I saw the video, but couldn't tell the scale/size of the rocks. Has anyone overlayed a scale on the photos?
At what angle was the asteroid hit? Probably not head-on, but was it a front quarter or rear quarter or just a t-bone?
I haven't seen an overlay. I was watching live on the NSF youtube feed, and they had a few NASA mission leads on during it. I got the impression that the final two images we were looking at a resolution of under a foot per pixel. The entire object is around 160 meters across, and as the impactor is closing on it during the last 30 seconds you can see solid protrusions that are a good 5-10 meters in size. Spitballing, I'd guess the final full image sent prior to the partial red image, the rock in the center was 3-5 meters across? Andy Cheng suggested it was somewhere between 5-10cm per pixel on the final full image, but we don't know the resolution of the images themselves.
I have read one PDF that suggests it is 2560 x 2160 pixels. Cheng went on to say the final rocks were beach ball sized, or you could hold in your hands.
We won't know the momentum impact for a few days probably. Cheng suggested it was an incredibly square impact to the center of the target. No word on if the visual center of the target corresponds to the center of mass of it. Density differences could cause funkiness.