smart on 08-May-2014 06:51:49 GMT about The Initial Gaia Source List (IGSL) (Smart, 2013)
Some objects do not have unrealistic magnitudes or nonsensical errors for a number of reasons:
All objects from the HIP, SPSS, SKY2000, LQRF and GEPC catalogs were included even if the magnitude information was not complete. In the case of OGLE/TYCHO2 objects the relations 10, 13, 16 and 17 are only valid to B-V or BT-VT of 2.5 so those objects were not assigned $R_F$ & $B_J$ magnitudes. Finally some objects just had unrealistic magnitudes so we also assigned NaN for that magnitude. The TYCHO2 catalog some times did not include the blue or red magnitudes and they were taken from HIPPARCOS, unfortunately in these cases the errors were not updated and they have remained zero as published in TYCHO2.
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View annotation on catalogue I/324