I have the images. There are maybe 6 stars visible making at very difficult. The internal solver needs about 30 stars to work. My astrometry.net installation can't solve it but that's because the FOV is very small. The webpage nova.astrometry.net finds this for one image:
http://nova.astrometry.net/user_images/ ... #annotated
Center (RA, Dec): (323.033, 48.413)
Center (RA, hms): 21h 32m 07.958s
Center (Dec, dms): +48° 24' 45.407"
Size: 11.4 x 7.68 arcmin
Radius: 0.115 deg
Pixel scale: 0.222 arcsec/pixel
For the small 0.115 deg FOV, I haven't download the index files, probably a gigabyte or so. Can you send me the .wcs files your astrometry.net has created after finding the solution. That makes it easier
The pixel scale is also very small. 0.222 arcsec/pixel so highly over-sampled. The typical seeing at most locations is 3 or 4 arc seconds. The 0.222 arcsec/pixel is way low or in other words the magnification is too high. It also explains why only a few stars are visible. A pixel scale of 1.5 arc seconds would be much better and more sensitive to fotons.
For these images to stack it is better to use manual alignment.
Any reason for this small field/high magnification?