Kepler-7
{{Short description|G-type star located in the constellation Lyra}}
{{good article}}
{{Starbox begin}}
{{Starbox image
|image=300px
|caption=Kepler-7-Sun comparison
|width=250
|lat=61.25|long=37.25
|mark=Cercle rouge 100%.svg | marksize=17
|float=center
}}
{{Starbox observe
| epoch = J2000
| constell = Lyra
| appmag_v = {{val|13.005|0.039}}
}}
{{Starbox character
| appmag_1_passband = J
| appmag_1 = {{val|11.833|0.020}}
| appmag_2_passband = H
| appmag_2 = {{val|11.601|0.022}}
| appmag_3_passband = K
| appmag_3 = {{val|11.535|0.020}}
| appmag_4_passband = B
| appmag_4 = {{val|13.620|0.029}}
}}
{{Starbox astrometry
| prop_mo_ra = {{val|−2.937|(15)}}
| prop_mo_dec = {{val|−21.084|(14)}}
| parallax = 1.0319
| p_error = 0.0121
}}
{{Starbox detail
| mass = {{val|1.347|+0.072|-0.054}}
| radius = {{val|1.843|+0.048|-0.066}}
| luminosity = {{val|4.15|+0.63|-0.54}}
| age_gyr = 3.3 ± 0.4
| gravity = 3.98 ± 0.10
| metal_fe = +0.11 ± 0.03
| temperature = 5933 ± 44
| rotational_velocity = 4.2 ± 0.5
}}
{{Starbox catalog
| names = {{odlist | 2MASS=J19141956+4105233 | KIC=5780885 | KOI=97 | WDS=J19143+4105AB }}
}}
{{Starbox reference
| Simbad = Kepler-7
}}
{{Starbox end}}
Kepler-7 is a star located in the constellation Lyra in the field of view of the Kepler Mission, a NASA operation in search of Earth-like planets. It is home to the fourth of the first five planets that Kepler discovered; this planet, a Jupiter-size gas giant named Kepler-7b, is as light as styrofoam. The star itself is more massive than the Sun, and is nearly twice the Sun's radius. It is also slightly metal-rich, a major factor in the formation of planetary systems. Kepler-7's planet was presented on January 4, 2010 at a meeting of the American Astronomical Society.
Nomenclature and discovery
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 (± 1) billion years old. It is also estimated to have a metallicity of [Fe/H] = 0.11 (± 0.03), 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.{{cite web |url=http://www.spacedaily.com/news/extrasolar-04zl.html |title=Extrasolar Planets: A Matter of Metallicity |author=Henry Bortman |date=12 October 2004 |publisher=Space Daily |access-date=27 February 2011}} The star's effective temperature is 5933 (± 44) K.{{cite web|url=http://exoplanet.eu/star.php?st=Kepler-7 |title=Notes for star Kepler-7 |date=2010 |access-date=27 February 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110121150542/http://exoplanet.eu/star.php?st=Kepler-7 |work=Extrasolar Planets Encyclopaedia |archive-date=21 January 2011 }} In comparison, the 4.6 billion-year-old Sun{{cite news |url=http://www.universetoday.com/18237/how-old-is-the-sun/ |title=How Old is the Sun? |author=Fraser Cain |date=16 September 2008 |work=Universe Today |access-date=27 February 2011}} releases less heat, with an effective temperature of 5778 K.{{cite web |url=http://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html |title=Sun Fact Sheet |author=David Williams |date=1 September 2004 |work=Goddard Space Flight Center |publisher=NASA |access-date=27 February 2011}}
File:Kepler first five exoplanet size.jpg
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 3160 light years from the Solar System.
There is a star that is 4 magnitudes dimmer located 1.90 arcseconds away, whether this a gravitationally bound companion star or a chance optical alignment is unknown.
Planetary system
File:Exoplanet Comparison Kepler-7 b.png compared to Jupiter. The rendering of the planet is represented by observations of the planet's upper atmosphere by the Spitzer Space Telescope.]]
Kepler-7b 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.{{cite web |url=http://cs.astronomy.com/asycs/blogs/astronomy/archive/2010/01/05/215th-aas-meeting-update-kepler-discoveries-the-talk-of-the-town.aspx |title=215th AAS meeting update: Kepler discoveries the talk of the town |author=Rich Talcott |date=5 January 2010 |work=Astronomy.com |publisher=Astronomy magazine |access-date=27 February 2011 |archive-date=18 July 2011 |archive-url=https://web.archive.org/web/20110718093334/http://cs.astronomy.com/asycs/blogs/astronomy/archive/2010/01/05/215th-aas-meeting-update-kepler-discoveries-the-talk-of-the-town.aspx |url-status=dead }} 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.{{cite web |url=http://nssdc.gsfc.nasa.gov/planetary/factsheet/mercuryfact.html |title=Mercury Fact Sheet |author=David Williams |date=17 November 2010 |work=Goddard Space Flight Center |publisher=NASA |access-date=27 February 2011}} Kepler-7b's eccentricity is assumed to be 0, which would give Kepler-7b a circular orbit by definition.
{{OrbitboxPlanet begin
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = 0.433
| period = 4.8855
| semimajor = 0.06224
| eccentricity = 0
| radius = 1.478
}}
{{Orbitbox end}}
See also
References
External links
{{cite web|last=Boyle|first=Alan|title=How astronomers mapped the patchy clouds of an alien world|date=30 September 2013 |url=http://www.nbcnews.com/science/how-astronomers-mapped-patchy-clouds-alien-world-8C11300069|publisher=NBC News|access-date=3 October 2013}}
{{Sky|19|14|19.6|+|41|5|23.3}}
{{Stars of Lyra}}
Category:Planetary systems with one confirmed planet