I've always updated my image of Gyulbudaghian's Nebula, a variable nebula, about once a year. I took this year's version in July earlier than usual hoping to try again in a few months. That time came November 8. Unfortunately conditions so far this month have been very bad. Fog and haze moved in even as the first frame was starting. I ended up taking 8 luminance frames none of which were very good but combining all 8 I got something kind of useful. There were nasty fog halos around bright stars I sort of dealt with. Removing them but not the nebula behind them was quite a challenge. Color data was very poor due to the fog. I about gave up on processing this but finally managed to get something useful. I could try again once the moon is out of the way. If so that would give a very short term view of how it changes. Looking at the November 8 image it looks much like it did a year ago rather than as it did in July. So it may very well show variations in only two or three weeks time. If the weather ever cooperates maybe I can find out.
For more on this see my November 4 post of my July image.
http://www.spacebanter.com/showthread.php?t=212916
14" LX200R @ f/10, L=8x10' RGB=2x10', STL-11000XM, Paramount ME
Rick