The eruption of the star T Coronae Borealis (T CrB) is imminent, and we are eagerly anticipating it. This thermonuclear detonation on its surface occurs approximately every 80 years, making it visible without aid for the first time since the 1940s. Although we have been anticipating this event for months, it has already occurred. 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.
For observers in London, the best view of the event will be looking south-south-west around 2300 BST. It is recommended to keep an eye on this location when T CrB erupts. When it does erupt, it is expected to shine as brightly as Alphecca, the brightest star in the constellation of Corona Borealis, also known as the northern crown.
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. However, despite our anticipation, we must admit that we have already missed out on this remarkable celestial event. The actual explosion of T CrB occurred weeks ago, and now all we can do is wait for its light to reach us after its long journey through space.
For observers in Sydney, Australia, they will get a chance to witness this rare celestial event when it reaches its highest point due north at around 2100 AEST. Take this opportunity to savor this moment and appreciate how far away stars can be while still impacting our lives in such a significant way.