Well, it's not unheard of to refer to location as what constellation a star is in-- "over in the Vulpeculae stars" is where the Orz live, for example.

My home world was a secret, which is why no-one knew to look for it when my parent's ship got stuck there. I understand the not-well-known bit, believe me.

Sol III is Earth, actually. Third planet out from the star called Sol. Unzervalt is "Vela I" because it's the closest planet to the star Vela. :) There's also an alpha/beta/gamma/delta (and so forth) for stars in the same constellation-- so there's multiple stars called Vulpeculae, each with an alpha or beta or whatever before it.