Secret Season 10 Week 9 Battle Star Location Guide - Fortnite Battle Royale
Battlestar Location Guide (Season 10 / Week 9)
To actually get the Battle Star to appear though, you need to complete any 3 of the limited time missions in the "Ready or Not" challenges.
Once you've completed any 3 of the 7 challenges in the Ready or Not Limited Time Missions, this Secret Battle Star can be collected. It will reward you with a Battle Star (one full battle pass tier).
In Season 10 daily challenges have been replaced by these "Limited Time Missions". The Secret Battle Stars are now found each week in this set of missions instead of completing all the weekly challenges each week to get them to appear.