Astronomy:Kepler-26

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Short description: Star in the constellation Lyra
Kepler-26
Kepler-26 system (1).png
The Kepler-26 system, with the circumstellar habitable zone in green.
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lyra[1]
Right ascension  18h 59m 45.8407s[2]
Declination +46° 33′ 59.438″[2]
Apparent magnitude (V) 15.473[3]
Characteristics
Spectral type M0V[4]
Astrometry
Proper motion (μ) RA: 9.540±0.053[2] mas/yr
Dec.: −13.961±0.055[2] mas/yr
Parallax (π)2.9537 ± 0.0270[2] mas
Distance1,100 ± 10 ly
(339 ± 3 pc)
Details
Mass0.65[3] M☉
Radius0.59[3] R☉
Luminosity0.1[3] L☉
Temperature4500[3] K
Metallicity [Fe/H]-0.21[3] dex
Rotation17.918±0.005 days[5]
Rotational velocity (v sin i)1.9[3] km/s
Other designations
KOI-250, KIC 9757613, 2MASS J18594583+4633595, Gaia DR2 2107317358665730688
Database references
SIMBADdata
KICdata

Kepler-26 is a star in the northern constellation of Lyra. It is located at the celestial coordinates: Right Ascension  18h 59m 45.8407s Declination +46° 33′ 59.438″.[2] With an apparent visual magnitude of 15.5,[3] 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,[6] and classified as small (sub-Neptune) gas giants in 2016.[7] In 2012, the planetary candidate Kepler-26d was also detected, and confirmed in 2014.[8] The planet Kepler-26e was discovered on a much wider orbit in 2014.[9]

The Kepler-26 planetary system[4][7][10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
d — 0.039 3.543919 — — 1.2 R⊕
b 5.1±0.7 M⊕ 0.085 12.2829 — — 2.78±0.11 R⊕
c 6.2±0.7 M⊕ 0.107 17.2513 — — 2.72±0.12 R⊕
e — 0.22 46.827915 — — 2.1 R⊕

References

  1. ↑ "Lyra – constellation boundary", The Constellations, International Astronomical Union, http://www.iau.org/public/constellations/#lyr, retrieved 2011-12-15 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Kepler-26b, NASA Ames Research Center, http://kepler.nasa.gov/Mission/discoveries/kepler25b/, retrieved 2011-12-06 
  4. ↑ 4.0 4.1 Schneider, Jean, Star: Kepler-26, http://exoplanet.eu/star.php?st=Kepler-26, retrieved 2013-12-18 
  5. ↑ McQuillan, A.; Mazeh, T.; Aigrain, S. (2013). "Stellar Rotation Periods of The Kepler objects of Interest: A Dearth of Close-In Planets Around Fast Rotators". The Astrophysical Journal Letters 775 (1): L11. doi:10.1088/2041-8205/775/1/L11. Bibcode: 2013ApJ...775L..11M. 
  6. ↑ Steffen, Jason H.; Fabrycky, Daniel C.; Ford, Eric B.; Carter, Joshua A.; Desert, Jean-Michel; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J. 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", Monthly Notices of the Royal Astronomical Society 421 (3): 2342, doi:10.1111/j.1365-2966.2012.20467.x, Bibcode: 2012MNRAS.421.2342S 
  7. ↑ 7.0 7.1 Cubillos, Patricio; Erkaev, Nikolai V.; Juvan, Ines; Fossati, Luca; Johnstone, Colin P.; Lammer, Helmut; Lendl, Monika; Odert, Petra et al. (2016), "An overabundance of low-density Neptune-like planets", Monthly Notices of the Royal Astronomical Society 466 (2): 1868–1879, doi:10.1093/mnras/stw3103 
  8. ↑ Rowe, Jason F.; Bryson, Stephen T.; Marcy, Geoffrey W.; Lissauer, Jack J.; Jontof-Hutter, Daniel; Mullally, Fergal; Gilliland, Ronald L.; Issacson, Howard et al. (2014). "Validation Ofkepler's Multiple Planet Candidates. III. Light Curve Analysis and Announcement of Hundreds of New Multi-Planet Systems". The Astrophysical Journal 784 (1): 45. doi:10.1088/0004-637X/784/1/45. Bibcode: 2014ApJ...784...45R. 
  9. ↑ Planet Kepler-26 e on exoplanet.eu
  10. ↑ Jontof-Hutter, Daniel; Ford, Eric B.; Rowe, Jason F.; Lissauer, Jack J.; Fabrycky, Daniel C.; Christa Van Laerhoven; Agol, Eric; Deck, Katherine M. et al. (2015), Secure TTV Mass Measurements: Ten Kepler Exoplanets between 3 and 8 M🜨 with Diverse Densities and Incident Fluxes, doi:10.3847/0004-637X/820/1/39 

Coordinates: Sky map 18h 59m 45.839s, +46° 33′ 59.54″



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