Kepler-27#Planetary system
{{short description|G-type star in the constellation Cygnus}}
{{Starbox begin}}
{{Starbox observe
| epoch = J2000
| constell = Cygnus
| dec = {{DEC|+41|05|09.1405}}
| appmag_v = 15.855{{citation
| title=Kepler-27b
| publisher=NASA Ames Research Center
| url=http://kepler.nasa.gov/Mission/discoveries/kepler30b/
| archive-url=https://web.archive.org/web/20120503111252/http://kepler.nasa.gov/Mission/discoveries/kepler30b/
| url-status=dead
| archive-date=2012-05-03
| access-date=2011-12-06 }}
}}
{{Starbox character
| class = G5{{citation
|first1=Jean
|last1=Schneider
|title=Star: Kepler-27
|url=http://exoplanet.eu/star.php?st=Kepler-27
|access-date=2011-12-06
|url-status=dead
|archive-url=https://web.archive.org/web/20120426071816/http://exoplanet.eu/star.php?st=Kepler-27
|encyclopedia=Extrasolar Planets Encyclopaedia
|archive-date=2012-04-26
}}
| appmag_1_passband =
| appmag_1 =
| appmag_2_passband =
| appmag_2 =
| appmag_3_passband =
| appmag_3 =
| appmag_4_passband =
| appmag_4 =
| appmag_5_passband =
| appmag_5 =
| r-i =
| v-r =
| b-v =
| u-b =
| variable =
}}
{{Starbox astrometry
| radial_v =
| prop_mo_ra = {{val|2.171|0.033}}
| prop_mo_dec = {{val|-0.324|0.031}}
| parallax = 0.9298
| p_error = 0.0281
| absmag_v =
}}
{{Starbox detail
| luminosity =
| temperature = 5,249{{±|68|56}}
| metal_fe = 0.250{{±|0.064|0.061}}
| radius = 0.850{{±|0.017|0.016}}
| rotational_velocity = 0.6{{±|5.0}}
| age_gyr = 1.620{{+-|0.978|0.466}}
}}
{{Starbox catalog
| names = KOI-841, KIC 5792202, 2MASS J19285682+4105091, Gaia DR2 2053586321364864640
}}
{{Starbox reference
| Simbad = Kepler-27
| KIC = 5792202
}}
{{Starbox end}}
Kepler-27 is a star in the northern constellation of Cygnus, the swan. It is located at the celestial coordinates: Right Ascension {{RA|19|28|56.81962}}, Declination {{DEC|+41|05|09.1405}}. With an apparent visual magnitude of 15.855, this star is too faint to be seen with the naked eye. In 2024, Kepler-27 was discovered to be a binary star with a red dwarf companion 1.975 arcseconds away.{{cite journal|last1=Sullivan|first1=Kendall|last2=Kraus|first2=Adam L.|last3=Berger|first3=Travis A.|last4=Dupuy|first4=Trent J.|display-authors=3|title=Revising Properties of Planet–Host Binary Systems. IV. The Radius Distribution of Small Planets in Binary Star Systems Is Dependent on Stellar Separation|year=2024|journal=The Astronomical Journal|volume=168|issue=3|id=129|page=14|doi=10.3847/1538-3881/ad6310|doi-access=free |bibcode=2024AJ....168..129S|arxiv=2406.17648}}
Planetary system
The planetary system of Kepler-27 comprising two small gas giants on eccentric orbits was discovered in late 2011. The planets Kepler-27b and Kepler-27c have equilibrium temperatures of 610 K and 481 K, respectively. In 2021, a third, sub-Neptune-sized planet was confirmed, orbiting closer in than the other two planets.
{{OrbitboxPlanet begin
}}
{{OrbitboxPlanet
| exoplanet = d
| mass =
| semimajor =
| period = 6.54629
| radius = 0.2414
}}
{{OrbitboxPlanet
| exoplanet = b
| mass = 0.1320{{±|0.018}}
| semimajor = 0.118
| period = 15.3348
| radius = 0.522{{±|0.024}}
}}
{{OrbitboxPlanet
| exoplanet = c
| mass = 0.0670{{±|0.011}}
| semimajor = 0.191
| period = 31.3309
| radius = 0.640{{±|0.029}}
}}
{{Orbitbox end}}
References
{{reflist|refs=
{{Cite Gaia DR3|2053586321364864640}}
{{cite web |title=Kepler-27 |url=https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-27 |website=NASA Exoplanet Archive |accessdate=7 November 2022}}
{{Cite constellation|Kepler-27}}
{{cite journal |last1=Valizadegan |first1=Hamed |last2=Martinho |first2=Miguel J. S. |date=February 2022 |title=ExoMiner: A Highly Accurate and Explainable Deep Learning Classifier That Validates 301 New Exoplanets |journal=The Astrophysical Journal |volume=926 |issue=2 |pages=120 |doi=10.3847/1538-4357/ac4399 |arxiv=2111.10009 |bibcode=2022ApJ...926..120V|s2cid=244954905 |doi-access=free }}
}}
{{Sky|19|28|56.825|+|41|05|09.15}}
{{Stars of Cygnus}}
Category:Cygnus (constellation)
Category:G-type main-sequence stars
Category:Planetary transit variables