From my link:
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At 600+ light years, a supernova would be pretty bright, but hardly bright enough to be a second Sun, as both article say. Sorry, no Tatooine-like sunsets for us. It wouldn’t even be as bright as the full Moon, really, but certainly far brighter than Venus. Enough to cast a shadow, which would actually be pretty cool.
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Also, no, our sun will not go supernova. It does not contain enough mass. It will go into a red giant phase and then eventually become a white dwarf.