han.k on 22-May-2019 03:59:14 GMT about M 57
The reported M57 V-magnitude of 15.769 is clearly wrong. Most sources report a V-magnitude of around 8.8 including HyperLeda:
http://leda.univ-lyon1.fr/ledacat.cgi?o=m57
This error seems systematic for planetary nebula, so it looks like the data source is the problem. See my report about M97.
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