I was unaware of that paper until your post (BTW thanks!) and due to my CCD camera being serviced in the USA at the moment.....
....put this odd thing called an eyepiece (TeleVue Nagler) on the end of my RC16 and had a gander at Eta last week....it had been a couple of years since I observed it visually.
My first thought was "Hummm... Eta looks brighter! "
Seems I was not imagining the change in appearance.
Eta going supernova in the next few years would however be way cool!
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