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Coordinates: Sky map 19h 28m 56.825s, +41° 05′ 09.15″
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{{short description|G-type star in the constellation Cygnus}}
{{Starbox begin
{{Starbox begin
| name = Kepler-31
| name = Kepler-27
}}
}}
<!-- {{Starbox image |
<!-- {{Starbox image |
| image =
| image =
| caption = A diagram of the Kepler-31 System, compared to our Inner Solar System.
| caption = A diagram of the Kepler-27 System, compared to our Inner Solar System.
}} -->
}} -->
{{Starbox observe
{{Starbox observe
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| title=The Constellations | publisher=[[International Astronomical Union]]
| title=The Constellations | publisher=[[International Astronomical Union]]
| url=http://www.iau.org/public/constellations/#cyg
| url=http://www.iau.org/public/constellations/#cyg
| accessdate=2011-12-15 }}</ref>
| access-date=2011-12-15 }}</ref>
| ra = {{RA|19|28|56.8195}}<ref name="Gaia DR2"/>
| ra = {{RA|19|28|56.81962}}<ref name="Gaia DR3"/>
| dec = {{DEC|+41|05|09.141}}<ref name="Gaia DR2"/>
| dec = {{DEC|+41|05|09.1405}}<ref name="Gaia DR3"/>
| appmag_v = 15.855<ref name=nasa_ames>{{citation
| appmag_v = 15.855<ref name=nasa_ames>{{citation
| title=Kepler-31b
| title=Kepler-27b
| publisher=[[NASA Ames Research Center]]
| publisher=[[NASA Ames Research Center]]
| url=http://kepler.nasa.gov/Mission/discoveries/kepler30b/
| url=http://kepler.nasa.gov/Mission/discoveries/kepler30b/
| archive-url=https://web.archive.org/web/20120503111252/http://kepler.nasa.gov/Mission/discoveries/kepler30b/
⚫
| accessdate=2011-12-06 }}</ref>
| url-status=dead
| archive-date=2012-05-03
⚫
| access-date=2011-12-06 }}</ref>
}}
}}
{{Starbox character
{{Starbox character
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|first1=Jean
|first1=Jean
|last1=Schneider
|last1=Schneider
|title=Star: Kepler-31
|title=Star: Kepler-27
⚫
|url=http://exoplanet.eu/star.php?st=Kepler-27
⚫
|work=[[Extrasolar Planets Encyclopaedia]]
⚫
|access-date=2011-12-06
|publisher=Paris Observatory
⚫
|url=http://exoplanet.eu/star.php?st=Kepler-31
⚫
|accessdate=2011-12-06
|url-status=dead
|url-status=dead
|archiveurl=https://web.archive.org/web/20120426071816/http://exoplanet.eu/star.php?st=Kepler-31
|archive-url=https://web.archive.org/web/20120426071816/http://exoplanet.eu/star.php?st=Kepler-27
⚫
|encyclopedia=[[Extrasolar Planets Encyclopaedia]]
|archivedate=2012-04-26
|archive-date=2012-04-26
}}</ref><!-- NOTE: Please don't add a 'V' here until it is established as such by a reliable source. -->
}}</ref><!-- NOTE: Please don't add a 'V' here until it is established as such by a reliable source. -->
| appmag_1_passband = <!-- Passband for first apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_1_passband = <!-- Passband for first apparent magnitude (e.g., H, J, K, etc.) -->
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{{Starbox astrometry
{{Starbox astrometry
| radial_v =
| radial_v =
| prop_mo_ra = {{val|2.250|0.065}}<ref name="Gaia DR2"/>
| prop_mo_ra = {{val|2.171|0.033}}
| prop_mo_dec = {{val|−0.326|0.060}}<ref name="Gaia DR2"/>
| prop_mo_dec = {{val|-0.324|0.031}}
| pm_footnote = <ref name="Gaia DR3"/>
| parallax = 0.9301
| parallax = 0.9298
| p_error = 0.0360
| p_error = 0.0281
| parallax_footnote = <ref name="Gaia DR2"/>
| parallax_footnote = <ref name="Gaia DR3"/>
| absmag_v =
| absmag_v =
}}
}}
{{Starbox detail
{{Starbox detail
| mass = {{nowrap|0.65}}<ref name=nasa_ames/>
| mass = 0.9{{±|0.03|0.10}}<ref name=Hadden2016/>
| luminosity = {{nowrap|0.59}}<ref name=nasa_ames/>
| luminosity = {{nowrap|0.59}}<ref name=nasa_ames/>
| temperature = {{nowrap|5400}}<ref name=nasa_ames/>
| temperature = {{nowrap|5400}}<ref name=nasa_ames/>
| metal_fe = {{nowrap|0.41}}<ref name=nasa_ames/>
| metal_fe = {{nowrap|0.41}}<ref name=nasa_ames/>
| radius = {{nowrap|}}<ref name=nasa_ames/>
| radius =
| rotational_velocity = {{nowrap|0.6}}<ref name=nasa_ames/>
| rotational_velocity = {{nowrap|0.6}}<ref name=nasa_ames/>
| age =
| age =
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = [[Kepler Object of Interest|KOI]]-935, [[Kepler Input Catalog|KIC]] 9347899, [[2MASS]] J19360552+4551110
| names = [[Kepler Object of Interest|KOI]]-841, [[Kepler Input Catalog|KIC]] 5792202, [[2MASS]] J19285682+4105091, Gaia DR2 2053586321364864640
}}
}}
{{Starbox reference
{{Starbox reference
| Simbad = Kepler-27
| Simbad = Kepler-27
| KIC = 9347899
| KIC = 5792202
}}
}}
{{Starbox end}}
{{Starbox end}}
'''Kepler-27''' is a [[star]] in the northern [[constellation]] of [[Cygnus (constellation)|Cygnus]], the swan, that is orbited by a planet found to be unequivocally within the star's [[habitable zone]]. It is located at the [[celestial coordinates]]: Right Ascension {{RA|19|28|56.825}}, Declination {{DEC|+41|05|09.15}}.<ref name=keplerdiscoveries>{{cite web |title=Kepler Discoveries |date=2011-12-05 |url=http://kepler.nasa.gov/Mission/discoveries/ }}</ref> With an [[apparent visual magnitude]] of 15.855,<ref name=nasa_ames/> this star is too faint to be seen with the naked eye.
'''Kepler-27''' is a [[star]] in the northern [[constellation]] of [[Cygnus (constellation)|Cygnus]], the swan. It is located at the [[celestial coordinates]]: Right Ascension {{RA|19|28|56.81962}}, Declination {{DEC|+41|05|09.1405}}.<ref name="Gaia DR3"/> With an [[apparent visual magnitude]] of 15.855,<ref name=nasa_ames/> this star is too faint to be seen with the naked eye.
⚫
[[File:Kepler-27.jpg|thumb|]]
==Planetary system==
The planetary system of Kepler-27 comprising two small gas giants on eccentric orbits<ref name=Hadden2016/> was discovered in late 2011.<ref name=Steffen2012/> The planets [[Kepler-27b]] and [[Kepler-27c]] have [[equilibrium temperature]]s of 610 [[Kelvin|K]] and 481 [[Kelvin|K]], respectively.<ref name=Furlan2017/> In 2021, a third, sub-Neptune-sized planet was confirmed, orbiting closer in than the other two planets.<ref name="Valizadegan2022"/><ref name="NASAExoplanetArchive"/>


{{OrbitboxPlanet begin
{{OrbitboxPlanet begin
| table_ref = <ref name=epe/>
| table_ref = <ref name=Furlan2017/><ref name="NASAExoplanetArchive"/>
}}
{{OrbitboxPlanet
| exoplanet = d
| mass =
| semimajor =
| period = 6.54629
| radius = 0.2414
}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = b
| exoplanet = b
| mass = 9.11
| mass = 0.1320{{±|0.018}}
| semimajor = 0.118
| semimajor = 0.118
| period = 15.3348
| period = 15.3348
| radius = 0.522{{±|0.024}}
| radius_earth =
}}
}}
{{OrbitboxPlanet
{{OrbitboxPlanet
| exoplanet = c
| exoplanet = c
| mass = 13.8
| mass = 0.0670{{±|0.011}}
| semimajor = 0.191
| semimajor = 0.191
| period = 31.3309
| period = 31.3309
| radius = 0.640{{±|0.029}}
| radius_earth = 4.1
}}
}}
{{Orbitbox end}}
{{Orbitbox end}}
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{{reflist|refs=
{{reflist|refs=


<ref name="Gaia DR2">{{Cite Gaia DR2|2053586321364864640}}</ref>
<ref name="Gaia DR3">{{Cite Gaia DR3|2053586321364864640}}</ref>

<ref name="NASAExoplanetArchive">{{cite web |title=Kepler-27 |url=https://exoplanetarchive.ipac.caltech.edu/overview/Kepler-27 |website=[[NASA Exoplanet Archive]] |accessdate=7 November 2022}}</ref>

<ref name=Steffen2012>{{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.|doi-access=free |bibcode=2012MNRAS.421.2342S |s2cid=11898578|display-authors=29}}</ref>

<ref name=Hadden2016>{{citation|arxiv=1611.03516|doi=10.3847/1538-3881/aa71ef|last1=Hadden|first1=Sam|last2=Lithwick|first2=Yoram|title=Kepler Planet Masses and Eccentricities from TTV Analysis |journal=The Astronomical Journal|year=2017 |volume=154|issue=1 |page=5|bibcode=2017AJ....154....5H |s2cid=118936786 |doi-access=free }}</ref>

<ref name=Furlan2017>{{citation|arxiv=1707.01942|year=2017|doi=10.3847/1538-3881/aa7b70|last1=Furlan|first1=E.|last2=Howell|first2=S. B.|title=The Densities of Planets in Multiple Stellar Systems|journal=The Astronomical Journal|volume=154|issue=2|page=66|bibcode=2017AJ....154...66F |s2cid=28833730 |doi-access=free }}</ref>

<ref name="Valizadegan2022">{{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 }}</ref>


}}
}}
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{{Stars of Cygnus}}
{{Stars of Cygnus}}


⚫
[[Category:Kepler-27| ]]
[[Category:Cygnus (constellation)]]
[[Category:Cygnus (constellation)]]
[[Category:G-type main-sequence stars]]
[[Category:G-type main-sequence stars]]
[[Category:Kepler objects of interest|27]]
[[Category:Kepler objects of interest|841]]
[[Category:Planetary transit variables]]
[[Category:Planetary transit variables]]
[[Category:Planetary systems with three confirmed planets]]
[[Category:2MASS objects|J19285682+4105091]]

Latest revision as of 05:24, 23 August 2024

Kepler-27
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 28m 56.81962s[2]
Declination +41° 05′ 09.1405″[2]
Apparent magnitude (V) 15.855[3]
Characteristics
Spectral type G5[4]
Astrometry
Proper motion (μ) RA: 2.171±0.033 mas/yr[2]
Dec.: −0.324±0.031 mas/yr[2]
Parallax (π)0.9298 ± 0.0281 mas[2]
Distance3,500 ± 100 ly
(1,080 ± 30 pc)
Details
Mass0.9+0.03
−0.10[5] M☉
Luminosity0.59[3] L☉
Temperature5400[3] K
Metallicity [Fe/H]0.41[3] dex
Rotational velocity (v sin i)0.6[3] km/s
Other designations
KOI-841, KIC 5792202, 2MASS J19285682+4105091, Gaia DR2 2053586321364864640
Database references
SIMBADdata
KICdata

Kepler-27 is a star in the northern constellation of Cygnus, the swan. It is located at the celestial coordinates: Right Ascension 19h 28m 56.81962s, Declination +41° 05′ 09.1405″.[2] With an apparent visual magnitude of 15.855,[3] this star is too faint to be seen with the naked eye.

Planetary system

[edit]

The planetary system of Kepler-27 comprising two small gas giants on eccentric orbits[5] was discovered in late 2011.[6] The planets Kepler-27b and Kepler-27c have equilibrium temperatures of 610 K and 481 K, respectively.[7] In 2021, a third, sub-Neptune-sized planet was confirmed, orbiting closer in than the other two planets.[8][9]

The Kepler-27 planetary system[7][9]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
d — — 6.54629 — — 0.2414 RJ
b 0.1320±0.018 MJ 0.118 15.3348 — — 0.522±0.024 RJ
c 0.0670±0.011 MJ 0.191 31.3309 — — 0.640±0.029 RJ

References

[edit]
  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
  2. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c d e f Kepler-27b, NASA Ames Research Center, archived from the original on 2012-05-03, retrieved 2011-12-06
  4. ^ Schneider, Jean, "Star: Kepler-27", Extrasolar Planets Encyclopaedia, archived from the original on 2012-04-26, retrieved 2011-12-06
  5. ^ a b Hadden, Sam; Lithwick, Yoram (2017), "Kepler Planet Masses and Eccentricities from TTV Analysis", The Astronomical Journal, 154 (1): 5, arXiv:1611.03516, Bibcode:2017AJ....154....5H, doi:10.3847/1538-3881/aa71ef, S2CID 118936786
  6. ^ Steffen, Jason H.; Fabrycky, Daniel C.; Ford, Eric B.; Carter, Joshua A.; Desert, Jean-Michel; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J.; Moorhead, Althea V.; Rowe, Jason F.; Ragozzine, Darin; Welsh, William F.; Batalha, Natalie M.; Borucki, William J.; Buchhave, Lars A.; Bryson, Steve; Caldwell, Douglas A.; Charbonneau, David; Ciardi, David R.; Cochran, William D.; Endl, Michael; Everett, Mark E.; Gautier III, Thomas N.; Gilliland, Ron L.; Girouard, Forrest R.; Jenkins, Jon M.; Horch, Elliott; Howell, Steve B.; Isaacson, Howard; et al. (2012), Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations, arXiv:1201.5412, Bibcode:2012MNRAS.421.2342S, doi:10.1111/j.1365-2966.2012.20467.x, S2CID 11898578
  7. ^ a b Furlan, E.; Howell, S. B. (2017), "The Densities of Planets in Multiple Stellar Systems", The Astronomical Journal, 154 (2): 66, arXiv:1707.01942, Bibcode:2017AJ....154...66F, doi:10.3847/1538-3881/aa7b70, S2CID 28833730
  8. ^ Valizadegan, Hamed; Martinho, Miguel J. S. (February 2022). "ExoMiner: A Highly Accurate and Explainable Deep Learning Classifier That Validates 301 New Exoplanets". The Astrophysical Journal. 926 (2): 120. arXiv:2111.10009. Bibcode:2022ApJ...926..120V. doi:10.3847/1538-4357/ac4399. S2CID 244954905.
  9. ^ a b "Kepler-27". NASA Exoplanet Archive. Retrieved 7 November 2022.


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