A New Star Will Soon Appear In The Sky — All About T Coronae Borealis

A drawing star map pointing T CrB in Corona Borealis with a red pencil
Have you heard about the nova? Called T Coronae Borealis, also known as T CrB or the 'Blaze Star,' this very dim point of light in the eastern night sky after dark is set to dramatically brighten sometime in 2025.
When it does, it will become visible to the naked eye for the first time since 1946 and for the last time until about 2105. A 'recurrent nova" — a star system that brightens briefly every 80 years or so — it's the only one of its kind that does so within the span of a human lifetime. However, unless you know what you're looking at and how to find it, you'll likely miss it.
Here's everything you need to know n about T Coronae Borealis, in numbers:
T Coronae Borealis is to stars — an expanding red giant star and a small, dense white dwarf star. As it expands, the former is spewing hydrogen onto the latter's surface. When the temperature of the white dwarf reaches around 18 million degrees Fahrenheit (about 10 million degrees Celsius), there's a thermonuclear explosion — and a new star in the sky for a few days. Crucially, the white dwarf is not destroyed, and the 80-year-long process begins again.
That's how far away this event will take place. Although the star will seem to erupt in real-time, the explosion happened around 3,000 years ago. Traveling at light speed, it takes that long for T Coronae Borealis' light to reach us. It's the same for all stars — even the sun's light is eight minutes old. Everything you see has already happened — including the thermonuclear flash on T Coronae Borealis.
That's how long it's been since the last eruption in 1946. Before that, it was 1866 — we have the records from previous generations of astronomers. Of course, the fact that it's 3,000 light-years distant means it's almost certainly undergone a further 37 thermonuclear explosions, the light of which is on its way to us.
A red giant star and white dwarf orbit each other in this animation of a nova similar to T Coronae ... More Borealis. T
T Coronae Borealis lies just outside Corona Borealis, a small, crown-shaped arc of seven stars whose name translates to Northern Crown. It's a small and little-known yet beautiful constellation in the Northern Hemisphere. The exact location of T Coronae Borealis is just outside the curve of stars, close to faint Epsilon Coronae Borealis. Find it now so you'll notice the sudden change when it does "go nova."
To find Corona Borealis, start with orangish Arcturus in the constellation Boötes and Vega in Lyra — two of the five brightest stars in the entire sky — and look in between for the constellation Corona Borealis. Look east about an hour after dark, and you'll see it as a crescent.
When it does flash, T Coronae Borealis will leap from +10 magnitude — which is beyond human sight — to +2 magnitude. That's about the same brightness as Polaris, the North Star, the 48th brightest star in the night sky. T Coronae Borealis will be visible to the naked eye for a few nights.
Wishing you clear skies and wide eyes.

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