Comet C/2009 P1 is displaying a nearly constant Afrho quantity behaviour with a value close to 6500 - 7000 cm in R band for a 20000 km radius window.

Observations are due to Erik Bryssink (Brixiis Observatory- Belgium), Rolando Ligustri (Talmassons Observatory - Italy), Giannantonio Milani (Padova - Italy), Giovanni Sostero, Ernesto Guido and Nick Howes (Remanzacco Observatory and Faulkes Telescope North).