Best deep-sky targets in September

How this list is made

For each of the 272 targets in the target guide, the time spent above 30° while the sun is more than 18° below the horizon is worked out for the night of September 15, at 45° N and 35° S. A target is listed if it gets at least an hour and either has at least 80% of its best month's hours, or is up for at least 75% of the longest time any target gets that night. The first rule keeps low targets such as the Orion Nebula from northern sites; the second keeps summer targets whose best month is later only because the nights get longer.

Named and brighter objects are listed first. "Highest" is the altitude at which the target crosses the meridian, which may fall outside the dark hours. The moon is not counted here. The stars rise about four minutes earlier each night, so on the 1st each target reaches a given spot in the sky about an hour later in the night than on the 15th, and at the end of the month about an hour earlier. For your own location and date, open the imaging planner.