Iota Tauri
Double star in the constellation Taurus
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Iota Tauri, Latinized from ι Tauri, is a white-hued star in the zodiac constellation Taurus and an outlying member of the Hyades star cluster.[9] It is visible to the naked eye with an apparent visual magnitude of 4.62,[2] and is located at an estimated distance of about 173 light years based upon parallax measurements.[1] The star is moving away from the Sun with a radial velocity of +38 km/s.[5]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 05h 03m 05.74725s[1] |
| Declination | +21° 35′ 23.8627″[1] |
| Apparent magnitude (V) | 4.62[2] |
| Characteristics | |
| Spectral type | A7 V[3] |
| U−B color index | +0.15[4] |
| B−V color index | +0.16[4] |
| Astrometry | |
| Radial velocity (Rv) | +38.30[5] km/s |
| Proper motion (μ) | RA: +68.88[1] mas/yr Dec.: -41.06[1] mas/yr |
| Parallax (π) | 18.88±0.30 mas[1] |
| Distance | 173 ± 3 ly (53.0 ± 0.8 pc) |
| Absolute magnitude (MV) | 1.00[2] |
| Details | |
| Mass | 2.22[6] M☉ |
| Radius | 2.6[7] R☉ |
| Luminosity | 36[6] L☉ |
| Surface gravity (log g) | 3.97[8] cgs |
| Temperature | 8,054[6] K |
| Metallicity [Fe/H] | +0.15[2] dex |
| Rotational velocity (v sin i) | 131[6] km/s |
| Age | 717[8] Myr |
| Other designations | |
| ι Tau, 102 Tauri, BD+21°751, FK5 184, GC 6158, HD 32301, HIP 23497, HR 1620, SAO 76920, WDS J05031+2135AB, GSC 01293-02747 | |
| Database references | |
| SIMBAD | data |
This has been reported as a double star with two components at separation 0.1", both of type A7V and magnitude 5.4.[10][11] The combined spectrum matches a stellar classification of A7 V,[3] which would normally indicate an A-type main-sequence star that is generating energy through hydrogen fusion at its core. It has an estimated age of 717[8] million years.