Topline
If predictions come true, June 25 could see a dim star in the night sky suddenly brighten in a once-every-80-years event. The star, called T Coronae Borealis (T CrB) and nicknamed the “Blaze Star,” is a recurrent nova located about 3,000 light-years from the solar system in Corona Borealis, a crescent-shaped constellation now visible. Here’s exactly how to find it in the night sky.
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How To Find The ‘blaze Star’
The nova will appear within the boundaries of Corona Borealis, a distinctive crescent-shaped constellation located between the constellations Boötes and Hercules. A simple way to locate it is to find the Big Dipper and follow its handle to Arcturus, one of the brightest stars in the sky. Then locate Vega, the brightest star in the Summer Triangle asterism, rising in the eastern sky. Corona Borealis lies roughly halfway between these two prominent stars. Within Corona Borealis, T CrB will appear close to Epsilon Coronae Borealis, just outside the constellation’s arc of seven stars. If there is no outburst in June, the next most likely date is Feb. 8, 2027, according to the paper’s authors. That would be bad news since Corona Borealis is in the daytime sky at that time of year.
What Will Skywatchers Actually See?
The prospect of a “Blaze Star” appearing in the night sky has generated considerable excitement, but the event is likely to be subtler than many expect. When T Coronae Borealis erupts, astronomers estimate it will brighten to around magnitude +2 or +3, making it similar in brightness to stars such as Polaris (the North Star) and Mizar in the Big Dipper.
That will be bright enough to see with the naked eye, particularly in dark locations, but it will not rival the brightness of the brightest stars or planets. The real attraction is the transformation itself. A star that is normally invisible without a telescope could suddenly appear where no obvious star existed before.
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Why Astronomers Are Watching So Closely
T Coronae Borealis is a recurrent nova — a rare stellar event in which a white dwarf undergoes a powerful thermonuclear eruption on its surface. The star system consists of a red giant star and a white dwarf locked in a close orbit. Gas flowing from the expanding red giant gradually accumulates on the white dwarf until conditions become extreme enough to ignite a runaway nuclear reaction. The resulting outburst causes the system to brighten dramatically before fading over the following days and weeks.
Interest in T Coronae Borealis intensified after astronomers observed an unusual dimming event in 2023 and 2024 that appeared similar to behavior recorded before the system’s last eruption in 1946. Those observations led some researchers to suggest the nova could occur between April and September 2025. Although that window passed without an eruption, T Coronae Borealis remains one of the most closely watched stars in the night sky.
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Further Reading
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