Others have pointed out similar predictions for a comet in 1973 that turned out to be much dimmer. I'm not an astronomer but look forward to taking an amateur's stab at it should the predictions prove accurate.
6D, Fuji X-T1, X-E1
Tamron 24-70 2.8 VC, 70-200 f/2.8L IS II, 400mm f/2.8L II, 100mm L IS Macro, Sigma 85mm, & 35mm f/1.4's, Rokinon 14mm f/2.8,
Fuji 23mm 1.4, 35mm 1.4, 56mm 1.2, 14mm 2.8, 18-55, 55-200