HD 27894
HD 27894 is a single star with a system of orbiting exoplanets, located in the southern constellation of Reticulum. It is too faint to be seen with the naked eye at an apparent visual magnitude of 9.36. This system lies at a distance of 142.5 light years from the Sun, as determined via parallax measurements, and is drifting further away with a radial velocity of 83 km/s.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Reticulum |
| Right ascension | 04h 20m 47.046s |
| Declination | −59° 24′ 39.02″ |
| Apparent magnitude (V) | 9.36 |
| Characteristics | |
| Spectral type | K2 V |
| U−B color index | +0.90 |
| B−V color index | +1.003±0.002 |
| Astrometry | |
| Radial velocity (Rv) | 82.785±0.0008 km/s |
| Proper motion (μ) | RA: 182.473±0.012 mas/yr Dec.: 270.012±0.017 mas/yr |
| Parallax (π) | 22.8888 ± 0.0121 mas |
| Distance | 142.50 ± 0.08 ly (43.69 ± 0.02 pc) |
| Absolute magnitude (MV) | 6.225 |
| Details | |
| Mass | 0.83±0.03 M☉ |
| Radius | 0.79±0.02 R☉ |
| Luminosity | 0.33±0.01 L☉ |
| Surface gravity (log g) | 4.56±0.03 cgs |
| Temperature | 4,923±32 K |
| Metallicity [Fe/H] | +0.30±0.07 dex |
| Rotation | 44 days |
| Rotational velocity (v sin i) | ≤ 1.5 km/s |
| Age | 7.7±2.3 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The spectrum of HD 27894 presents as a K-type main-sequence star, an orange dwarf, with a stellar classification of K2 V. This is a quiescent solar-type star that displays no significant magnetic activity in its chromosphere and is spinning slowly with a rotation period of roughly 44 days. The abundance of iron in the star is much higher than in the Sun, an indicator that it is metal-rich. It has 83% of the mass of the Sun and 79% of the Sun's radius. The star is radiating 33% of the luminosity of the Sun from its photosphere at an effective temperature of 4,923 K.