Kepler-63
Star in the constellation Cygnus
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Kepler-63 is a G-type main-sequence star about 638 light-years away. The star is much younger than the Sun, at 0.21 billion years. Kepler-63 is similar to the Sun in its concentration of heavy elements.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 16m 54.2861s[2] |
| Declination | 49° 32′ 53.451″[2] |
| Apparent magnitude (V) | 12.02[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[2] |
| Spectral type | G2V[4] |
| Astrometry | |
| Radial velocity (Rv) | −21.7±0.8[2] km/s |
| Proper motion (μ) | RA: 14.375[2] mas/yr Dec.: 23.336[2] mas/yr |
| Parallax (π) | 5.1157±0.0096 mas[2] |
| Distance | 638 ± 1 ly (195.5 ± 0.4 pc) |
| Details[5] | |
| Mass | 0.984+0.035 −0.040 M☉ |
| Radius | 0.901+0.027 −0.021 R☉ |
| Luminosity | 0.696+0.076 −0.059[3] L☉ |
| Surface gravity (log g) | 4.52±0.02 cgs |
| Temperature | 5576±50 K |
| Metallicity [Fe/H] | 0.05±0.08[3] dex |
| Rotation | 5.4±0.009 days |
| Rotational velocity (v sin i) | 5.6±0.8[3] km/s |
| Age | 0.21±0.045 Gyr |
| Other designations | |
| KOI-63, TYC 3550-458-1, 2MASS J19165428+4932535[6] | |
| Database references | |
| SIMBAD | data |
The star is exhibiting strong starspot activity, with relatively cold (4700±300 K) starspots concentrated in two mid-latitude bands similar to the Sun,[5] changing their position in a cycle with a period of 1.27±0.16 years.[7] Due to high magnetic activity associated with its young age, Kepler-63 has a very hot corona heated to 8 million degrees, and produces over ten times the solar amount of x-rays than the Sun.[8]
Multiplicity surveys did not detect any stellar companions to Kepler-63 by 2016.[9]
Planetary system
In 2013 a transiting hot Jupiter planet b was detected on a tight orbit. The orbit is nearly polar to the equatorial plane of the star.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | < 0.377[8] MJ | 0.080±0.002[8] | 9.4341505±0.000001[5] | <0.45[3] | 87.806+0.018 −0.019[5]° |
0.54±0.02[8] RJ |