Wilfried on 11-Oct-2016 11:31:06 GMT about I/330
During the research for a JDSO report on I/330 objects (http://www.jdso.org/volume12/number6/Knapp_589_594.pdf) I found that I/330 contains to a good part objects already included in the WDS catalog. When I contacted the author of the catalog with this question he stated “I think perhaps you have misunderstood the scope of the listing - nowhere does it say they are all new discoveries. In fact it quite clearly says they are not”.
This is in contradiction to the printed version of this catalog (at Amazon.com) where he describes the last step of his research “Cross reference the results obtained with the latest on-line version of the WDS catalogue so that all the known double stars could be removed from the output file leaving only the new discoveries to be presented in this paper”.
What remains is that many I/330 objects are in contradiction to the title of the catalog not "Binary star discoveries".
URAT1 as base for the I/330 content includes proper motion data declared as preliminary from the authors (data is calculated on base of comparison with 2MASS positions und generally very precise but many objects with very fast pm are missing). Preliminary is especially the URAT1 pm error data given as these values are calculated on base of an on the very optimistic side assumed average 2MASS position error - this means that the URAT1 contamination rate in pm error values is quite high. As I/330 simply repeats the URAT1 data this is then the case also here
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View annotation on null I/330