Perhaps look into
Sequator. I haven't used it much but the website claims this:
Quote:
Sequator is a free software which can track stars on multiple images, align stars and stack them.
If you don't have an equatorial mount, by stacking non-blur star images in short-time exposures, the result will be almost similar to long-exposure on an equatorial mount. However, Sequator can control the exposure properly by auto-brightness or HDR-mode output, in 16-bit TIFF for further post processing. Additionally average random noises, rather than over-exposed on a physical equatorial mount.
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