Astronomical photographic plates enable time domain science, including searches for transiting #exoring systems such as #J1407b, so I was happy to see Enke+ “Archives of Photographic PLates for Astronomical USE (APPLAUSE)" that includes a light curve for Boyajian’s star #astrodon 🪐🔭

Light curve of Bojajian's star, showing no variability from 1920 to 1980.Inverted photos of white on black images of GK Per, showing the expansion of a shell of ejected material over 1914 to 1953.

Matthew Kenworthy @kenworthy