I've been working on the Horsehead nebula recently and I was flicking through data taken a month ago and another set taken over the last few days and noticed a new star and a brightening star.
In the first two images you can see there is a star that didn't exist a month ago but does now. It's in the same position on Sunday night and Tuesday night so it isn't a transient object. If I stack last months images and this months it does become more apparent. There is also another star near the bright star in the SE corner than has a brightening and dimming star. It is apparent over a month long period but doesn't change over several days.
The next two show a star that has a significant brightness change. This star along with another one I found may be a Cepheid Variable. I haven't followed up on this particular star but I found another one not shown here that doesn't change over the course of a night but does over two. It shows virtually no change from Nov 27th to Dec 22nd but a brightness difference from Dec 22nd to Dec 24th.
I may have to revisit this region another night to see if there are any other developments!
