What's this ?
Could somebody tell me what this actually is?
I really don't have a clue
The long green stripe is a satellite trail 😃
Satellites sometimes pass overhead as the telescope is observing and reflect light in a streak across the image as they pass by. They
move quickly so their trails are always a single color: red, green, or blue. Sometimes you can classify the central galaxy, other times
there is no central galaxy because the computer got a bit confused.