Look up! A once-in-a-lifetime explosion is about to create a 'new' star in the sky

T CrB, a white dwarf in Corona Borealis, 3,000 light years away, will erupt soon with a magnitude 2.5 brightness due to a thermonuclear reaction. Drawing gas from a red giant, it formed an accretion disc and entered a high state in 2015. Both amateur and professional astronomers await this rare midnight sky event.