HD 4313
HD 4313 is a star with an orbiting exoplanetary companion in the constellation of Pisces. It has an apparent visual magnitude of 7.83, which is too faint to be reading visible to the unaided eye. The systam is located at a distance of 446 light years based on parallax, and is drifting further away with a radial velocity of 14.5 km/s. This is a single star, which means it has no binary partners, at least in range of projected separations from 6.85 to 191.78 AU. It hosts an extrasolar planet.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 45m 40.3578s |
| Declination | +07° 50′ 42.075″ |
| Apparent magnitude (V) | 7.83 |
| Characteristics | |
| Evolutionary stage | Subgiant |
| Spectral type | K2 IV |
| B−V color index | 0.963±0.017 |
| Astrometry | |
| Radial velocity (Rv) | 14.48±0.23 km/s |
| Proper motion (μ) | RA: −6.281 mas/yr Dec.: 6.566 mas/yr |
| Parallax (π) | 7.3090 ± 0.0879 mas |
| Distance | 446 ± 5 ly (137 ± 2 pc) |
| Absolute magnitude (MV) | 2.17 |
| Details | |
| Mass | 1.61+0.13 −0.12 M☉ |
| Radius | 5.15+0.18 −0.17 R☉ |
| Luminosity | 15.81 L☉ |
| Surface gravity (log g) | 3.24 cgs |
| Temperature | 4,966±40 K |
| Metallicity [Fe/H] | 0.05±0.10 dex |
| Rotational velocity (v sin i) | 1.91±0.25 km/s |
| Age | 2.03+0.64 −0.45 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging K-type star with a mass of nearly twice the Sun, although different methods give mass estimates which differ as much as 0.5 M☉. It is a swollen star with 5.14 times the radius of the Sun, and has a cool effective temperature of 4,966±40 k. The "IV" in the spectral class means it's a K-type subgiant star which has exhausted the hydrogen at its core, and cooling and expanding to become a red giant. It is around two billion years in age and is spinning with a projected rotational velocity of 1.9 km/s.