Kepler-7 received its name because it was the home to the seventh planetary system discovered by the NASA-led Kepler Mission, a project aimed at detecting terrestrial planets that transit, or pass in front of, their host stars as seen from Earth. The planet orbiting Kepler-7 was the fourth planet to be discovered by the Kepler spacecraft; the first three planets combed from Kepler's data had been previously discovered, and were used to verify the accuracy of Kepler's measurements. Kepler-7b was announced to the public on January 4, 2010 at the 215th meeting of the American Astronomical Society in Washington, D.C. along with Kepler-4b, Kepler-5b, Kepler-6b, and Kepler-8b. Kepler-7b was noted for its unusually and extremely low density. The planet's initial discovery by Kepler was verified by additional observations made at observatories in Hawaii, Texas, Arizona, California, and the Canary Islands.
Characteristics
Kepler-7 is a sunlike star that is 1.347 Msun and 1.843 Rsun. This means that the star is about 35% more massive and 84% wider than the Sun. The star is estimated to be 3.5 billion years old. It is also estimated to have a metallicity of = 0.11, meaning that Kepler-7 is approximately 30% more metal-rich than the Sun; metallicity plays a significant role in the formation of planetary systems, as metal-rich stars tend to be more likely to have planets in orbit. The star's effective temperature is 5933 K. In comparison, the 4.6 billion-year-old Sun releases less heat, with an effective temperature of 5778 K. The star has an apparent magnitude of 13, meaning that it is extremely dim as seen from Earth. It cannot be seen with the naked eye. It is estimated to lie at approximately 3090 light years from the Solar System. There is a star that is 4 magnitudes dimmer located 1.90 arcseconds away, whether this a gravitationally boundcompanion star or a chance optical alignment is unknown.
Planetary system
is the only planet that has been discovered in Kepler-7's orbit. It is.433 MJ and 1.478 RJ, meaning it is 43% the mass of planet Jupiter, but is nearly three halves its size. With a density of.166 grams/cc, the planet is approximately 17% the density of water. This is comparable to styrofoam. At a distance of.06224 AU from its host star, Kepler-7b completes an orbit around Kepler-7 every 4.8855 days. Planet Mercury, however, orbits the Sun at.3871 AU, and takes approximately 87.97 days to complete one orbit. Kepler-7b's eccentricity is assumed to be 0, which would give Kepler-7b a circular orbit by definition.
