There are 9 different constellations to find in the game, three in each galaxy. The following video shows each location.
Timestamps
0:00 - Moogle (Starlight Way)
0:47 - Bomb (Starlight Way
1:24 - Cactuar (Starlight Way)
1:58 - Imp (Misty Stream)
2:38 - Tonberry (Misty Stream)
3:32 - Endymion (Misty Stream)
4:17 - Ultro (The Eclipse)
4:41 - Omega (The Eclipse)
5:56 - Bismarck (The Eclipse)
https://www.youtube.com/watch?time_continue=58&v=dEmQqJc...