The first three Winking Cat Treasure Hunt challenges expire tomorrow. You will need an SRV hangar, a DSS (Detailed Surface Scanner) and whatever FSD you can afford. Land at the crash/cache sites and scan them with your SRV for the rewards. See u/Cmdr-Owl's for details. Be sure to read the FAQ portion before you start out. You can also read a bit more background
Tomorrow the first three caches expire, reducing awards to 120M and one free ship. The second three will last another week before expiring.
One final note about Mitterand Hollow: this moon orbits fast – really really fast. So fast that catching up to it in supercruise is difficult. Approach from in front of the moon and let it come to you. See to see how. Even if you are moving slowly you may be forced out of supercruise and will take a small amount of damage – you'll just need to re-enter supercruise now that you are in the moon's sphere of influence to scan it and find the right crash site. Just be sure to get that repaired before proceeding to the next cache.
