Technically yes. You'll find it easier in images with stars than you will for planets. This will attempt to remove both rotation and slight focal length differences.
The following assumes the source image is RGB. If it is still separate channels, skip the first step.
-Split the image into channels (channel pallete "split")
-Save each channel as grayscale, using an appropriate name
-close all images
-Under File, Automate, Photomerge. Select your R G and B images. Turn off blend images.
-Once combined, promote the image to RGB. Don't merge layers when prompted.
-In the layers palette, select the red layer. Adjust curves, set green and blue to 0%. Set the layer blend mode to "lighten".
-In the layers palette, select the green layer. Adjust curves, set red and blue to 0%. Set the layer blend mode to "lighten".
-In the layers palette, select the blue layer. Adjust curves, set red and green to 0%. Set the layer blend mode to "lighten".
If the alignment is still out, select the offending layer and use "free transform" to rotate and/or shift it by arbitrary amounts. Unfortunately you will be limited to 1/10th of a degree for rotation, as it rounds.
Edit: I played with this a bit, and was able to get rotation accurate, but each layer tended to be off by a few pixels. It was nothing that the move tool couldn't fix.
