Tau Piscis Austrini
Star in the constellation Piscis Austrinus
From Wikipedia, the free encyclopedia
Tau Piscis Austrini (τ Piscis Austrini) is a solitary yellow-white star in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.9. Based on an annual parallax shift of 54.18 mas, the star is located approximately 60.2 light years from the Sun.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 22h 10m 08.78019s[1] |
| Declination | −32° 32′ 54.2703″[1] |
| Apparent magnitude (V) | +4.945[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F6 V[3] |
| U−B color index | +0.031[2] |
| B−V color index | +0.488[2] |
| Astrometry | |
| Proper motion (μ) | RA: +428.832[1] mas/yr Dec.: +13.475[1] mas/yr |
| Parallax (π) | 54.1773±0.0940 mas[1] |
| Distance | 60.2 ± 0.1 ly (18.46 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.58[4] |
| Details | |
| Mass | 1.34±0.13[5] M☉ |
| Radius | 1.45±0.04[5] R☉ |
| Luminosity | 2.82±0.09[5] L☉ |
| Surface gravity (log g) | 4.11[6] cgs |
| Temperature | 6,324[4] K |
| Metallicity [Fe/H] | −0.01[6] dex |
| Rotational velocity (v sin i) | 14.1±0.7[4] km/s |
| Age | 1.3[7] Gyr |
| Other designations | |
| τ PsA, 15 Piscis Austrini, CPD−33°6227, HD 210302, HIP 109422, HR 8447, SAO 213602[8] | |
| Database references | |
| SIMBAD | data |
This is an F-type main sequence star with a stellar classification of F6 V.[3] It is about 1.3[7] billion years old with a projected rotational velocity of 14[4] km/s and exhibits a low level of activity.[9] The star has an estimated 1.34 times the mass of the Sun and 1.45 times the Sun's radius.[5] It is radiating 2.82[5] times the solar luminosity from its photosphere at an effective temperature of 6,324 K.[4] This star is a candidate for hosting a debris disk, having initially shown a near-infrared excess, which diminished with further observations.[10]
Naming
In Chinese, 天錢 (Tiān Qián), meaning Celestial Money, refers to an asterism consisting of τ Piscis Austrini, 13 Piscis Austrini, θ Piscis Austrini, ι Piscis Austrini and μ Piscis Austrini. Consequently, the Chinese name for τ Piscis Austrini itself is 天錢五 (Tiān Qián wǔ, English: the Fifth Star of Celestial Money.)[11]