The formula for determining the force that the earth and YU55 will exert on each other is determined by the formula found at http://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gravitation. they are related to the mass of the objects divided by the distance between them squared. The mass of YU55 is 60,627kg, the mass of the moon is 73,470,000,000,000,000,000,000kg, so you can see that YU55 will be very small compared to the moon. I hope this clears any misunderstanding about this. It will be interesting how close this object will be to the moon in November. As for Elenin I do not know the mass of this object.
"Hi Dru......If the moon affects our tides than how is this asteriod or comet that is going to pass by closer than our moon not going to effect something?"
I had the same question, as you, after reading the news headline myself; which I'm posting again below for those that may have missed it over the weekend. Like you, I find it hard to believe that the scientists think that this asteroid will have little to no effect on Earth at its closest encounter with us. Hmm, perhaps this is coming from the same "experts" claiming that Comet Elenin is having no effect as well. Check out this video on Elenin which proves otherwise:
And here's the news headline regarding the asteroid that I posted over the weekend:
Jesus is coming soon!