Quote:
Originally Posted by Garyh
I have had only one object that wasn`t on the list and it`s a IC 2169 as I was unable to put the 9 in the sequence?
Not sure what was going on there? Have read there are some duplicate objects that were removed in this catalog?
Gary
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Thanks for the post.
The Messier, NGC and IC catalogs are all "historical catalogs" and contain many
historical errors and puzzles for those who have come after to ponder. Some of
these have been resolved by various practitioners over time and some will for ever
remain a mystery. For example, some errors can be accounted for as a simple slip
of the quill pen, perhaps not entering a minus sign for a Dec. Other well meaning
practitioners who attempted to revise these historical catalogs unfortunately added
additional errors that others that followed would then have to correct.
When we compiled the catalogs we made every effort to use the best data
available to us and that often meant independently scrutinizing survey plates
or going out and trying to observe an object ourselves. For example, I spent
a good part of a year attempting to independently correct the NGC catalog.
IC 2169 is a duplicate object with IC 447 and the Argo Navis IC catalog was compiled
in such a way as to intentionally avoid duplicate entries appearing.
We like to keep the catalogs as correct as possible.
If an Argo Navis user ever comes across an error in a catalog, please let us
know by email along with a link to some supporting reference such as survey
data or images and we will investigate and correct it.
Best Regards
Gary Kopff
Managing Director
Wildcard Innovations Pty. Ltd.
20 Kilmory Place, Mount Kuring-Gai
NSW. 2080. Australia
Phone +61-2-9457-9049
Fax +61-2-9457-9593
sales@wildcard-innovations.com.au
http://www.wildcard-innovations.com.au