I wondered if I could identify that prominent prominence! In the figure below, I used my last image before totality (A) where sunspots were still visible (yellow arrow) I aligned my image with the SOHO sunspot image of 8-21 (sunspot 2672 specifically) (B). The totality image was then rotated to the same degree as my sunspot image. I then looked at the SOHO EIT304 (extreme ultraviolet image in He II, 304 Å) which shows prominences(C and D). The EIT304 images from 8-21 show a persistent prominence (red arrow) at the location of the most prominent one visible during totality (F).