Corona Borealis

"There was the constellation of Corona Borealis, but in the ring of the Corona, the second star down was bright - very bright," he explains.

The outburst will be visible in the constellation Corona Borealis and will be as bright as the North Star for about a week before fading, according to Space.com.

It states the length and breadth in degrees of the constellation Corona Borealis, the northern crown, and gives coordinates for the stars at its extreme north, south, east and west.

The remark apparently refers to the “Blaze Star” of 1866 in Corona Borealis, which was known previously as a star of about the 9th magnitude before its sudden outburst on May 12 of that year.

A very interesting temporary star—known as the "Blaze Star"—suddenly appeared in Corona Borealis in May, 1866.