On this european space agency photo that takes pictures on a different premise not brightness...
You can clearly see the comet is beyond healthy!!!!!!
https://twitter.com/cosmos4u/status/406175029932478467/photo/1/large
I don’t know, seems it’s tail should be streaming much more than it is, if it still had much ice left. Perhaps its speed is a factor. More time will tell as it leaves the sun. I’m still leaning toward a packet of heavy element debris and little snowball left. ;)
That’s a good pic.