FW Tau is a binary star system with a gas giant orbiting both of them. The gas giant takes 11421.023 years in Space Engine.

The problem is that both stars orbit each other at wildly different orbital periods. One of them has a orbital period of 24.376 years, while the other is 11421.023 years, exactly the same as the gas giant.

Based on the mass of each star (in which both of them have the exact same mass of 0.28 solar masses, which means the total mass of both stars is 0.56 solar masses) and their distance from each other (which is 11 AU), and based on the link below...

http://hyperphysics.phy-astr.gsu.edu/hb ... istar.html

... I predict that the true value for the orbital period is 48.75228932353551 years. Please note that this is entirely based on the mass, so if the mass turned out to be wrong as well, so is my prediction.