No offense meant, but if I had seen it there I wouldn't have posted the topic.
I'm mainly asking if I've overlooked it, and if it's not naturally available (as in, it just pops up at some point) how to get to it.
I don't know what you meant by no offense meant but he is asking you if you hit "J" and look under the Available tab you might find it, or maybe your lvl is too low for it so it is not available for you and it doesn't show yet
Hit "J" look under the available tab and look under lieutenant Atonone if it shows there its available for you
You only get the mission after you accept one of the star cluster exploration tutorial missions. As soon as you arrive in the cluster, the dialog window will pop up and you can get the mission from there.
After that it will always be in your available mission window.