This explains why it is so hard to see. I came across this assertion in a youtube video and then went looking. There are other references to it as well. Seen from STEREO Ahead it looks crescent shaped. But it’s moving. Pictures tell it best.
September 20th – Bright
(dark is overly bright and the color is inverted)
September 25th – again Bright
There’s another phenomenon on October 2nd but I don’t know what it is.
And please go looking for the references to this dark star being a Neutron Star. They exist.