Delta Piscium

Delta Piscium
Location of δ Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 00h 48m 40.9443s[1]
Declination +07° 35′ 06.2949″[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: +81.994 mas/yr[1]
Dec.: −50.232 mas/yr[1]
Parallax (π)10.8577 ± 0.1787 mas[1]
Distance300 ± 5 ly
(92 ± 2 pc)
Absolute magnitude (MV)−0.46[5]
Details
Mass1.65[3] M☉
Radius38.01+0.71
−0.73[6] R☉
Luminosity291.7±13.3[6] L☉
Surface gravity (log g)1.88[1] cgs
Temperature3868±35[6] K
Metallicity [Fe/H]−0.19[1] dex
Rotational velocity (v sin i)5.5[4] km/s
Age2.98[3] Gyr
Other designations
δ Psc, 63 Piscium, BD+06° 107, FK5 28, HD 4656, HIP 3786, HR 224, SAO 109474, WDS J00487+0735A[7]
Database references
SIMBADdata

Delta Piscium (δ Piscium) is a solitary,[8] 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 10.86 mas, it is around 300 light-years (92 parsecs) from the Sun.[1] The visual magnitude of the star is diminished by an interstellar absorption factor of 0.08 due to interstellar dust.[9]

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 38[6] times the Sun's radius. The star is radiating 292 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,868 K.[6]

Because Delta Piscium is positioned near the ecliptic, so it is subject to lunar occultations.[10] 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.[11]

  1. ^ a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Cite error: The named reference Cousins1984 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference baines2021 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Meyer1995 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).