2019-10-01, 02:35 PM
I found the problem and solved it.
Systems #2 and #3 were at a location with a sky of 21.9 mag/arcsec2 and system #1 was at a location with a sky of 19.6 mag/arcsec2. This difference in sky brightness would have a significant effect on SNR calculations.
Systems #2 and #3 were at a location with a sky of 21.9 mag/arcsec2 and system #1 was at a location with a sky of 19.6 mag/arcsec2. This difference in sky brightness would have a significant effect on SNR calculations.