> NOWADAYS IS HARDER TO SHOOT LONG INTEGRATION TIMES WITHOUT GETTING ANY SATELLITE PASSING TROUGH THE FRAME
Satellites, cosmic trash or UFOs, the moving spots are everywhere on the sky. Typical satellite behavior is to reflect sun light. It should be yellow or white and could fade and shine due to its rotation. At Saturday I was trying to make a stack of 50 frames of 30 seconds of Horse head nebula. I was surprised that during the 25 minutes integration I could count around 7 satellites passing trough the field of less then a degree. One of the objects was spinning very fast leaving a doted line on the frame. Below is a single frame with 3 satellites passing at the same time in front of the horse head nebula. The lines are not straight due to the wind vibrations. I assume that those are satellites but in fact as I am not sure those objects are officially UFOs :)
On the Photo: Horse head nebula and Flame nebula. Single frame 30s, Penatx k-5, ISO 51200. telescope SW200pds, F1000mm, D200mm
When we have a new newton telescope we shroud avoid touch the collimation of the secondary mirror as we may get into troubles.
You no more need large sensors and heavy equipment to do good general photos. The recent development of image sensors put silicon chip capabilities to it's limit by
Knowing what you are looking for is more then half way to achieving it. Breakthrough Listen is a SETI kind of project that listen for artificial signals from 1700 nearby stars up to 160 light years.
Some shots from Sofia. A very bright sky place. Zenith sky brightness info (2015): SQM 19.13 mag./arc sec2 Brightness 2.41 mcd/m2, Artif. bright. 2230 μcd/m2, Bortle class 6.