Kepler-26#Planetary system
{{Short description|Star in the constellation Lyra}}
{{Starbox begin}}
{{Starbox image
| image = File:Kepler-26 system (1).png
| caption = The Kepler-26 system, with the circumstellar habitable zone in green.
}}
{{Starbox observe
| epoch = J2000
| constell = Lyra
| appmag_v = 15.473{{citation
| title=Kepler-26b
| publisher=NASA Ames Research Center
| url=http://kepler.nasa.gov/Mission/discoveries/kepler25b/
| archive-url=https://web.archive.org/web/20120503221725/http://kepler.nasa.gov/Mission/discoveries/kepler25b/
| url-status=dead
| archive-date=2012-05-03
| access-date=2011-12-06 }}
}}
{{Starbox character
| class = M0V{{citation
|first1=Jean
|last1=Schneider
|title=Star: Kepler-26
|url=http://exoplanet.eu/star.php?st=Kepler-26
|access-date=2013-12-18
|url-status=dead
|archive-url=https://web.archive.org/web/20120505101850/http://exoplanet.eu/star.php?st=Kepler-26
|encyclopedia=Extrasolar Planets Encyclopaedia
|archive-date=2012-05-05
}}
| 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|9.462|(27)}}
| prop_mo_dec = {{val|−13.942|(26)}}
| parallax = 2.9378
| p_error = 0.0211
| absmag_v =
}}
{{Starbox detail
| habitable zone = {{nowrap|}}
| temperature = {{nowrap|4500}}
| rotation = {{val|17.918|0.005|s= days}}
| rotational_velocity = {{nowrap|1.9}}
| age =
}}
{{Starbox catalog
| names = KOI-250, KIC 9757613, 2MASS J18594583+4633595, Gaia DR2 2107317358665730688
}}
{{Starbox reference
| Simbad = Kepler-26
| KIC = 9757613
}}
{{Starbox end}}
Kepler-26 is a star in the northern constellation of Lyra. It is located at the celestial coordinates:
Right Ascension {{RA|18|59|45.8408}} Declination {{Dec|+46|33|59.438}}. With an apparent visual magnitude of 15.5, this star is too faint to be seen with the naked eye.
Planetary system
The two planets, Kepler-26b and Kepler-26c, were discovered by transit method in late 2011,{{citation|arxiv=1201.5412|title=Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations|year=2012|doi=10.1111/j.1365-2966.2012.20467.x|last1=Steffen|first1=Jason H.|last2=Fabrycky|first2=Daniel C.|last3=Ford|first3=Eric B.|last4=Carter|first4=Joshua A.|last5=Desert|first5=Jean-Michel|last6=Fressin|first6=Francois|last7=Holman|first7=Matthew J.|last8=Lissauer|first8=Jack J.|last9=Moorhead|first9=Althea V.|last10=Rowe|first10=Jason F.|last11=Ragozzine|first11=Darin|last12=Welsh|first12=William F.|last13=Batalha|first13=Natalie M.|last14=Borucki|first14=William J.|last15=Buchhave|first15=Lars A.|last16=Bryson|first16=Steve|last17=Caldwell|first17=Douglas A.|last18=Charbonneau|first18=David|last19=Ciardi|first19=David R.|last20=Cochran|first20=William D.|last21=Endl|first21=Michael|last22=Everett|first22=Mark E.|last23=Gautier III|first23=Thomas N.|last24=Gilliland|first24=Ron L.|last25=Girouard|first25=Forrest R.|last26=Jenkins|first26=Jon M.|last27=Horch|first27=Elliott|last28=Howell|first28=Steve B.|last29=Isaacson|first29=Howard|last30=Klaus|first30=Todd C.|journal=Monthly Notices of the Royal Astronomical Society |volume=421 |issue=3 |page=2342 |doi-access=free |bibcode=2012MNRAS.421.2342S |s2cid=11898578|display-authors=29}} and classified as small (sub-Neptune) gas giants in 2016. In 2012, the planetary candidate Kepler-26d was also detected, and confirmed in 2014.{{cite journal|arxiv=1402.6534|doi=10.1088/0004-637X/784/1/45|title=Validation Ofkepler's Multiple Planet Candidates. III. Light Curve Analysis and Announcement of Hundreds of New Multi-Planet Systems|year=2014|last1=Rowe|first1=Jason F.|last2=Bryson|first2=Stephen T.|last3=Marcy|first3=Geoffrey W.|last4=Lissauer|first4=Jack J.|last5=Jontof-Hutter|first5=Daniel|last6=Mullally|first6=Fergal|last7=Gilliland|first7=Ronald L.|last8=Issacson|first8=Howard|last9=Ford|first9=Eric|last10=Howell|first10=Steve B.|last11=Borucki|first11=William J.|last12=Haas|first12=Michael|last13=Huber|first13=Daniel|last14=Steffen|first14=Jason H.|last15=Thompson|first15=Susan E.|last16=Quintana|first16=Elisa|last17=Barclay|first17=Thomas|last18=Still|first18=Martin|last19=Fortney|first19=Jonathan|last20=Gautier|first20=T. N.|last21=Hunter|first21=Roger|last22=Caldwell|first22=Douglas A.|last23=Ciardi|first23=David R.|last24=Devore|first24=Edna|last25=Cochran|first25=William|last26=Jenkins|first26=Jon|last27=Agol|first27=Eric|last28=Carter|first28=Joshua A.|last29=Geary|first29=John|journal=The Astrophysical Journal|volume=784|issue=1|page=45|bibcode=2014ApJ...784...45R|s2cid=119118620}} The planet Kepler-26e was discovered on a much wider orbit in 2014.[https://exoplanet.eu/catalog/kepler_26_e--2216/ Planet Kepler-26 e on exoplanet.eu]
{{OrbitboxPlanet begin
| table_ref = {{citation|arxiv=1611.09236|title=An overabundance of low-density Neptune-like planets|year=2016|doi=10.1093/mnras/stw3103|last1=Cubillos|first1=Patricio|last2=Erkaev|first2=Nikolai V.|last3=Juvan|first3=Ines|last4=Fossati|first4=Luca|last5=Johnstone|first5=Colin P.|last6=Lammer|first6=Helmut|last7=Lendl|first7=Monika|last8=Odert|first8=Petra|last9=Kislyakova|first9=Kristina G.|journal=Monthly Notices of the Royal Astronomical Society|volume=466|issue=2|pages=1868–1879|doi-access=free |s2cid=119408956}}{{citation|arxiv=1512.02003|title=Secure TTV Mass Measurements: Ten Kepler Exoplanets between 3 and 8 M🜨 with Diverse Densities and Incident Fluxes|year=2015|doi=10.3847/0004-637X/820/1/39|last1=Jontof-Hutter|first1=Daniel|last2=Ford|first2=Eric B.|last3=Rowe|first3=Jason F.|last4=Lissauer|first4=Jack J.|last5=Fabrycky|first5=Daniel C.|author6=Christa Van Laerhoven|last7=Agol|first7=Eric|last8=Deck|first8=Katherine M.|last9=Holczer|first9=Tomer|last10=Mazeh|first10=Tsevi|s2cid=11322397 |doi-access=free }}
}}
{{OrbitboxPlanet
| exoplanet = d
| mass_earth =
| semimajor = 0.039
| period = 3.543919
| radius_earth = 1.2
}}
{{OrbitboxPlanet
| exoplanet = b
| mass_earth = 5.1{{±|0.7}}
| semimajor = 0.085
| period = 12.2829
| radius_earth = 2.78{{±|0.11}}
}}
{{OrbitboxPlanet
| exoplanet = c
| mass_earth = 6.2{{±|0.7}}
| semimajor = 0.107
| period = 17.2513
| radius_earth = 2.72{{±|0.12}}
}}
{{OrbitboxPlanet
| exoplanet = e
| mass =
| semimajor = 0.22
| period = 46.827915
| radius_earth = 2.1
}}
{{Orbitbox end}}
References
{{reflist|refs=
{{Cite Gaia DR3|2107317358665730688}}
{{Cite constellation|Kepler-26}}
}}
{{Sky|18|59|45.839|+|46|33|59.54}}
{{Stars of Lyra}}
Category:M-type main-sequence stars
Category:Planetary transit variables