Changes

Willem Janszoon Blaeu (a [[Dutch]] astronomer) was the first person to notice the existence of a new star on August 18, 1600.<ref name=aavso>{{cite web|url=https://www.aavso.org/vsots_pcyg|title=P Cygni

Willem Janszoon Blaeu (a [[Dutch]] astronomer) was the first person to notice the existence of a new star on August 18, 1600.<ref name=aavso>{{cite web|url=https://www.aavso.org/vsots_pcyg|title=P Cygni

|accessdate=December 29, 2021|publisher=aavso.org|author=Matthew Templeton}}</ref> It appears at the third [[star magnitude|magnitude]] for several years before fading to below unaided eye visibility. However it returned to its former brightness in 1626 as well as 1655. Since the 1670s, it has been just about visible to the unaided eye with a magniutde of five, though dark skies are required. The star was named by [[Johann Bayer]] using his standard [[Bayer designation|designation method]].

|accessdate=December 29, 2021|publisher=aavso.org|author=Matthew Templeton}}</ref> It appears at the third [[star magnitude|magnitude]] for several years before fading to below unaided eye visibility. However it returned to its former brightness in 1626 as well as 1655. Since the 1670s, it has been just about visible to the unaided eye with a magnitude of five, though dark skies are required. The star was named by [[Johann Bayer]] using his standard [[Bayer designation|designation method]].

==Properties and Structure==

==Properties and Structure==