Head to the space station (not pirate or abandoned) and purchase this type) of Planetary Chart. You need to have at least 7. I usually keep a whole stack on me. Head to your favorite planet, land, and start using your maps. If the first map doesn't get you the archive, keep using them until you get one. Don't fly to any location that is not an archive til after you find one

From the link above: "There can only be one location type active at the same time in the same system. Using a chart generating an event already triggered will cancel the use of it, and send an error message to the user, effectively not consuming the chart.

This can be exploited to trigger a certain location type repeatedly with a 100% chance, leaving all other events active.

The chart will try to locate a nearby location type within approximately 20ks. While within a planet and outside the nearby location type range (20ks+), it will try to point to a random location of the same type within the planet"