2012s1 20130423 james

 Focas gives a 20x20 arcsec mag of 15.65  
using CMC-14. The absolute mag has been stuck at around 12.5 since it  
passed log(r) = 0.72 (i.e. 5.2 a.u) and it is now just inside 4au. 
20130423 Nick James