# What is the maximum mass of planet HD 40307 g

Recently discovered planet HD 40307g around HD40307 Star system is claiming that its inside a habitual zone of a solar system. Besides It has water where life could be evolved.

I tried to calculate g of that planet. But failed!

This is because the true mass of the planet could not be found. What we have is Minimum Mass which is 7.1 times Earth mass. My question is how do I know the Maximum Mass?

-

The problem is that we don't know the orientation of the system relative to us. The system has been analysed by measuring the motion of the star in the direction towards and away from us. For some planetary mass $M$ we'll see the biggest star motion if we're looking at the system edge on, because in that orientation the planet pulls the star directly towards us and directly away from us as it revolves around the star. If the plane of the system is tilted with respect to us we'll see a smaller stellar motion, and if the system is at 90 degrees to us we wouldn't see any stellar motion at all no matter how big the planet's mass was.