Stands to reason there are more than just the Angara, Jaardan, their arch-enemies, and Kett in Andromeda. Talk to a certain Salarian and you'll get some background on at least a couple other leads. It is *somebody's* satellite.
Bioware should have known we would do this, analyze their story for inconsistencies and clues, to try and answer the many, many unanswered questions they decided to include. Hard to decide what is important, what isn't, and what was just oversight or fast and loose with the details on their part. It is a brand new galaxy and there is no end to what we don't know at this point.
I'll jump straight to eleven then for you.👿 I think the satellite belongs to the benefactor, which is actually the Jaardan, which also created every race in the milky way galaxy like they did the races in this one, to defeat their arch enemy, which is the Reapers.