In this work have been investigated and analyzed a total of 17 visual light curves of comets , was calculated with the average coefficient of phase for 17 differents comets , the first report of this type Meech and Jewitt ( 1987 ) obtaining coef. fase = 0.018 mag / deg , the author of this work has had difficulty in calculating this value due to the rotational amplitude of comets usually about 1.1 magnitudes (Belton 1986), this study has found a value of 0.040 mag / deg .
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