The imminent eruption of the star T Coronae Borealis (T CrB) has been anticipated for months, with its last occurrence dating back to the 1940s. This thermonuclear detonation on its surface happens approximately every 80 years, making it visible without any aid. The best view of this event will be from London, looking south-south-west around 2300 BST. It is recommended to keep an eye on this location when it occurs.
Despite our anticipation, the actual explosion of the star has already taken place. T CrB is located about 2,600 light years away, which means that the light we are eagerly awaiting exploded from the star approximately 2,600 years ago and has been traveling through space ever since. The wait is almost over as we are now only a matter of weeks or even just days before witnessing this remarkable event.
For observers in Sydney, Australia, the constellation will be most visible when at its highest point, which is due north at around 2100 AEST. This presents a unique opportunity to witness this rare celestial event and savor the moment when the light from the eruption finally reaches us after its long journey through space.
The Astronomical League advises making a sketch of the constellation now and then another when the star erupts. Drawing the constellation now will assist in determining the exact day when the light from the eruption arrives at Earth.