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And I downloaded them a while back and never thought to look there. :rolleyes: Lesson learned....

Mark--it does indeed seem that they're using a different designator, although why I'm not sure. I wondered if there was a conflict with a similar designator for a different type of object, but that...

Mark--you're absolutely right; that was a typo (and should've read "02h" as opposed to "20h".)

I think Al is right--mystery may be solved!

Thanks for the detective work!

Edit: What's ironic...

Thanks for the responses, guys.

Al--going to the big man himself! I'll try e-mailing Stoyan (ISDA author) to see what he can tell me about these clusters; if that doesn't work, then I'll give...

I'm currently compiling the open cluster section of a pretty huge database that contains every object in the Interstellarum atlas and cross lists it with all of the major paper atlases and references...