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Battlestar Location Guide (Season 8 / Week 1)
The Season 8 Week 1 secret Discovery Battlestar can be found on top of the tower next to the ship at Lazy Lagoon.
To actually get the Battlestar to appear though, you first need to complete one full set of any of the weekly challenges (weeks 1-10).
Once any set of them have been completed, this secret Battlestar can be collected and the challenge "Find the Secret Battlestar in Loading Screen #1" will appear in the Discovery Challenges. It will reward you with one full battle pass tier.
Completing 55 weekly challenges will unlock the secret Discovery skin.