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Kepler-39 
Summary
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]
| 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] |
| 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 |
Planetary system edit
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 edit
- ^ 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.
- ^ a b "Kepler-39 b". Extrasolar Planets Encyclopaedia. Retrieved 2018-06-09.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ "Kepler-39 b". NASA Exoplanet Archive. Retrieved 2018-06-09.