Kepler-39
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 47m 50.4746s[1]
Declination +46° 02′ 03.499″[1]
Apparent magnitude (V) 14.3[2]
Characteristics
Spectral type F7V[3]
Astrometry
Proper motion (μ) RA: 3.890±0.034[1] mas/yr
Dec.: −2.307±0.031[1] mas/yr
Parallax (π)0.9171 ± 0.0164 mas[1]
Distance3,560 ± 60 ly
(1,090 ± 20 pc)
Details[3]
Mass1.29+0.06
−0.07 M☉
Radius1.40±0.10 R☉
Surface gravity (log g)4.25±0.06 cgs
Temperature6350±100 K
Metallicity [Fe/H]0.10±0.14 dex
Rotation4.464±0.013 days[4]
Rotational velocity (v sin i)16±2.5 km/s
Age2.1+0.8
−0.9 Gyr
Other designations
KOI-423, KIC 9478990, Gaia DR2 2080168561154800384, 2MASS J19475046+4602034
Database references
SIMBADdata
KICdata

Kepler-39 (2MASS J19475046+4602034) is an F-type main sequence star located in the constellation Cygnus. It is located about 3,560 light-years (1,090 parsecs) away.[1] One known substellar companion orbits it, Kepler-39b.[5]

Planetary system

Kepler-39b is generally considered a brown dwarf rather than a planet since it does not meet the standard definition of planet. Some authorities such as the Extrasolar Planets Encyclopaedia and the NASA Exoplanet Archive include it among their list of confirmed planets.[2][6]

The Kepler-39 planetary system[3]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 20.1+1.3
−1.2 MJ 		0.164±0.003 21.087210±0.000037 0.112±0.057 89.07±0.22° 1.24+0.09
−0.10 RJ

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b "Kepler-39 b". Extrasolar Planets Encyclopaedia. Retrieved 2018-06-09.
  3. ^ a b c Bonomo, A. S.; et al. (2015). "Improved parameters of seven Kepler giant companions characterized with SOPHIE and HARPS-N". Astronomy and Astrophysics. 575. A85. arXiv:1501.02653. Bibcode:2015A&A...575A..85B. doi:10.1051/0004-6361/201323042. S2CID 119230291.
  4. ^ 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. arXiv:1308.1845. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11. S2CID 118557681.
  5. ^ Bouchy, F.; et al. (2011). "SOPHIE velocimetry of Kepler transit candidates. III. KOI-423b: an 18 MJup transiting companion around an F7IV star". Astronomy and Astrophysics. 533. A83. arXiv:1106.3225. Bibcode:2011A&A...533A..83B. doi:10.1051/0004-6361/201117095. S2CID 62836749.
  6. ^ "Kepler-39 b". NASA Exoplanet Archive. Retrieved 2018-06-09.
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