Delta Piscis Austrini

Delta Piscis Austrini
Location of δ Piscis Austrini (circled)
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]
Distance172 ± 2 ly
(52.7 ± 0.7 pc)
Absolute magnitude (MV)+0.636[7]
Details
δ PsA A
Mass1.42[5] M☉
Luminosity52[5] L☉
Surface gravity (log g)2.72±0.10[5] cgs
Temperature4,828±29[5] K
Metallicity [Fe/H]−0.21±0.10[8] dex
Age3.74[5] Gyr
Other designations
δ PsA, 23 Piscis Austrini, CD−33° 16303, HD 216763, HIP 113246, HR 8720, SAO 214189, WDS J22559-3232A[9]
Database references
SIMBADdata

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]

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]

  1. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Rakos1982 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference corbally1984 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  6. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ a b Cite error: The named reference Liu2007 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Alves2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).