epecontal on 27-May-2014 12:13:05 GMT about NOMAD Catalog (Zacharias+ 2005)
I have met a problem using the NOMAD catalog: The B magnitudes from the YB6 catalog appear to be wrong by at least 4 magnitudes in some fields. For instance, in the field centered at:
ra2000=18:19:02.71 de2000=-32:12:57.9
radius 7.5 arcmin
The stars with magnitude from YB6 have a magnitude around 12. If you draw an histogram of all the magnitudes in this field, there is a separated class at magnitude 12 corresponding to these stars. I don't know where this artefact comes from, but it is there...
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View annotation on catalogue I/297