Delta Piscium (δ Piscium) is a solitary,[7] orange-hued star in the zodiac constellation of Pisces. It has an apparent visual magnitude of +4.4,[2] 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.[6] The visual magnitude of the star is diminished by an interstellar absorption factor of 0.08 due to interstellar dust.[8]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Pisces |
Right ascension | 00h 48m 40.94433s[1] |
Declination | +07° 35′ 06.2926″[1] |
Apparent magnitude (V) | +4.416[2] |
Characteristics | |
Spectral type | K4 IIIb[3] |
U−B color index | +1.831[2] |
B−V color index | +1.500[2] |
Astrometry | |
Radial velocity (Rv) | +32.45±0.18[4] km/s |
Proper motion (μ) | RA: +83.10[1] mas/yr Dec.: −49.58[1] mas/yr |
Parallax (π) | 10.48 ± 0.22 mas[1] |
Distance | 311 ± 7 ly (95 ± 2 pc) |
Absolute magnitude (MV) | −0.46[5] |
Details[4] | |
Mass | 1.65[3] 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[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K4 IIIb.[3] It has around 1.65 times the mass of the Sun and, at the age of three billion years,[3] has expanded to 44[4] 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.[4]
Because Delta Piscium is positioned near the ecliptic, so it is subject to lunar occultations.[9] 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.[10]
In Chinese, 外屏 (Wài Píng), meaning Outer Fence, refers to an asterism of stars, δ Piscium, ε Piscium, ζ Piscium, μ Piscium, ν Piscium, ξ Piscium and α Piscium. Consequently, the Chinese name for δ Piscium itself is 外屏一 (Wài Píng yī, English: the First Star of Outer Fence.)[11]
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