Just been doing up the A&S sky diary for May and came across this comet. Current predictions suggest a mag of between 4 and 6 when it comes closest to earth only 0.0735 AU on May 13th!!
www.aerith.net/comet/catalog/0073P/2006.html
www.ast.cam.ac.uk/~jds/per01.htm#73P
There was some speculation that this comet may not even exist anymore after a breakup when it came to perihelion in 1995 but latest pictures shows its still going strong and brighter than expected. SOme of the fragments from the last perihelion still remain.
www.aerith.net/comet/catalog/0073P/2006-pictures.html
Better still, on May 8th at around 4am. This comet passes just 3.5' from M57. The coma may well occult M57!!!
Martin get yer comet observing coat on, we got a serious contender here!
  