Isn't 'planetary' stuff astronomy related? Certainly the first area in CPAN I'd think of looking would be in Astro. Putting it in the AnyData name space implies using the AnyData interface which could work, but isn't a particularly good match.

Indeed I have looked around. FITS is complicated enough that that it's not a wheel you'd want to reinvent for preference. However both the modules you allude to sit on top of the CFITSIO lib and I was looking for a pure Perl solution. Besides, I was a bit bothered by the CPAN test results for Astro::FITS::CFITSIO!