Thanks Gary, good to know we may have some warning of impending impactors.
I have managed to image a few close approach NEO's (up to mag 16) and used to wonder why I could record the trail of some, but found others difficult, based on their closeness and relative passing speed.
Having read the article, I now suspect the more difficult ones were less reflective, so it looks like I need to image in IR, if only I could find a high enough mountain near Brisbane.
Cheers
Dennis