Object name: ARP146
Astro image tip. Avoid objects in the geostationary satellite belt! No one told me this so I had a night of better than average seeing so decided to try for Arp 146 which is too far south for me to image on an average night being about 6.5 degrees south and of small angular size. That put it at the northern edge of the geostationary satellite belt as seen from my latitude. Such communications satellites aren't really stationary in the sky. They make a small, about 1 degree high figure 8 pattern around their geostationary assigned position. From my location, Arp 146 is right at the northern edge of that pattern. So I ended up imaging lots of communications satellites, one obviously long dead. I removed them from the color frames as well as all but one luminosity frame. One frame only had 3 and I decided to leave them in to give a flavor of what I had to deal with. There were 29 satellite trails in total with 5 in one blue frame. Notice the angled trails. They are decommissioned geostationary satellites. When they are about to run out of station-keeping fuel -- the orbit is unstable and the figure 8 pattern grows with time so fuel is needed to keep the bird within its prescribed spot so fixed dishes still see it -- it is moved several hundred miles higher to get it out of the way. The last of the fuel is used for this. With time the orbit is altered by the nonround earth and pull of the moon and sun until it is somewhat inclined to the equator. That is why I can tell it is a deactivated satellite. Also one is using spin stabilization. That's no longer used as far as I can determine. This causes it to blink as its reflectivity changes with its spin. It doesn't move across the entire image as I terminated the exposure before it had moved all the way across the image. You will see places where the trails fade. This is due to small clouds passing by. They didn't totally block the light but did dim it some for a few seconds. The entire image was dimmed but that isn't seen except by moving objects.