The supernova observed by Song-dynasty astronomers in 1054 remained visible even during the daylight hours for 23 days. From the records taken at that time we can calculate the brightness of the exploding star, and we can use its brightness curve to figure out whether the progenitor was a single star or binary system.
一○五四年宋朝記錄的超新星爆炸，持續二十三天白晝可見，由當時記錄也可以推算星體亮度，再以依其光度曲線推算是哪一類型新星？