@property<EOL><INDENT>def RV_3(self):<DEDENT>
return -self.orbpop_long.RV * (self.orbpop_long.M1 / (self.orbpop_long.M1 + self.orbpop_long.M2)) +self.orbpop_short.RV_com2<EOL>
Instantaneous RV of star 3 with respect to system center-of-mass