Updating the light visual curve pre-perihelion of comet C/2009 R1 McNaught based in 121 visuals magnitudes from International Comet Quaterly , international observers of comets lists of yahoogroups.com CometObs , and spanish lists observadorescometas , the preliminar analysis of author show the discovery of 2 outburts , T ~ 30 days before from perihelion d(m1) = +0.8 magnitudes , and
d(m2) = +0.6 magnitudes , the comet show 'brakes' ~ 18 days from perihelion and the maximum magnitude +5.0 . The comet have 3 three laws photometricals , the next power's law n1 = 8.3 , n2 = 10.1 , and n3 = 1.0 .
