As per the title says I need to know what Jin's artifact can actually do, I am aware that he's able to use it to teleport away, what I want to know is where can he actually teleport?. 

At first I assumed that he could teleport to places he'd seen before but apparently that isn't true, Tohma says "Our Captain's artifact can only be used to move places he can see". This is probably true because in the first Episode when MC nearly falls he opens a rift and takes her to the Helicopter which was in his line of sight despite being in the air. 

I know that I basically answered my question but it still baffles me, I want to know its exact limitations. Because if he can teleport to places he can see, can he hypothetically teleport to the moon? I mean he can see it if he looks at the night sky. It could also mean if he uses a telescope he can teleport to planets that now is in his line of sight, and if he sees a place through a camera or a video can he teleport there or does it literally have to be something he can see?. 

Also another detail to add, based on these facts when he teleported away from Ritsu in their Campus Moment does that mean he teleported outside?. When I first saw the moment I assumed he teleported to his room but that can't be true because even if his room was in sight, he wouldn't be able to teleport inside since he can only see the door not the inside of the room. He couldn't have been in Ritsu's line of sight either because then Ritsu would just catch up to him so the only way he could've left was through the window in the back which shows what was outside hence making it a place Jin sees and somewhere he can teleport to. 



How does Jin's Artifact Actually Work?