han.k on 22-May-2019 03:53:31 GMT about M 97
The reported M97 V-magnitude of 15.777 is clearly wrong. Most sources report a V-magnitude of around 9.9 including HyperLeda:
http://leda.univ-lyon1.fr/ledacat.cgi?o=m97
This error seems systematic for planetary nebula, so it looks like the data source is the problem. E.g. have a look to the V-magnitude of M57, reported as 15.769 rather then 8.8 by Hyperleda. See http://leda.univ-lyon1.fr/ledacat.cgi?o=m57
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