Delta Piscis Austrini
Star in the constellation Piscis Austrinus / From Wikipedia, the free encyclopedia
Delta Piscis Austrini, Latinized from δ Piscis Austrini, is a yellow-hued star[3] in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.175.[2] There is a magnitude 9.86[3] common proper motion[3] companion located at an angular separation of 5.2 arc seconds – the pair most likely form a binary star system.[10] Based upon an annual parallax shift of 18.9796 mas as seen from the Gaia satellite, Delta Piscis Austrini is located 172 ± 2 light-years from the Sun.[6]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Piscis Austrinus |
Right ascension | 22h 55m 56.90026s[1] |
Declination | −32° 32′ 22.6335″[1] |
Apparent magnitude (V) | +4.175[2] (4.18 + 9.86)[3] |
Characteristics | |
δ PsA A | |
Spectral type | G8 III[4] |
U−B color index | +0.72[2] |
B−V color index | +0.94[2] |
δ PsA B | |
Spectral type | G8 IV[3] |
U−B color index | +0.77[3] |
B−V color index | +0.67[3] |
Astrometry | |
Radial velocity (Rv) | −11.60[5] km/s |
Proper motion (μ) | RA: +11.499 ± 0.398[6] mas/yr Dec.: +32.641 ± 0.379[6] mas/yr |
Parallax (π) | 18.9796 ± 0.2558 mas[6] |
Distance | 172 ± 2 ly (52.7 ± 0.7 pc) |
Absolute magnitude (MV) | +0.636[7] |
Details | |
δ PsA A | |
Mass | 1.42[5] M☉ |
Luminosity | 52[5] L☉ |
Surface gravity (log g) | 2.72±0.10[5] cgs |
Temperature | 4,828±29[5] K |
Metallicity [Fe/H] | −0.21±0.10[8] dex |
Age | 3.74[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
The primary, component A, is an evolved G-type giant star with a stellar classification of G8 III.[4] At the age of about 3.74 billion years[5] it is a red clump star, which indicates it is generating energy through helium fusion at its core.[7] The star has an estimated 1.42 times the mass of the Sun and it radiates 52 times the solar luminosity from its photosphere at an effective temperature of 4.828 K.[5]
Delta Piscis Austrini is moving through the Galaxy at a speed of 13.8 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,048 and 35,430 light-years from the center of the Galaxy.[11]