Interesting Steve, thanks! And that brings up the question - is describing something as "trifid" shaped the same as naming it the Trifid Nebula? If John Herschel did describe the Argo object as "keyhole" shaped, is that the same as naming it the Keyhole Nebula? Is that two questions? Oops, three...
Steve, do you know if JH was a 'namer'? Did he routinely give celestial objects common names? (so many questions, sorry...
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Cheers