Habitability Laboratory. Retrieved August 1. Scholkmann F 2. 01. A prediction of an additional planet of the extrasolar planetary system Kepler 6. PDF. Progress in Physics. External linkseditCoordinates 1.