I was impressed when I read the New York Times article about the handful hobbyists spend hours detecting satellites and they re able to identify many satellites. They even calculate the speed of each satellite orbiting around Earth.
The article mentioned that 328 satellites have come down in the past five years. I wonder if the figure is accurate because that's awful a lot of satellites orbiting around Earth.
For further reading, click on the link below.
Satellite Spotters Glimpse Secrets, and Tell Them