Psi Tauri
Star in the constellation Taurus
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Psi Tauri, which is Latinized from ψ Tauri, is a solitary[9] star in the zodiac constellation of Taurus. It has a yellow-white hue and is visible to the naked eye with an apparent visual magnitude of +5.22.[2] The distance to this system, as determined using an annual parallax shift of 36.2 mas as seen from the Earth,[10] is 91 light years. It is drifting further away with a radial velocity of +9 km/s.
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 07m 00.45695s[1] |
| Declination | +29° 00′ 04.7093″[1] |
| Apparent magnitude (V) | +5.22[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F1 V[3] |
| U−B color index | −0.01[2] |
| B−V color index | +0.34[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.15±0.42[4] km/s |
| Proper motion (μ) | RA: −91.661[1] mas/yr Dec.: +8.096[1] mas/yr |
| Parallax (π) | 35.9320±0.1055 mas[1] |
| Distance | 90.8 ± 0.3 ly (27.83 ± 0.08 pc) |
| Absolute magnitude (MV) | 3.01[5] |
| Details | |
| Mass | 1.59[5] M☉ |
| Radius | 1.4[1] R☉ |
| Luminosity | 5.2[1] L☉ |
| Surface gravity (log g) | 4.36±0.14[5] cgs |
| Temperature | 6,856[1] K |
| Metallicity [Fe/H] | −0.20[6] dex |
| Rotational velocity (v sin i) | 45.4±2.3[7] km/s |
| Age | 1.435[5] Gyr |
| Other designations | |
| ψ Tau, 42 Tau, BD+28°619, FK5 2295, HD 25867, HIP 19205, HR 1269, SAO 76461[8] | |
| Database references | |
| SIMBAD | data |
This object is an F-type main sequence star with a stellar classification of F1 V,[3] which indicates it is undergoing core hydrogen fusion. It is about 1.4 billion years old and is spinning with a projected rotational velocity of 45 km/s.[7] The star has 1.6 times the mass of the Sun[5] and 1.4 times its radius.[1] It is radiating 4.8 times the Sun's luminosity from its photosphere at an effective temperature of 7,088 K.[5]