90 Tauri
A-type main-sequence star in the constellation Taurus
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90 Tauri (90 Tau) is a star in the zodiac constellation of Taurus,[10] located 144 light-years away from the Sun.[1] It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.27.[2] 90 Tauri is a member of the Hyades cluster and is listed as a double star.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 38m 09.46166s[1] |
| Declination | +12° 30′ 38.9918″[1] |
| Apparent magnitude (V) | 4.27[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A6 V[4] |
| U−B color index | +0.11[5] |
| B−V color index | +0.12[5] |
| Astrometry | |
| Radial velocity (Rv) | 40.30±1[6] km/s |
| Proper motion (μ) | RA: 102.40[7] mas/yr Dec.: −15.78[7] mas/yr |
| Parallax (π) | 22.6374±0.3453 mas[1] |
| Distance | 144 ± 2 ly (44.2 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.18[8] |
| Details | |
| Mass | 2.09±0.11[9] M☉ |
| Radius | 2.8[9] R☉ |
| Surface gravity (log g) | 3.88±0.10[9] cgs |
| Temperature | 8,130[9] K |
| Rotational velocity (v sin i) | 89[4] km/s |
| Other designations | |
| c Tau, 90 Tau, BD+12°618, FK5 2342, HD 29388, HIP 21589, HR 1473, SAO 94044[10] | |
| Database references | |
| SIMBAD | data |
This is an A-type main-sequence star with a stellar classification of A6 V.[4] It has 2.1 times the mass of the Sun and 2.8 times the Sun's radius.[9] An orbiting companion was announced in 2014. This is probably a spectral class K4V star with an estimated orbital period of at least 84 days. The primary is being orbited by a debris disk.[11]