Kepler-39

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[1] mas
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, 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 there 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. 1 2 3 4 5 6 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 Data Release 2 Vizier catalog entry
  2. 1 2 "Kepler-39 b". The Extrasolar Planets Encyclopaedia. Retrieved 2018-06-09.
  3. 1 2 3 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.
  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.
  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.
  6. ↑ "Kepler-39 b". NASA Exoplanet Archive. Retrieved 2018-06-09.


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