You can track it live here:

https://helldiverscompanion.com/#hellpad/planets/meridia

Days to SE = <Dist to SE in SU> / (<Speed in SU/h> * 24)

Also as of posting, it appears to be slowly slowing down, currently the accumulation rate is 1.00% per hour and the natural decay at this moment is 1.10% per hour, so there is a net decay of 0.10% per hour, but that doesn’t mean we can let any worlds fall into the hands of the Illuminate cult.