The Most likely Naked Eye Supernova
ETA Carina. (10h 45m 03.591s / −59° 41′ 04.26″) It is believed that before Western Sailors ventured south enough to see Eta Carina, once called Eta Argus, that is was the brightest star in the sky as seen from Earth, perhaps as bright as magnitude -4.3, however, since it was discovered by Western astronomers and