Cotton+ have discovered that “Deneb is a Large Amplitude Polarimetric Variable” - it’s very rare that something new is found out about a named star, but this shows that you just never know…very cool! Observations were taken with the HIPPI-2 and PICSARR polarimeters 🔭🪐 #astrodon

Graph showing the change in brightness of Deneb as seen by the TESS satellite, and the measured linear polarizations. The polarization seems lagged behind the optical variability.
Matthew Kenworthy @kenworthy