Hello there !
https://arxiv.org/pdf/2601.05486
I don’t know what to think about that.
Christophe
1 Like
Looks interesting… the experts on combining catalogs should comment perhaps.
Jim (DEY)
Non-expert here, but: the source paper is in serious need of some residuals plots. For instance, what are their recovered values for the HST CALSPEC standards observed as high-weight UBVRI standards (a few dozen stars). They adopted the Clem & Landolt CCD data with some field-by-field modifications, but what about the single-channel photoelectric data by Landolt? It would also be nice to know what the situation is for brighter stars, say V < 10 or 11. They seem also to have included APASS B,V data, which certainly has ‘issues’, but what do they look like?
In general I can certainly believe they have obtained few-millimag precision globally around the sky (Cousins and Landolt did so decades ago), but what are the accuracies like star-by-star? I bet it’s not so great.
\Brian
2 Likes