139 Tauri is a single,[11] blue-white hued star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of 4.81.[2] The distance to this star, as determined from an annual parallax shift of 2.10±0.19 mas,[1] is roughly 1,600 light years. Because this star is located near the ecliptic, it is subject to occultations by the Moon. One such event was observed April 28, 1990.[12]
This is a massive B-type lower-luminosity supergiant or bright giant star with a stellar classification of B1 Ib[3][4] or B0.5 II,[5] respectively. It is around 22.5[3] million years old with a high rate of spin, showing a projected rotational velocity of 140 km/s.[9] J. D. Rosendhal (1973) identified weak emission features associated with an asymmetric H-alpha absorption line, providing evidence of mass loss.[13] The star has about 10[3] times the mass of the Sun and around 20[8] times the Sun's radius. It is radiating over 80,000[8] times the Sun's luminosity from its photosphere at an effective temperature of around 24,660 K.[4] Stars such as this with 10 or more solar masses are expected to end their life by exploding as a Type II supernova.[14]
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