No worries Chris, the old planetarium proggies are a god send arent they!
(I know theres good virtual/java online ones to from memory)
I have to say I am reading some wildly varying estimates on their brightness - some say in the 7's even 8's! some even high 5's still - so all i will say is they are the biggest and best damn 7th/8th magnitude (binocular ) comets I have ever seen, particularly through all that moonlight and LP!
interesting!