Epoch J2000 Equinox J2000
|Right ascension||19h 57m 37.7s|
|Declination||+44° 2′ 6.2″|
|Apparent magnitude (V)||13.9|
Kepler-5 is a star located in the constellation Cygnus in the field of view of the Kepler Mission, a NASA project aimed at detecting planets in transit of, or passing in front of, their host stars as seen from Earth. One closely orbiting, Jupiter-like planet, named Kepler-5b, has been detected around Kepler-5. Kepler-5's planet was one of the first five planets to be discovered by the Kepler spacecraft; its discovery was announced on January 4, 2010 at the 215th meeting of the American Astronomical Society after being verified by a variety of observatories. Kepler-5 is larger and more massive than the Sun, but has a similar metallicity, a major factor in planet formation.
Nomenclature and history
Kepler-5 is named so because it was the fifth planet-bearing star discovered during the course of the Kepler Mission, a NASA operation that seeks to discover Earth-like planets that transit, or cross in front of, their host stars with respect to Earth. The star's planet, Kepler-5b, was the second of the first five planets to be discovered by the Kepler spacecraft; the first three planets found by Kepler were used as tests, and had already been discovered. Kepler-5b was presented to the public on January 4, 2010 at the 215th meeting of the American Astronomical Society in Washington, D.C., along with planets around Kepler-4, Kepler-6, Kepler-7, and Kepler-8.
Kepler-5b's initial discovery by Kepler was re-examined by scientists at the W.M. Keck Observatory at Mauna Kea, Hawaii; the McDonald Observatory in west Texas; the Palomar and Lick Observatories in California; the MMT, WIYN, and Whipple Observatories in Arizona; and the Roque de los Muchachos Observatory in the Canary Islands.
Kepler-5 is a sunlike star that is 1.374 (± 0.056) Msun and 1.793 (± 0.053) Rsun, and is 137% the mass of and 179% the radius of the Sun. The star has a metallicity of [Fe/H] 0.04 (± 0.06), making it approximately as metal-rich as the Sun, therefore increasing the star's likelihood to have planets in orbit. Kepler-5 has an effective temperature of 6297 (± 60) K, which is hotter than the Sun's effective temperature of 5778 K. Kepler-5 has an apparent magnitude of 13.4, and cannot be seen with the naked eye.
Kepler-5b is 2.114 MJ and 1.431 RJ. It is, thus, more than twice the mass of Jupiter, and slightly less than three halves of Jupiter's radius. Kepler-5b orbits its star every 3.5485 days, lying at approximately .05064 AU from Kepler-5. It is, thus, a Hot Jupiter, or a gas giant that orbits near to its host star. To compare, Mercury orbits the sun at .3871 AU every 87.97 days. The planet's eccentricity is assumed to be 0, which is the eccentricity for a circular orbit.
(in order from star)
|b||2.114 MJ||0.05064||3.5485||0||—||1.431 RJ|
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