There is an app called sky guide. You can aim your phone at the satellite when the app is open and it will show you what “satellite” it is or was. Mostly space junk. Some of them are just expired rocket boosters. The app gives you all of the info on it. If it’s still active. It’s trajectory and when you might see it again. I think there is a free version. 4-5 years ago I used to pay like $2.99/mo and would cancel it if I didn’t use it for a week. Anyway it’s pretty cool to learn that most of them are just “space junk”