I have used P^2=(4*Pi^2*a^3)/(G*M) to calculate semimajoraxis a, with P=12.062 yr and M=18348*10^6*M_SUN. But z=0.306 From 2014 Thesis of Pihajoki P. University of Turku, ser. A1 - 492. Annales Universitatis Turkuensis. If I would take this redshift into account should I recalculte all by P=12.062yr/(1+0.306)=9.235834609 yr? (I use not rounded numbers. Hannu