Let’s talk about Stellar Catalogues

Version 1.4.3 is now on its way. No sensational innovations, some aesthetic-functional changes and corrections of small bugs that still were around.
Let’s talk about star catalogs for a moment: UrukFSP uses a merge between the XHIP catalog (the most modern version of the Hipparcos catalog) and the DR3 release of the Gaia Catalog, up to mag 12, approximately. Gaia is not perfect, a good number of radial speeds are still missing and I had to download several catalogs onto my server to be able to obtain the missing information via SQL queries,
Still speaking of Gaia DR3, it must be said that out of approximately 2 billion stellar objects, 344 million are without proper motion and parallax.
In my subset downloaded locally (about 33 million stars) as many as 287908 have negative parallax (therefore a measurement error).
UrukFSP uses an even smaller subset, just over 2 million GAIA stars, and still 2713 are without a parallax value or with negative (incorrect) parallax.
The long work of cleaning and merging the UrukFSP stellar archive led me to have a residue of only a hundred stars with non-correctable negative parallax. This means that the calculation of the proper motion of these stars over the millennia will be less precise than the others, because a measurement of the Earth-Star distance is missing. However, these are not stars of archaeoastronomical use and this lack of information is reported in the star file as N/A (not acknowledged).
In short, the moral of all this is that you cannot take the star archives and throw them into an application as they are. There are certainly errors, and patient work must be done to clean the data to have the most reliable source possible.