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T Coronae Borealis nova could become a 'new star' in the sky any day now, and will be as bright as the North Star
A star system 3,000 lightyears away is set to become visible to the naked eye this year, in an event that will see its apparent brightness temporarily increase.
T Coronae Borealis, also known as T CrB, last brightened in 1946, and astronomers have predicted it could brighten again between now and September 2024.
This brightening event is known as a 'nova', which means 'new star' in Latin, so-called because it describes how a previously dim star can suddenly reach prominent naked-eye brightness in the sky.
What the T Coronae Borealis nova will look like
Star system T Coronae Borealis normally shines at a brightness of magnitude +10, which is the measurement astronomers use to describe the relative brightness of one celestial object (i.e. how bright its appears from Earth) compared to others.
On the magnitude scale, the higher the number, the dimmer the object. Sirius, the brightest star in the night sky, has a magnitude of -1.46, for example.
The full Moon has a magnitude of about -13.
T Coronae Borealis is expected to jump to magnitude +2 during the nova event, which would make it similar in brightness to the North Star, Polaris.
It could be visible to the naked eye for several days and potentially visible for over a week through binoculars.
It will then dim again and could remain so for another 80 years, making this a potential once-in-a-lifetime astronomical event.
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https://www.skyatnightmagazine.com/space-science/t-coronae-borealis-nova
https://www.astronomy.com/observing/how-to-see-t-coronae-borealis-the-brightest-nova-of-the-generation/