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Double star in the constellation Taurus From Wikipedia, the free encyclopedia
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 | |
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.
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