Solar analogues are fundamental targets for a better understanding of our Sun and our Solar System .
Usually , this research is limited to field stars , which offer several advantages and limitations .
In this work , we present the results of a research of solar twins performed for the first time in a open cluster , namely M67 .
Our analysis allowed us to find five solar twins and also to derive a solar colour of ( B - V ) _ { \odot } = 0.649 \pm 0.016 and a cluster distance modulus of 9.63 \pm 0.08 .
This study encourages us to apply the same method to other open clusters , and to do further investigations for planet search in the solar twins we find .