| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h47m 50.4746s[1] |
| Declination | +46° 02′ 03.500″[1] |
| Apparent magnitude (V) | 14.3[2] |
| Characteristics | |
| Spectral type | F7V[3] |
| Astrometry | |
| Proper motion (μ) | RA: 3.894(18) mas/yr[1] Dec.: −2.345(17) mas/yr[1] |
| Parallax (π) | 0.9316 ± 0.0139 mas[1] |
| Distance | 3,500 ± 50 ly (1,070 ± 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 | |
KOI-423, KIC 9478990, Gaia DR2 2080168561154800384, 2MASS J19475046+4602034 | |
| 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 3,500 light-years (1,070 parsecs) away.[1] One known substellar companion orbits it, Kepler-39b.[5]
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 |
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