This blue light is in the night sky in Denmark right now. No blue comet should be visible at the moment, and the perseids and Kappa Cygnids look really different. Apparently many
Kappa Cygnids - American Meteor Society
Kappa Cygnids – Meteor Section
Meteor Showers Tonight - Posts | Facebook
kappa-Cygnid - Sky & Telescope - Sky & Telescope
Kappa Cygnids - American Meteor Society
Taurid meteors may produce dazzling 'fireballs' | New Scientist