What did I see

I am new to this hobby and ng.
Tonight I was looking at Andromeda with my etx at 0240 ct (gmt -5) when I
saw something move accross my line of sight bearing due north. I was able to
track it and followed it until the horizon. this took about 60 seconds from
Andromeda to my horizon at about 10 degrees elevation. It was not visible
with the naked eye. I did not think it was possible to see satellites in the
middle of the night, this was a good 3 hours before sunrise. Any feedback
would be appreciated, it gave me quite a thrill. Now my curiosity is peaked.