Astronomy:Kepler-39
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Short description: Star in the constellation Cygnus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 3,560 ± 60 ly (1,090 ± 20 pc) |
| Details[3] | |
| Mass | 1.29+0.06 −0.07 M☉ |
| Radius | 1.40±0.10 R☉ |
| Surface gravity (log g) | 4.25±0.06 cgs |
| Temperature | 6350±100 K |
| Metallicity [Fe/H] | 0.10±0.14 dex |
| Rotation | 4.464±0.013 days[4] |
| Rotational velocity (v sin i) | 16±2.5 km/s |
| Age | 2.1+0.8 −0.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
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]
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 "Kepler-39 b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/kepler_39_b--1376/. Retrieved 2018-06-09.
- ↑ 3.0 3.1 3.2 Bonomo, A. S. et al. (2015). "Improved parameters of seven Kepler giant companions characterized with SOPHIE and HARPS-N". Astronomy and Astrophysics 575: A85. doi:10.1051/0004-6361/201323042. Bibcode: 2015A&A...575A..85B. https://www.aanda.org/articles/aa/full_html/2015/03/aa23042-13/aa23042-13.html.
- ↑ 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.
- ↑ 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. doi:10.1051/0004-6361/201117095. Bibcode: 2011A&A...533A..83B. https://www.aanda.org/articles/aa/full_html/2011/09/aa17095-11/aa17095-11.html.
- ↑ "Kepler-39 b". NASA Exoplanet Archive. https://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=Kepler-39+b&type=CONFIRMED_PLANET.
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