Q: Correct your value for the observed semi-major axis for this inclination. What is the new semi-major axis? observed a true a = ------------------ cos (31 degrees) 14 AU = ---------- = 16.3 AU 0.857 Q: Use the corrected semi-major axis to compute the mass of the stars in the Procyon system. How does it compare to your previous mass estimate? 3 (semi-major axis in AU) total mass (solar) = ------------------------- 2 (Period in years) (16.3 AU)^3 = ----------- = about 2.6 solar masses (41 yr)^2