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Why doesn't Starry Night 8 Pro show all Sharpless objects?

I was going through Sky and Telescope looking for things to image and I found some great pictures of Sh2-273, 2-236 and 2-220

When I went to Starry Night 8 Pro for Mac and searched for Sh or Sh2, after a search for sharpness turned up nothing, I found a list that didn't include any of those three and also was missing a lot of other entries assuming the sharpness catalog doesn't have gaps.

When I go to the iTelescope website it knows about Sh2-273.  So at least that Sharpless object exists?

What's going on?

Thanks for any info.


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