Analysis of BAT99-123's spectrum reveals a surface temperature of 170,000 K. Assuming a distance of 50.12 kpc, or about 163,500 light years, BAT99-123's luminosity is about , corresponding to a radius of . BAT99-123's strong stellar wind, which has a very high
terminal velocity of 3300 km/s, causes it to lose 10−5.14 M☉ (about ) a year. WO-type Wolf-Rayet stars are very very close to the end of their lives. BAT99-123 is predicted to explode in a
type Ic supernova in about 7,000 years. By then, it's predicted to have a mass of 7.7 M☉, much lower than its initial mass which was likely a few dozen solar masses. It likely has a similar mass right now as its stellar wind will not change the mass much in this timescale. == References ==