This planner shows the possible imaging times for the specified DSO from my backyard. It incorporates hard-coded values for my location and horizon so it is not a general tool. However, you are free to copy/modify for your own use.
Location: Edison, NJ (Lat 40.5187N, Long -74.4121W)
Limit #1: 145-190° AZ, 30°+ ALT
Limit #2: 190-230° AZ, 65°+ ALT
Limit #3: 230-280° AZ, 30°+ ALT
Limit #4: 280-10° AZ, 60°+ ALT