HD 106315
HD 106315, or K2-109, is a single star with a pair of close-orbiting exoplanets, located in the constellation of Virgo. Based on parallax measurements, this system lies at a distance of 356 light years from the Sun. At that range, the star is too faint to be seen with the naked eye, as it has an apparent visual magnitude of 8.95. But it is slowly drifting closer with a radial velocity of −3 km/s. As of 2020, multiplicity surveys have not detected any stellar companions to HD 106315.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 13m 53.3962s |
| Declination | −00° 23′ 36.5534″ |
| Apparent magnitude (V) | 8.951 |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | F5V |
| B−V color index | 0.45 |
| Astrometry | |
| Radial velocity (Rv) | −3.2±0.3 km/s |
| Proper motion (μ) | RA: −2.36±0.03 mas/yr Dec.: 11.943±0.019 mas/yr |
| Parallax (π) | 9.1725 ± 0.0221 mas |
| Distance | 355.6 ± 0.9 ly (109.0 ± 0.3 pc) |
| Details | |
| Mass | 1.105+0.028 −0.036 M☉ |
| Radius | 1.286+0.049 −0.040 R☉ |
| Luminosity | 2.432+0.057 −0.234 L☉ |
| Surface gravity (log g) | 4.261+0.027 −0.024 cgs |
| Temperature | 6,300±37 K |
| Metallicity [Fe/H] | −0.268+0.060 −0.071 dex |
| Rotation | 4.78±0.15 |
| Rotational velocity (v sin i) | 12.9±0.4 km/s |
| Age | 3.987+0.802 −0.516 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of HD 106315 presents as an ordinary F-type main-sequence star with a stellar classification of F5V, indicating it is generating energy through hydrogen fusion at its core. It is estimated to be roughly four billion years old but is spinning quickly with a rotation period of 5 days. The star is relatively metal-poor, having 60% of solar concentration of iron. It has only a low level of magnetic activity in its chromosphere, showing a minimal level of star spot coverage. The star has 11% more mass and a 29% larger radius than the Sun. It is radiating 2.4 times the luminosity of the Sun from its photosphere at an effective temperature of 6,300 K.