I am an engineer and my job involves various approaches to manipulating and analyzing data. I have this macro tool i use to interpolate and extrapolate data. So I took the distances of YU55 between Nov 4 - 11 (according to JPL, the close approach data is Nov 9 at 0.0022AU). Therefore, i get the following dataset:

Date Ref App Dist.
4 -5 0.0391
5 -4 0.0312
6 -3 0.0234
7 -2 0.0156
8 -1 0.0079
9 0 0.0022
10 1 0.0085
11 2 0.0162

Then I interpolate a per hour basis. So it looks something like:

Date Ref App Dist.
4 -5 -0.0391
-4.958333333 -0.038770833
-4.916666667 -0.038441667
-4.875 -0.0381125
... ... ...

Now think about this for a second... First of all, over a 7 day period, the trajectories of these two bodies are going to be relatively linear (straight). Therefore, the relative distance between the two will be linear as well (no corealis or angular acceleration or anything like that). Therefore, I should not see any significant disturbances in the data.
Secondly, the day to day distance given by jpl is taken at a 24 hr interval. Everything in between, they interpolate (supposedly just like I did). I compared their hour by hour distance to my interpolated data. All was spot on Until I got to the 8th (day before/of close approach). I observed that their distance decayed much more slowly than mine. So I created the following data. Notice, i applied the use of negative and positive distance to account for distance before and after close approach:

4 -5 -0.0391
5 -4 -0.0312
6 -3 -0.0234
7 -2 -0.0156
8 -1 -0.0079
9 0 0.0022
10 1 0.0085
11 2 0.0162

And came up with this during the course of Nov 8th:

8 -1 -0.0079
-0.958333333 -0.007479167
-0.916666667 -0.007058333
-0.875 -0.0066375
-0.833333333 -0.006216667
-0.791666667 -0.005795833
-0.75 -0.005375
-0.708333333 -0.004954167
-0.666666667 -0.004533333
-0.625 -0.0041125
-0.583333333 -0.003691667
-0.541666667 -0.003270833
-0.5 -0.00285
-0.458333333 -0.002429167
-0.416666667 -0.002008333
-0.375 -0.0015875
-0.333333333 -0.001166667
-0.291666667 -0.000745833
-0.25 -0.000325
-0.208333333 9.58333E-05
-0.166666667 0.000516667
-0.125 0.0009375
-0.083333333 0.001358333
-0.041666667 0.001779167
9 0 0.0022

Which indicates that the close approach distance is actually 0.0000958333 AU at about 7pm.

When I plotted this across the close approach date (9th, or day 0), I saw an odd jink (referenced above by differing distance decay), indicating that the supposed close approach distance (.0022) was further than the distance that the data would indicate IF (0, .0022) was not a 'known' point in the data.
So, I took the same approach, except using this data as reference:

Date Ref App Dist.
4 -5 -0.0391
5 -4 -0.0312
6 -3 -0.0234
7 -2 -0.0156
8 -1 -0.0079
10 1 0.0085
11 2 0.0162

Now things get interesting. According to this data, removing the supposed close approach distance which made me suspicious, the following is what the 8th looks like:

8 -1 -0.0079
-0.958333333 -0.007558333
-0.916666667 -0.007216667
-0.875 -0.006875
-0.833333333 -0.006533333
-0.791666667 -0.006191667
-0.75 -0.00585
-0.708333333 -0.005508333
-0.666666667 -0.005166667
-0.625 -0.004825
-0.583333333 -0.004483333
-0.541666667 -0.004141667
-0.5 -0.0038
-0.458333333 -0.003458333
-0.416666667 -0.003116667
-0.375 -0.002775
-0.333333333 -0.002433333
-0.291666667 -0.002091667
-0.25 -0.00175
-0.208333333 -0.001408333
-0.166666667 -0.001066667
-0.125 -0.000725
-0.083333333 -0.000383333
-0.041666667 -4.16667E-05
9 0 0.0003
0.041666667 0.000641667
0.083333333 0.000983333

Which indicates that the close approach distance is 0.0000416667AU = 3904 miles at about 11pm on the 8th, which is quite about closer than 200,000 miles.

This might not make sense to some. All I am trying to say here is that it appears the JPL data is inconsistent.

Some have asked for some sort of data representation. Here is a basic plot of the two datasets described above. One 'With' (blue) the 0.0022 point included, and the other 'Without' (red) the 0.0022 point included, substituting interpolation. I have done nothing to exaggerate how this data appears. It is what it is. In response to Phage, you can see when looking at such a narrow scope of 1 week, the data should be relatively linear. You can admit that this visual representation of the data indicates adverse manipulations. I apologize for any confusion. The point of this post is indicated in this image. It has little to do with accurate/inaccurate interpolations, but rather the accuracy and integrity of the supposed 0.0022 close approach distance.

x = Days (-6 to 2)
y = Distance (negative prior to close approach, positive after close approach)

EDIT: Okay, I reread it and now I get what you are saying. That is VERY interesting.

It wouldn't surprise me at all if you are correct, because I have a bad feeling about YU55 for some reason. My feeling isn't logical, but your numbers certainly seem to be.

First of all, thanks for that body of work you've posted, but ignorant people like me can't make head nor tails of all those numbers. Is there something visual we could look at? What contintent will it be closest to?

Secondly, who's 11pm? EST, PST, MST GMT?

I do actually understand what you are saying OP, well about 95% of it.

What we would all like to know is, if this is going to get so close to the Earth, will it get "sucked" into us from gravity etc.?

Also, where abouts will it hit the Earth, roughly?

Get this right and you will be as famous as Einstein.

That's really interesting and lot of thinking put into it, I am also an engineer . All I can say is well lets hope your not right or were all doomed. What bugs me is how can astronomers figure out the orbit of a comet or a asteroid so many light years away, like how??? I know they have instrumentation to do so, but still when I think about, this things are so many millions of miles away, how can they figure out the orbit and make a chart based on it, I mean where do they get this much accurate info, I believe, they are hiding a source from the human population, only some know, and some will never know.

Hi.
Too many numbers for my poor brain to keep up with, but I get the gist of what you are saying.

A touch of the "lies and damned lies" with the figures.

I expect that the parallel tracks may in fact be more divergent than figures say, least ways thats what I hope.

Strangely, YU55 was the subject of comment on a Radio4 programme here in the UK on Sunday morning. I will take a look and see if I can find a link.

Things like this tend to get little notice taken of on Radio4 and the idea that it might hit the Earth, well I suppose early Sunday morning and there are not so many listeners.

Anyway, maybe I will just pop into Tesco and get a few extra tins of beans, just in case.

If anything happens, which I rather doubt, good luck everyone.

The big question of the matter is... going by your new data, will it get close enough to the Earth to get caught by our gravity and make an impact?

Thanks for the research OP. I also would like to know where it's most likely to hit if it indeed gets pulled by Earth's gravity !