Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 53m 34.8643s [1] |
Declination | +47° 48′ 54.050″ [1] |
Apparent magnitude (V) | 14.0 [2] |
Astrometry | |
Proper motion (μ) |
RA: −3.778±0.032
[1]
mas/
yr Dec.: −6.365±0.035 [1] mas/ yr |
Parallax (π) | 1.3589 ± 0.0198 mas [1] |
Distance | 2,400 ± 30
ly (740 ± 10 pc) |
Characteristics | |
Spectral type | G2V [2] |
Details [2] | |
Mass | 1.16±0.06 M☉ |
Radius | 1.05±0.03 R☉ |
Temperature | 5781±85 K |
Metallicity [Fe/H] | 0.26 (± 0.1) dex |
Rotation | 12.159±0.029 days [3] |
Rotational velocity (v sin i) | 4.2±0.5 [4] km/s |
Age | 3.0±1.6 [5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
KIC | data |
Kepler-17 is a main-sequence yellow dwarf star that is much more active than the Sun with starspots covering roughly 6% of its surface. [6] Starspots are long-lived, with at least one persisting for 1400 days. [7]
The Kepler-17 is known to host one superjovian exoplanet, Kepler-17b, in orbit around it. It was discovered by the transit method in 2011. [8]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 2.45±0.014 MJ | 0.02591±0.00037 | 1.4857108±2e-07 | <0.011 | 87.2±0.15 ° | 1.312±0.018 RJ |