Open the star map

[Kano96]

I want to make a mod that opens the star map when you zoom out as far as possible in map view.

Is there any way to open the star map through lua?
Alternatively, is there any way to switch to the star map tab when the map view is already open?

You can cycle through the map tabs by pressing arrow up, but I haven't found a way to do this in lua or emulate an arrow up button press. That would be pretty janky anyways.