  | |
| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 11m 39.63647s[1] |
| Declination | +30° 05′ 22.6909″[1] |
| Apparent magnitude (V) | +4.518[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K0.5 IIIb[4] |
| U−Bcolor index | +1.016[2] |
| B−Vcolor index | +1.094[2] |
| Astrometry | |
| Radial velocity (Rv) | 36.36±0.34[5] 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] |
| Distance | 169 ± 2 ly (51.8 ± 0.6 pc) |
| Absolute magnitude (MV) | +1.033[6] |
| Details[5] | |
| Mass | 1.69[7] M☉ |
| Radius | 10 R☉ |
| Luminosity | 44.7 L☉ |
| Surface gravity (log g) | 2.6 cgs |
| Temperature | 4,624±5 K |
| Metallicity[Fe/H] | −0.04 dex |
| Rotational velocity (v sin i) | 2.2 km/s |
| Age | 2.27[5] Gyr |
| Other designations | |
| τ Psc,83 Piscium,BD+29°190,FK5 43,HD 7106,HIP 5586,HR 352,SAO 74546[8] | |
| Database references | |
| SIMBAD | data |
Tau Piscium (τ Piscium) is an orange-huedstar in thezodiacconstellation ofPisces. With anapparent visual magnitude of +4.52,[2] it is a dim star but visible to the naked eye. Based upon an annualparallax shift of 19.32 mas as seen from Earth,[1] it is located around 169 light years from theSun. It is most likely (96% chance) a member of thethin disk population.[6]
This is anevolvedK-typegiant star with astellar classification of K0.5 IIIb.[4] It is about 2.27[5] billion years and is ared clump star on thehorizontal branch, which indicates it is generating energy throughhelium fusion at itscore.[3] The star has 1.7[7] times themass of the Sun and has expanded to about 10 times theSun's radius.[5] It is radiating 45 times theSun's luminosity from itsphotosphere at aneffective temperature of 4,624 K.[5]
InChinese,奎宿 (Kuí Sù), meaningLegs, refers to an asterism consisting of τ Piscium,η Andromedae,65 Piscium,ζ Andromedae,ε Andromedae,δ Andromedae,π Andromedae,ν Andromedae,μ Andromedae,β Andromedae,σ Piscium,91 Piscium,υ Piscium,φ Piscium,χ Piscium andψ¹ Piscium. Consequently, theChinese name for τ Piscium itself is奎宿十一 (Kuí Sù shíyī, English:the Eleventh Star of Legs.)[9]
{{cite web}}: CS1 maint: postscript (link)