18 Tauri
Star in the constellation Taurus
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18 Tauri is a single[9] star in the zodiac constellation of Taurus, located 452 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.66.[2] The star is moving further from the Earth with a heliocentric radial velocity of +4.8 km/s.[5] It is a member of the Pleiades[10] open cluster, which is positioned near the ecliptic and thus is subject to lunar occultations.[11]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 45m 09.74013s[1] |
| Declination | +24° 50′ 21.3432″[1] |
| Apparent magnitude (V) | 5.66[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B8 V[4] |
| B−V color index | −0.064±0.012[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.8±0.8[5] km/s |
| Proper motion (μ) | RA: +20.218[1] mas/yr Dec.: −46.124[1] mas/yr |
| Parallax (π) | 7.2222±0.0551 mas[1] |
| Distance | 452 ± 3 ly (138 ± 1 pc) |
| Absolute magnitude (MV) | 0.19[2] |
| Details | |
| Mass | 3.34±0.06[3] M☉ |
| Radius | 2.89[6] R☉ |
| Luminosity | 160+18 −15[3] L☉ |
| Surface gravity (log g) | 4.126±0.113[7] cgs |
| Temperature | 13,748±223[7] K |
| Rotational velocity (v sin i) | 212[3] km/s |
| Age | 204[1] Myr |
| Other designations | |
| 18 Tau, BD+24°546, GC 4485, HD 23324, HIP 17527, HR 1144, SAO 76137[8] | |
| Database references | |
| SIMBAD | data |
This is a B-type main-sequence star with a stellar classification of B8 V,[4] and is about halfway through its main sequence lifetime.[3] It displays an infrared excess, suggesting the presence of an orbiting debris disk with a black body temperature of 75 K at a separation of 137.8 AU from the host star.[6] The star has 3.34[3] times the mass of the Sun and 2.89[6] times the Sun's radius. It is radiating 160[3] times the Sun's luminosity from its photosphere at an effective temperature of 13,748 K.[7] 18 Tauri has a high rate of spin, showing a projected rotational velocity of 212 km/s.[3]