Tau Piscium

Tau Piscium
Location of τ Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 11m 39.63647s[1]
Declination +30° 05′ 22.6909″[1]
Apparent magnitude (V) +4.518[2]
Characteristics
Spectral type K0.5 IIIb[3]
U−B color index +1.016[2]
B−V color index +1.094[2]
Astrometry
Radial velocity (Rv)36.36±0.34[4] km/s
Proper motion (μ) RA: +73.88[1] mas/yr
Dec.: −38.30[1] mas/yr
Parallax (π)19.32 ± 0.24 mas[1]
Distance169 ± 2 ly
(51.8 ± 0.6 pc)
Absolute magnitude (MV)+1.033[5]
Details[4]
Mass1.69[6] M☉
Radius10 R☉
Luminosity44.7 L☉
Surface gravity (log g)2.6 cgs
Temperature4,624±5 K
Metallicity [Fe/H]−0.04 dex
Rotational velocity (v sin i)2.2 km/s
Age2.27[4] Gyr
Other designations
τ Psc, 83 Piscium, BD+29° 190, FK5 43, HD 7106, HIP 5586, HR 352, SAO 74546[7]
Database references
SIMBADdata

Tau Piscium (τ Piscium) is an orange-hued star in the zodiac constellation of Pisces. With an apparent visual magnitude of +4.52,[2] it is a dim star but visible to the naked eye. Based upon an annual parallax shift of 19.32 mas as seen from Earth,[1] it is located around 169 light years from the Sun. It is most likely (96% chance) a member of the thin disk population.[5]

This is an evolved K-type giant star with a stellar classification of K0.5 IIIb.[3] It is about 2.27[4] billion years and is a red clump star on the horizontal branch, which indicates it is generating energy through helium fusion at its core.[8] The star has 1.7[6] times the mass of the Sun and has expanded to about 10 times the Sun's radius.[4] It is radiating 45 times the Sun's luminosity from its photosphere at an effective temperature of 4,624 K.[4]

  1. ^ a b c d e f 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 Jennens1975 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Keenan1989 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran2008 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Luck2015 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 Mishenina2006 was invoked but never defined (see the help page).