From JPL website about YU55...
"Since the asteroid(YU55)will approach the Earth from the sunward direction, it will be a daylight object until the time of closest approach. The best time for new ground-based optical and infrared observations will be late in the day on November 8, after 21:00 hours UT from the eastern Atlantic and western Africa zone. A few hours after its close Earth approach, it will become generally accessible for optical and near-IR observations but will provide a challenging target because of its rapid motion across the sky."
and here is a video about YU55 it debunks Elenin and Honda as potential earth collisions.

[youtube] [link to youtu.be]

thanks for the information on Elenin's size everyone. I am still looking at dates and proximity to each other as far as these 4 objects go and haven't really come to any conclusions yet...
I am not a scientist...but I play one on the internet...so whatever I come up with won't be a smoking gun...just an opinion based on the information given.