Delta Piscium
Delta Piscium (δ Piscium) is a solitary, orange-hued star in the zodiac constellation of Pisces. It has an apparent visual magnitude of +4.4, so it is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 10.5 mas, it is around 311 light-years (95 parsecs) from the Sun. The visual magnitude of the star is diminished by an interstellar absorption factor of 0.08 due to interstellar dust.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 48m 40.94433s |
| Declination | +07° 35′ 06.2926″ |
| Apparent magnitude (V) | +4.416 |
| Characteristics | |
| Spectral type | K4 IIIb |
| U−B color index | +1.831 |
| B−V color index | +1.500 |
| Astrometry | |
| Radial velocity (Rv) | +32.45±0.18 km/s |
| Proper motion (μ) | RA: +83.10 mas/yr Dec.: −49.58 mas/yr |
| Parallax (π) | 10.48 ± 0.22 mas |
| Distance | 311 ± 7 ly (95 ± 2 pc) |
| Absolute magnitude (MV) | −0.46 |
| Details | |
| Mass | 1.65 M☉ |
| Radius | 44 R☉ |
| Luminosity | 447 L☉ |
| Surface gravity (log g) | 1.0 cgs |
| Temperature | 3,963±4 K |
| Metallicity [Fe/H] | −0.20 dex |
| Rotational velocity (v sin i) | 5.5 km/s |
| Age | 2.98 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K4 IIIb. It has around 1.65 times the mass of the Sun and, at the age of three billion years, has expanded to 44 times the Sun's radius. The star is radiating 447 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,963 K.
Because Delta Piscium is positioned near the ecliptic, so it is subject to lunar occultations. It has a magnitude 13.99 visual companion at an angular separation of 135.0 arc seconds on a position angle of 12°, as of 2011.