| − | </ref><ref>{{cite web|url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=KY+Cyg|title=KY Cygni|accessdate=July 28, 2020|publisher=sai.msu.su}}</ref> As an irregular variable star, it does not vary in brightness with any discernable period. | + | </ref><ref>{{cite web|url=http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=KY+Cyg|title=KY Cygni|accessdate=July 28, 2020|publisher=sai.msu.su}}</ref> As an irregular variable star, it does not vary in brightness with any discernible period. |