HD 204313
HD 204313 is a star with two and possibly three exoplanetary companions in the southern constellation of Capricornus. With an apparent magnitude of 7.99, it is an eighth magnitude star that is too faint to be readily visible to the naked eye. The star is located at a distance of 157 light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −10 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Capricornus |
| Right ascension | 21h 28m 12.20609s |
| Declination | −21° 43′ 34.5182″ |
| Apparent magnitude (V) | 7.99 |
| Characteristics | |
| Spectral type | G5V |
| Apparent magnitude (B) | 8.687 |
| Apparent magnitude (J) | 6.812±0.024 |
| Apparent magnitude (H) | 6.539±0.040 |
| Apparent magnitude (K) | 6.459±0.018 |
| B−V color index | 0.697±0.022 |
| Astrometry | |
| Radial velocity (Rv) | −9.79±0.12 km/s |
| Proper motion (μ) | RA: 42.751 mas/yr Dec.: −270.443 mas/yr |
| Parallax (π) | 20.7705 ± 0.0343 mas |
| Distance | 157.0 ± 0.3 ly (48.15 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.61 |
| Details | |
| Mass | 1.06±0.03 M☉ |
| Radius | 1.08±0.03 R☉ |
| Luminosity | 1.18±0.03 L☉ |
| Surface gravity (log g) | 4.39±0.04 cgs |
| Temperature | 5,783±48 K |
| Metallicity [Fe/H] | 0.18 dex |
| Rotational velocity (v sin i) | 0.846 km/s |
| Age | 4.3±1.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
This is an ordinary G-type main-sequence star with a stellar classification of G5V, which indicates it is generating energy through hydrogen fusion at its core. It is an estimated four billion years old, chromospherically extremely quiet, and is spinning with a projected rotational velocity of just 0.8 km/s. The star has a slightly larger mass and radius compared to the Sun. It is radiating 118% of the luminosity of the Sun from its photosphere at an effective temperature of 5,783 K.