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In the Cape Catalogue, JH specifically used the term "trifid nebula" in sweep 793 (1837) so he clearly deserves credit for this nickname, but going back even earlier to his Slough Catalogue (1833) he describes "vL; trifid, three nebulae with a vacuity in the midst..."
As far as the Keyhole, I guess the jury is still out.
Here's another nickname sometimes attributed to JH -- "False Comet" for NGC 6231. Anyone know if this is true or what's the source?
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