1. The problem statement, all variables and given/known data In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital radius of such a planet is found to be 4.9 1011 m, with a period of 1280 days. Find the mass of the star. 2. Relevant equations T^2=4pi√((r^3)/Gm)) 3. The attempt at a solution (1280)^2=4pi√((4.9E11)^3/(6.67E-11)m) 1638400=4pi√((1.17649E35)/(6.67E-11)m) 1286796.351=√((1.17649E35)/(6.67E-11)m) 1.655844849E12=(1.17649E35)/(6.67E-11)m) 110.4448514m=6.67E-11 m=6.039E-13 I thought this was the right solution; however, I am not getting the correct answer as I am doing it online and it tells me I am doing it wrong. Am I using the wrong equation?