8 BILLION YEAR OLD PHOTONS in Chris's Backyard Astronomy A blog by Owmuchonomy in General Posted January 24, 2017 On 1/22/2017 at 19:47, John said: Very nice read Chris I managed to catch CTA 102 visually as well just before Xmas. Prior to that my most distant object was a "mere" 4.5 billion LY's ! I believe CTA 102 is still around mag 13. Hi John Thanks for your comments. A snapshot below that I constructed at the time from AAVSO shows how quickly the variability changes. It was noticeably different using subjective visual observations an hour apart. I think its incredible we can do this from our backyards.