Hmm. If you have perfect information as per the wikipedia article, the the most rational thing to do is to not take part in this auction at all. By placing a single bid, you are led into a series of rational sequential bids, leading to irrational bids subsequently. You know this in advance, so any bid is irrational.
In saying that ...
0.5112 btc 
It's like being in Alice In Wonderland. Your 5.1112 bid obviously doesn't fall into the definition of acceptability, so you aren't on the hook, sir.
38 minutes to go..
