Star in the constellation Taurus
139 Tauri is a single,[ 11] star in thezodiac constellation ofTaurus . It is faintly visible to the naked eye with anapparent visual magnitude of 4.81.[ 2] parallax shift of± 0.19 mas [ 1] light years . Because this star is located near theecliptic , it is subject to occultations by the Moon. One such event was observed April 28, 1990.[ 12]
This is a massiveB-type lower-luminositysupergiant orbright giant star with astellar classification of B1 Ib[ 3] [ 4] [ 5] [ 3] projected rotational velocity of 140 km/s.[ 9] emission features associated with an asymmetricH-alpha absorption line , providing evidence of mass loss.[ 13] [ 3] mass of the Sun and around 20[ 8] Sun's radius . It is radiating over 80,000[ 8] Sun's luminosity from itsphotosphere at aneffective temperature of around 24,660 K.[ 4] Type II supernova .[ 14]
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