To make a panorama viewable on the fulldome, tried the following method as given at this page as a shortcut instead of going through Blender or buying commercial software. At the bottom of this page, the type of fulldome image we need is shown. Basic method is simple - make the pan into a square image by resizing, then convert to polar co-ords. In Photoshop it is Filter -> Distort -> Polar Co-ordinates and in the Gimp it is Filters -> Distorts -> Polar Co-ordinates. This produces a fulldome master which I can later distort with tgawarper for display on our dome.
When I tried it with a pan of the SSSIHMS, a hi-res version of this picture, found that it looks squished on the dome - need original to be more squarish? Also, building is too far above the horizon. Need more sky and less ground. So, probably the solution would be to take a pan with the interesting parts near the bottom edge of the pic, and clone the sky to make it square instead of distorting it by simply resizing.