The wiki links seem to say that they expect the supernova to register at -12.5 apparent magnitude. The sun has an apparent magnitude of -27, and the full moon h

The wiki links seem to say that they expect the supernova to register at -12.5 apparent magnitude. The sun has an apparent magnitude of -27, and the full moon has an apparent magnitude of -12. So the supernova will first appear as a single dot approximately as bright as a full moon hanging in the sky. I don't know how large the explosion will appear, but the article on the Crab Nebula (https://en.wikipedia.org/wiki/SN_1054 https://en.wikipedia.org/wiki/SN_1054) which was probably observed by Chinese (and other) astronomers in has some descriptions, as well as a simulated image of the skyscape the astonomers may have seen. SN 1054 was estimated to have an apparent magnitude of -6, so like 250 times dimmer than they think Antares will be.