Someone, usually a girl, who does everything she can to be exactly like the popular girl. Normally guys will think she is hot and popular, but really she's just a fake. Once you can identify a sattelite as what she truly is, it really seems quite pathetic.
Dude 1: Man, Carla sure is hot.
Dude 2: Nah man, can't you tell? She's not even a real person, she's just Jenny's sattelite.